United States Rancho Cucamonga, California
Long Range Weather Forecast

Helping You Avoid Bad Weather. 30 days and beyond.

Rancho Cucamonga, January 2026 Weather Forecast: A Day-by-Day Calendar View Rancho Cucamonga Weather Outlook: Detailed January 2026 Calendar Sun Mon Tue Wed Thu Fri Sat 1 63°F 37°F 17°C 3°C 33% Rancho Cucamonga weather forecast for Jan 1, 2026: 33% Rain Chance, Highs/Lows 63°F to ?63°F Rancho Cucamonga weather forecast for Jan 1, 2026: 33% Rain Chance, Highs/Lows 17°C to ?17°C 2 65°F 37°F 18°C 3°C 24% Rancho Cucamonga weather forecast for Jan 2, 2026: 24% Rain Chance, Highs/Lows 65°F to ?65°F Rancho Cucamonga weather forecast for Jan 2, 2026: 24% Rain Chance, Highs/Lows 18°C to ?18°C 3 64°F 38°F 18°C 3°C 24% Rancho Cucamonga weather forecast for Jan 3, 2026: 24% Rain Chance, Highs/Lows 64°F to ?64°F Rancho Cucamonga weather forecast for Jan 3, 2026: 24% Rain Chance, Highs/Lows 18°C to ?18°C 4 63°F 38°F 17°C 3°C 20% Rancho Cucamonga weather forecast for Jan 4, 2026: 20% Rain Chance, Highs/Lows 63°F to ?63°F Rancho Cucamonga weather forecast for Jan 4, 2026: 20% Rain Chance, Highs/Lows 17°C to ?17°C 5 62°F 37°F 17°C 3°C 34% Rancho Cucamonga weather forecast for Jan 5, 2026: 34% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 5, 2026: 34% Rain Chance, Highs/Lows 17°C to ?17°C 6 60°F 37°F 16°C 3°C 38% Rancho Cucamonga weather forecast for Jan 6, 2026: 38% Rain Chance, Highs/Lows 60°F to ?60°F Rancho Cucamonga weather forecast for Jan 6, 2026: 38% Rain Chance, Highs/Lows 16°C to ?16°C 7 59°F 38°F 15°C 3°C 54% Rancho Cucamonga weather forecast for Jan 7, 2026: 54% Rain Chance, Highs/Lows 59°F to ?59°F Rancho Cucamonga weather forecast for Jan 7, 2026: 54% Rain Chance, Highs/Lows 15°C to ?15°C 8 60°F 38°F 16°C 3°C 71% Rancho Cucamonga weather forecast for Jan 8, 2026: 71% Rain Chance, Highs/Lows 60°F to ?60°F Rancho Cucamonga weather forecast for Jan 8, 2026: 71% Rain Chance, Highs/Lows 16°C to ?16°C 9 61°F 39°F 16°C 4°C 52% Rancho Cucamonga weather forecast for Jan 9, 2026: 52% Rain Chance, Highs/Lows 61°F to ?61°F Rancho Cucamonga weather forecast for Jan 9, 2026: 52% Rain Chance, Highs/Lows 16°C to ?16°C 10 62°F 38°F 17°C 3°C 44% Rancho Cucamonga weather forecast for Jan 10, 2026: 44% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 10, 2026: 44% Rain Chance, Highs/Lows 17°C to ?17°C 11 61°F 38°F 16°C 3°C 49% Rancho Cucamonga weather forecast for Jan 11, 2026: 49% Rain Chance, Highs/Lows 61°F to ?61°F Rancho Cucamonga weather forecast for Jan 11, 2026: 49% Rain Chance, Highs/Lows 16°C to ?16°C 12 62°F 39°F 17°C 4°C 51% Rancho Cucamonga weather forecast for Jan 12, 2026: 51% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 12, 2026: 51% Rain Chance, Highs/Lows 17°C to ?17°C 13 61°F 38°F 16°C 3°C 38% Rancho Cucamonga weather forecast for Jan 13, 2026: 38% Rain Chance, Highs/Lows 61°F to ?61°F Rancho Cucamonga weather forecast for Jan 13, 2026: 38% Rain Chance, Highs/Lows 16°C to ?16°C 14 60°F 37°F 16°C 3°C 20% Rancho Cucamonga weather forecast for Jan 14, 2026: 20% Rain Chance, Highs/Lows 60°F to ?60°F Rancho Cucamonga weather forecast for Jan 14, 2026: 20% Rain Chance, Highs/Lows 16°C to ?16°C 15 59°F 36°F 15°C 2°C 06% Rancho Cucamonga weather forecast for Jan 15, 2026: 6% Rain Chance, Highs/Lows 59°F to ?59°F Rancho Cucamonga weather forecast for Jan 15, 2026: 6% Rain Chance, Highs/Lows 15°C to ?15°C 16 58°F 35°F 14°C 2°C 22% Rancho Cucamonga weather forecast for Jan 16, 2026: 22% Rain Chance, Highs/Lows 58°F to ?58°F Rancho Cucamonga weather forecast for Jan 16, 2026: 22% Rain Chance, Highs/Lows 14°C to ?14°C 17 58°F 35°F 14°C 2°C 27% Rancho Cucamonga weather forecast for Jan 17, 2026: 27% Rain Chance, Highs/Lows 58°F to ?58°F Rancho Cucamonga weather forecast for Jan 17, 2026: 27% Rain Chance, Highs/Lows 14°C to ?14°C 18 61°F 35°F 16°C 2°C 35% Rancho Cucamonga weather forecast for Jan 18, 2026: 35% Rain Chance, Highs/Lows 61°F to ?61°F Rancho Cucamonga weather forecast for Jan 18, 2026: 35% Rain Chance, Highs/Lows 16°C to ?16°C 19 62°F 36°F 17°C 2°C 40% Rancho Cucamonga weather forecast for Jan 19, 2026: 40% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 19, 2026: 40% Rain Chance, Highs/Lows 17°C to ?17°C 20 62°F 37°F 17°C 3°C 54% Rancho Cucamonga weather forecast for Jan 20, 2026: 54% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 20, 2026: 54% Rain Chance, Highs/Lows 17°C to ?17°C 21 63°F 38°F 17°C 3°C 41% Rancho Cucamonga weather forecast for Jan 21, 2026: 41% Rain Chance, Highs/Lows 63°F to ?63°F Rancho Cucamonga weather forecast for Jan 21, 2026: 41% Rain Chance, Highs/Lows 17°C to ?17°C 22 63°F 39°F 17°C 4°C 29% Rancho Cucamonga weather forecast for Jan 22, 2026: 29% Rain Chance, Highs/Lows 63°F to ?63°F Rancho Cucamonga weather forecast for Jan 22, 2026: 29% Rain Chance, Highs/Lows 17°C to ?17°C 23 64°F 38°F 18°C 3°C 34% Rancho Cucamonga weather forecast for Jan 23, 2026: 34% Rain Chance, Highs/Lows 64°F to ?64°F Rancho Cucamonga weather forecast for Jan 23, 2026: 34% Rain Chance, Highs/Lows 18°C to ?18°C 24 62°F 38°F 17°C 3°C 36% Rancho Cucamonga weather forecast for Jan 24, 2026: 36% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 24, 2026: 36% Rain Chance, Highs/Lows 17°C to ?17°C 25 63°F 38°F 17°C 3°C 42% Rancho Cucamonga weather forecast for Jan 25, 2026: 42% Rain Chance, Highs/Lows 63°F to ?63°F Rancho Cucamonga weather forecast for Jan 25, 2026: 42% Rain Chance, Highs/Lows 17°C to ?17°C 26 62°F 40°F 17°C 4°C 31% Rancho Cucamonga weather forecast for Jan 26, 2026: 31% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 26, 2026: 31% Rain Chance, Highs/Lows 17°C to ?17°C 27 63°F 38°F 17°C 3°C 33% Rancho Cucamonga weather forecast for Jan 27, 2026: 33% Rain Chance, Highs/Lows 63°F to ?63°F Rancho Cucamonga weather forecast for Jan 27, 2026: 33% Rain Chance, Highs/Lows 17°C to ?17°C 28 62°F 39°F 17°C 4°C 21% Rancho Cucamonga weather forecast for Jan 28, 2026: 21% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 28, 2026: 21% Rain Chance, Highs/Lows 17°C to ?17°C 29 61°F 37°F 16°C 3°C 17% Rancho Cucamonga weather forecast for Jan 29, 2026: 17% Rain Chance, Highs/Lows 61°F to ?61°F Rancho Cucamonga weather forecast for Jan 29, 2026: 17% Rain Chance, Highs/Lows 16°C to ?16°C 30 62°F 38°F 17°C 3°C 29% Rancho Cucamonga weather forecast for Jan 30, 2026: 29% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 30, 2026: 29% Rain Chance, Highs/Lows 17°C to ?17°C 31 62°F 37°F 17°C 3°C 20% Rancho Cucamonga weather forecast for Jan 31, 2026: 20% Rain Chance, Highs/Lows 62°F to ?62°F Rancho Cucamonga weather forecast for Jan 31, 2026: 20% Rain Chance, Highs/Lows 17°C to ?17°C

