Rancho Cucamonga
August
Weather in Rancho Cucamonga for August 2025
Your guide to Rancho Cucamonga weather in August - trends and predictions
In general, the average temperature in Rancho Cucamonga at the beginning of August is 36 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 34.4 °F by the end of August.
Rancho Cucamonga sees moderate rainfall in August, averaging 7 rainy days.
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24
Dry days
7
Rainy days
0
Snow days
34°/20°
Temperatures
16 km/h
Avg max wind
41 %
Avg humidity
Rancho Cucamonga in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  35° | 2  36° | 3  35° | ||||
| 4 36° | 5 38° | 6 38° | 7 34° | 8  34° | 9  33° | 10 32° |
| 11 32° | 12 32° | 13 33° | 14 34° | 15 36° | 16  36° | 17 36° |
| 18 36° | 19 33° | 20 31° | 21 31° | 22  30° | 23 30° | 24 29° |
| 25 32° | 26 34° | 27 35° | 28 36° | 29 35° | 30 35° | 31 34° |
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Temperatures trend during August in Rancho Cucamonga
See the weather trend as well as the moving average line
August weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 | Overcast | 35° /20° | 0 mm | 8 | |
| Aug. 2 | Partly cloudy | 36° /20° | 0 mm | 9 | |
| Aug. 3 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 4 | Sunny | 36° /20° | 0 mm | 9 | |
| Aug. 5 | Sunny | 38° /22° | 0 mm | 9 | |
| Aug. 6 | Sunny | 38° /22° | 0 mm | 9 | |
| Aug. 7 | Sunny | 34° /20° | 0 mm | 9 | |
| Aug. 8 | Patchy rain possible | 34° /18° | 0.3 mm | 8 | |
| Aug. 9 | Moderate or heavy rain shower | 33° /19° | 3 mm | 8 | |
| Aug. 10 | Patchy rain possible | 32° /20° | 0.1 mm | 8 | |
| Aug. 11 | Patchy rain possible | 32° /19° | 0.2 mm | 8 | |
| Aug. 12 | Sunny | 32° /18° | 0 mm | 8 | |
| Aug. 13 | Sunny | 33° /18° | 0 mm | 8 | |
| Aug. 14 | Sunny | 34° /19° | 0 mm | 9 | |
| Aug. 15 | Sunny | 36° /20° | 0 mm | 9 | |
| Aug. 16 | Heavy rain at times | 36° /21° | 0.6 mm | 8 | |
| Aug. 17 | Sunny | 36° /21° | 0 mm | 9 | |
| Aug. 18 | Sunny | 36° /19° | 0 mm | 9 | |
| Aug. 19 | Patchy rain possible | 33° /20° | 0.4 mm | 8 | |
| Aug. 20 | Moderate or heavy rain shower | 31° /21° | 37.3 mm | 7 | |
| Aug. 21 | Patchy rain possible | 31° /18° | 11.3 mm | 7 | |
| Aug. 22 | Cloudy | 30° /17° | 0 mm | 7 | |
| Aug. 23 | Sunny | 30° /15° | 0 mm | 8 | |
| Aug. 24 | