Rancho Cucamonga, United States Daily Weather Forecast for August 2025

Our Rancho Cucamonga, United States Daily Weather Forecast for August 2025, developed from a specialized dynamic long-range model, provides precise daily temperature and rainfall predictions. This model, distinct from standard statistical or climatological approaches, is the result of over 50 years of dedicated private research, offering a clearer and more accurate meteorological insight.

1
Fri
05%
Sunrise
6:01AM
Sunset
7:50PM
First Quarter
2
Sat
05%
Sunrise
6:01AM
Sunset
7:50PM
Waxing Gibbous
3
Sun
06%
Sunrise
6:02AM
Sunset
7:49PM
Waxing Gibbous
4
Mon
06%
Sunrise
6:03AM
Sunset
7:48PM
Waxing Gibbous
5
Tue
06%
Sunrise
6:04AM
Sunset
7:47PM
Waxing Gibbous
6
Wed
11%
Sunrise
6:04AM
Sunset
7:46PM
Waxing Gibbous
7
Thu
06%
Sunrise
6:05AM
Sunset
7:45PM
Waxing Gibbous
8
Fri
06%
Sunrise
6:06AM
Sunset
7:44PM
Waxing Gibbous
9
Sat
04%
Sunrise
6:07AM
Sunset
7:43PM
Full Moon
10
Sun
05%
Sunrise
6:07AM
Sunset
7:42PM
Waning Gibbous
11
Mon
05%
Sunrise
6:08AM
Sunset
7:41PM
Waning Gibbous
12
Tue
04%
Sunrise
6:09AM
Sunset
7:40PM
Waning Gibbous
13
Wed
06%
Sunrise
6:09AM
Sunset
7:39PM
Waning Gibbous
14
Thu
04%
Sunrise
6:10AM
Sunset
7:37PM
Waning Gibbous
15
Fri
06%
Sunrise
6:11AM
Sunset
7:36PM
Waning Gibbous
16
Sat
11%
Sunrise
6:12AM
Sunset
7:35PM
Last Quarter
17
Sun
27%
Sunrise
6:12AM
Sunset
7:34PM
Waning Crescent
18
Mon
06%
Sunrise
6:13AM
Sunset
7:33PM
Waning Crescent
19
Tue
06%
Sunrise
6:14AM
Sunset
7:32PM
Waning Crescent
20
Wed
26%
Sunrise
6:15AM
Sunset
7:30PM
Waning Crescent
21
Thu
11%
Sunrise
6:15AM
Sunset
7:29PM
Waning Crescent
22
Fri
06%
Sunrise
6:16AM
Sunset
7:28PM
Waning Crescent
23
Sat
04%
Sunrise
6:17AM
Sunset
7:27PM
New Moon
24
Sun
18%
Sunrise
6:17AM
Sunset
7:26PM
Waxing Crescent
25
Mon
06%
Sunrise
6:18AM
Sunset
7:24PM
Waxing Crescent
26
Tue
06%
Sunrise
6:19AM
Sunset
7:23PM
Waxing Crescent
27
Wed
06%
Sunrise
6:20AM
Sunset
7:22PM
Waxing Crescent
28
Thu
06%
Sunrise
6:20AM
Sunset
7:20PM
Waxing Crescent
29
Fri
04%
Sunrise
6:21AM
Sunset
7:19PM
Waxing Crescent
30
Sat
06%
Sunrise
6:22AM
Sunset
7:18PM
Waxing Crescent
31
Sun
19%
Sunrise
6:22AM
Sunset
7:16PM
First Quarter

August 2025 Summary

Precipitation Forecast
Average Precipitation
Rain Frequency 0 - 2 days
Temperature Forecast
Temperature Forecast Normal
Avg High Temps
Avg Low Temps

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.
Avg High Temps Avg Low Temps
Our forecasts are not direct predictions of rain/snow. Not all risky days will have rain/snow. However, if it does rain/snow during the month, expect most of it to occur on higher risk days.
other WeatherTAB forecast views...
Detailed Forecast - Detailed analysis of the monthly forecast
Calendar Forecast - Quick reference view of month