Weather Forecast Legend

WeatherTAB helps you plan activities on days with the least risk of rain.
Low risk of rain/snow.
Transition Day – Start or End of a Risky Period
Medium risk of rain/snow.
High risk of rain/snow.
%
Forecast risk of rain/snow.
Rancho Cucamonga Weather Forecast for Jan 2026 - Risk of Rain Graph ) Rancho Cucamonga Weather Forecast for Jan 2026 - Risk of Rain Graph 90 80 70 60 50 40 30 20 10 Jan 1: Precipitation Risk Forecast - 33% risk of rain/snow. /n1 Th Jan 2: Precipitation Risk Forecast - 24% risk of rain/snow. /n2 F Jan 3: Precipitation Risk Forecast - 24% risk of rain/snow. /n3 S Jan 4: Precipitation Risk Forecast - 20% risk of rain/snow. /n4 Sn Jan 5: Precipitation Risk Forecast - 34% risk of rain/snow. /n5 M Jan 6: Precipitation Risk Forecast - 38% risk of rain/snow. /n6 T Jan 7: Precipitation Risk Forecast - 54% risk of rain/snow. /n7 W Jan 8: Precipitation Risk Forecast - 71% risk of rain/snow. /n8 Th Jan 9: Precipitation Risk Forecast - 52% risk of rain/snow. /n9 F Jan 10: Precipitation Risk Forecast - 44% risk of rain/snow. /n10 S Jan 11: Precipitation Risk Forecast - 49% risk of rain/snow. /n11 Sn Jan 12: Precipitation Risk Forecast - 51% risk of rain/snow. /n12 M Jan 13: Precipitation Risk Forecast - 38% risk of rain/snow. /n13 T Jan 14: Precipitation Risk Forecast - 20% risk of rain/snow. /n14 W Jan 15: Precipitation Risk Forecast - 06% risk of rain/snow. /n15 Th Jan 16: Precipitation Risk Forecast - 22% risk of rain/snow. /n16 F Jan 17: Precipitation Risk Forecast - 27% risk of rain/snow. /n17 S Jan 18: Precipitation Risk Forecast - 35% risk of rain/snow. /n18 Sn Jan 19: Precipitation Risk Forecast - 40% risk of rain/snow. /n19 M Jan 20: Precipitation Risk Forecast - 54% risk of rain/snow. /n20 T Jan 21: Precipitation Risk Forecast - 41% risk of rain/snow. /n21 W Jan 22: Precipitation Risk Forecast - 29% risk of rain/snow. /n22 Th Jan 23: Precipitation Risk Forecast - 34% risk of rain/snow. /n23 F Jan 24: Precipitation Risk Forecast - 36% risk of rain/snow. /n24 S Jan 25: Precipitation Risk Forecast - 42% risk of rain/snow. /n25 Sn Jan 26: Precipitation Risk Forecast - 31% risk of rain/snow. /n26 M Jan 27: Precipitation Risk Forecast - 33% risk of rain/snow. /n27 T Jan 28: Precipitation Risk Forecast - 21% risk of rain/snow. /n28 W Jan 29: Precipitation Risk Forecast - 17% risk of rain/snow. /n29 Th Jan 30: Precipitation Risk Forecast - 29% risk of rain/snow. /n30 F Jan 31: Precipitation Risk Forecast - 20% risk of rain/snow. /n31 S

Rain Risk Graph: Monthly Overview. Bar heights indicate rain risk percentages. Yellow bars mark low-risk days, while black and grey bars signal higher risks. Grey-yellow bars act as buffers, advising to keep at least one day clear from the riskier grey and black days, guiding safer outdoor planning. Note: This graph suggests potential risk, not guaranteed rainfall; expect most rain, if any, on days marked in grey and black.

Rancho Cucamonga, Jan 2026: Daily High Temperature Forecast Rancho Cucamonga High Temperature Trends for January 2026 63 12 62 12 61 12 60 12 59 12 58 12 57 12 56 12 55 12 Rancho Cucamonga, Jan 1: High Temp of 63°F /nRancho Cucamonga, Jan 1: High Temp of ?°C /n1 Th Rancho Cucamonga, Jan 2: High Temp of 65°F /nRancho Cucamonga, Jan 2: High Temp of ?°C /n2 F Rancho Cucamonga, Jan 3: High Temp of 64°F /nRancho Cucamonga, Jan 3: High Temp of ?°C /n3 S Rancho Cucamonga, Jan 4: High Temp of 63°F /nRancho Cucamonga, Jan 4: High Temp of ?°C /n4 Sn Rancho Cucamonga, Jan 5: High Temp of 62°F /nRancho Cucamonga, Jan 5: High Temp of ?°C /n5 M Rancho Cucamonga, Jan 6: High Temp of 60°F /nRancho Cucamonga, Jan 6: High Temp of ?°C /n6 T Rancho Cucamonga, Jan 7: High Temp of 59°F /nRancho Cucamonga, Jan 7: High Temp of ?°C /n7 W Rancho Cucamonga, Jan 8: High Temp of 60°F /nRancho Cucamonga, Jan 8: High Temp of ?°C /n8 Th Rancho Cucamonga, Jan 9: High Temp of 61°F /nRancho Cucamonga, Jan 9: High Temp of ?°C /n9 F Rancho Cucamonga, Jan 10: High Temp of 62°F /nRancho Cucamonga, Jan 10: High Temp of ?°C /n10 S Rancho Cucamonga, Jan 11: High Temp of 61°F /nRancho Cucamonga, Jan 11: High Temp of ?°C /n11 Sn Rancho Cucamonga, Jan 12: High Temp of 62°F /nRancho Cucamonga, Jan 12: High Temp of ?°C /n12 M Rancho Cucamonga, Jan 13: High Temp of 61°F /nRancho Cucamonga, Jan 13: High Temp of ?°C /n13 T Rancho Cucamonga, Jan 14: High Temp of 60°F /nRancho Cucamonga, Jan 14: High Temp of ?°C /n14 W Rancho Cucamonga, Jan 15: High Temp of 59°F /nRancho Cucamonga, Jan 15: High Temp of ?°C /n15 Th Rancho Cucamonga, Jan 16: High Temp of 58°F /nRancho Cucamonga, Jan 16: High Temp of ?°C /n16 F Rancho Cucamonga, Jan 17: High Temp of 58°F /nRancho Cucamonga, Jan 17: High Temp of ?°C /n17 S Rancho Cucamonga, Jan 18: High Temp of 61°F /nRancho Cucamonga, Jan 18: High Temp of ?°C /n18 Sn Rancho Cucamonga, Jan 19: High Temp of 62°F /nRancho Cucamonga, Jan 19: High Temp of ?°C /n19 M Rancho Cucamonga, Jan 20: High Temp of 62°F /nRancho Cucamonga, Jan 20: High Temp of ?°C /n20 T Rancho Cucamonga, Jan 21: High Temp of 63°F /nRancho Cucamonga, Jan 21: High Temp of ?°C /n21 W Rancho Cucamonga, Jan 22: High Temp of 63°F /nRancho Cucamonga, Jan 22: High Temp of ?°C /n22 Th Rancho Cucamonga, Jan 23: High Temp of 64°F /nRancho Cucamonga, Jan 23: High Temp of ?°C /n23 F Rancho Cucamonga, Jan 24: High Temp of 62°F /nRancho Cucamonga, Jan 24: High Temp of ?°C /n24 S Rancho Cucamonga, Jan 25: High Temp of 63°F /nRancho Cucamonga, Jan 25: High Temp of ?°C /n25 Sn Rancho Cucamonga, Jan 26: High Temp of 62°F /nRancho Cucamonga, Jan 26: High Temp of ?°C /n26 M Rancho Cucamonga, Jan 27: High Temp of 63°F /nRancho Cucamonga, Jan 27: High Temp of ?°C /n27 T Rancho Cucamonga, Jan 28: High Temp of 62°F /nRancho Cucamonga, Jan 28: High Temp of ?°C /n28 W Rancho Cucamonga, Jan 29: High Temp of 61°F /nRancho Cucamonga, Jan 29: High Temp of ?°C /n29 Th Rancho Cucamonga, Jan 30: High Temp of 62°F /nRancho Cucamonga, Jan 30: High Temp of ?°C /n30 F Rancho Cucamonga, Jan 31: High Temp of 62°F /nRancho Cucamonga, Jan 31: High Temp of ?°C /n31 S

High Temperature Graph: Tracks daily forecasted highs. Vertical bars on each day highlight forecast variability, emphasizing trend analysis over precise predictions.

Rancho Cucamonga, Jan 2026: Daily Average Temperature Forecast Rancho Cucamonga Average Temperature Trends for January 2026 51 6 50 6 49 6 48 6 47 6 46 6 45 6 44 6 43 6 Rancho Cucamonga, Jan 1: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 1: Forecasted Average Temp of 10°C /n1 Th Rancho Cucamonga, Jan 2: Forecasted Average Temp of 51°F /nRancho Cucamonga, Jan 2: Forecasted Average Temp of 10°C /n2 F Rancho Cucamonga, Jan 3: Forecasted Average Temp of 51°F /nRancho Cucamonga, Jan 3: Forecasted Average Temp of 10°C /n3 S Rancho Cucamonga, Jan 4: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 4: Forecasted Average Temp of 10°C /n4 Sn Rancho Cucamonga, Jan 5: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 5: Forecasted Average Temp of 10°C /n5 M Rancho Cucamonga, Jan 6: Forecasted Average Temp of 48°F /nRancho Cucamonga, Jan 6: Forecasted Average Temp of 9°C /n6 T Rancho Cucamonga, Jan 7: Forecasted Average Temp of 48°F /nRancho Cucamonga, Jan 7: Forecasted Average Temp of 9°C /n7 W Rancho Cucamonga, Jan 8: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 8: Forecasted Average Temp of 9°C /n8 Th Rancho Cucamonga, Jan 9: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 9: Forecasted Average Temp of 10°C /n9 F Rancho Cucamonga, Jan 10: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 10: Forecasted Average Temp of 10°C /n10 S Rancho Cucamonga, Jan 11: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 11: Forecasted Average Temp of 9°C /n11 Sn Rancho Cucamonga, Jan 12: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 12: Forecasted Average Temp of 10°C /n12 M Rancho Cucamonga, Jan 13: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 13: Forecasted Average Temp of 9°C /n13 T Rancho Cucamonga, Jan 14: Forecasted Average Temp of 48°F /nRancho Cucamonga, Jan 14: Forecasted Average Temp of 9°C /n14 W Rancho Cucamonga, Jan 15: Forecasted Average Temp of 47°F /nRancho Cucamonga, Jan 15: Forecasted Average Temp of 8°C /n15 Th Rancho Cucamonga, Jan 16: Forecasted Average Temp of 46°F /nRancho Cucamonga, Jan 16: Forecasted Average Temp of 8°C /n16 F Rancho Cucamonga, Jan 17: Forecasted Average Temp of 46°F /nRancho Cucamonga, Jan 17: Forecasted Average Temp of 8°C /n17 S Rancho Cucamonga, Jan 18: Forecasted Average Temp of 48°F /nRancho Cucamonga, Jan 18: Forecasted Average Temp of 9°C /n18 Sn Rancho Cucamonga, Jan 19: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 19: Forecasted Average Temp of 9°C /n19 M Rancho Cucamonga, Jan 20: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 20: Forecasted Average Temp of 10°C /n20 T Rancho Cucamonga, Jan 21: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 21: Forecasted Average Temp of 10°C /n21 W Rancho Cucamonga, Jan 22: Forecasted Average Temp of 51°F /nRancho Cucamonga, Jan 22: Forecasted Average Temp of 10°C /n22 Th Rancho Cucamonga, Jan 23: Forecasted Average Temp of 51°F /nRancho Cucamonga, Jan 23: Forecasted Average Temp of 10°C /n23 F Rancho Cucamonga, Jan 24: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 24: Forecasted Average Temp of 10°C /n24 S Rancho Cucamonga, Jan 25: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 25: Forecasted Average Temp of 10°C /n25 Sn Rancho Cucamonga, Jan 26: Forecasted Average Temp of 51°F /nRancho Cucamonga, Jan 26: Forecasted Average Temp of 10°C /n26 M Rancho Cucamonga, Jan 27: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 27: Forecasted Average Temp of 10°C /n27 T Rancho Cucamonga, Jan 28: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 28: Forecasted Average Temp of 10°C /n28 W Rancho Cucamonga, Jan 29: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 29: Forecasted Average Temp of 9°C /n29 Th Rancho Cucamonga, Jan 30: Forecasted Average Temp of 50°F /nRancho Cucamonga, Jan 30: Forecasted Average Temp of 10°C /n30 F Rancho Cucamonga, Jan 31: Forecasted Average Temp of 49°F /nRancho Cucamonga, Jan 31: Forecasted Average Temp of 10°C /n31 S

Average Temperature Graph: Illustrates daily average temperatures. Each point's vertical bar underscores the forecast's potential fluctuation, encouraging trend recognition throughout the month.

Rancho Cucamonga, Jan 2026: Daily Low Temperature Forecast Rancho Cucamonga Low Temperature Trends for January 2026 40 0 39 0 38 0 37 0 36 0 35 0 34 0 33 0 32 0 Rancho Cucamonga, January 1: Low Temp of 37°F /nRancho Cucamonga, January 1: Low Temp of 3°C /n1 Th Rancho Cucamonga, January 2: Low Temp of 37°F /nRancho Cucamonga, January 2: Low Temp of 3°C /n2 F Rancho Cucamonga, January 3: Low Temp of 38°F /nRancho Cucamonga, January 3: Low Temp of 3°C /n3 S Rancho Cucamonga, January 4: Low Temp of 38°F /nRancho Cucamonga, January 4: Low Temp of 3°C /n4 Sn Rancho Cucamonga, January 5: Low Temp of 37°F /nRancho Cucamonga, January 5: Low Temp of 3°C /n5 M Rancho Cucamonga, January 6: Low Temp of 37°F /nRancho Cucamonga, January 6: Low Temp of 3°C /n6 T Rancho Cucamonga, January 7: Low Temp of 38°F /nRancho Cucamonga, January 7: Low Temp of 3°C /n7 W Rancho Cucamonga, January 8: Low Temp of 38°F /nRancho Cucamonga, January 8: Low Temp of 3°C /n8 Th Rancho Cucamonga, January 9: Low Temp of 39°F /nRancho Cucamonga, January 9: Low Temp of 4°C /n9 F Rancho Cucamonga, January 10: Low Temp of 38°F /nRancho Cucamonga, January 10: Low Temp of 3°C /n10 S Rancho Cucamonga, January 11: Low Temp of 38°F /nRancho Cucamonga, January 11: Low Temp of 3°C /n11 Sn Rancho Cucamonga, January 12: Low Temp of 39°F /nRancho Cucamonga, January 12: Low Temp of 4°C /n12 M Rancho Cucamonga, January 13: Low Temp of 38°F /nRancho Cucamonga, January 13: Low Temp of 3°C /n13 T Rancho Cucamonga, January 14: Low Temp of 37°F /nRancho Cucamonga, January 14: Low Temp of 3°C /n14 W Rancho Cucamonga, January 15: Low Temp of 36°F /nRancho Cucamonga, January 15: Low Temp of 2°C /n15 Th Rancho Cucamonga, January 16: Low Temp of 35°F /nRancho Cucamonga, January 16: Low Temp of 2°C /n16 F Rancho Cucamonga, January 17: Low Temp of 35°F /nRancho Cucamonga, January 17: Low Temp of 2°C /n17 S Rancho Cucamonga, January 18: Low Temp of 35°F /nRancho Cucamonga, January 18: Low Temp of 2°C /n18 Sn Rancho Cucamonga, January 19: Low Temp of 36°F /nRancho Cucamonga, January 19: Low Temp of 2°C /n19 M Rancho Cucamonga, January 20: Low Temp of 37°F /nRancho Cucamonga, January 20: Low Temp of 3°C /n20 T Rancho Cucamonga, January 21: Low Temp of 38°F /nRancho Cucamonga, January 21: Low Temp of 3°C /n21 W Rancho Cucamonga, January 22: Low Temp of 39°F /nRancho Cucamonga, January 22: Low Temp of 4°C /n22 Th Rancho Cucamonga, January 23: Low Temp of 38°F /nRancho Cucamonga, January 23: Low Temp of 3°C /n23 F Rancho Cucamonga, January 24: Low Temp of 38°F /nRancho Cucamonga, January 24: Low Temp of 3°C /n24 S Rancho Cucamonga, January 25: Low Temp of 38°F /nRancho Cucamonga, January 25: Low Temp of 3°C /n25 Sn Rancho Cucamonga, January 26: Low Temp of 40°F /nRancho Cucamonga, January 26: Low Temp of 4°C /n26 M Rancho Cucamonga, January 27: Low Temp of 38°F /nRancho Cucamonga, January 27: Low Temp of 3°C /n27 T Rancho Cucamonga, January 28: Low Temp of 39°F /nRancho Cucamonga, January 28: Low Temp of 4°C /n28 W Rancho Cucamonga, January 29: Low Temp of 37°F /nRancho Cucamonga, January 29: Low Temp of 3°C /n29 Th Rancho Cucamonga, January 30: Low Temp of 38°F /nRancho Cucamonga, January 30: Low Temp of 3°C /n30 F Rancho Cucamonga, January 31: Low Temp of 37°F /nRancho Cucamonga, January 31: Low Temp of 3°C /n31 S

Low Temperature Graph: Displays daily forecasted lows. Vertical rectangles on each plot point indicate forecast uncertainty, aiding in identifying temperature trends rather than exact figures.

January 2026 Summary

Precipitation Forecast
Average Precipitation
Rain Frequency 3 to 5 days
Temperature Forecast
Temperature Forecast Normal
Avg High Temps
Avg Low Temps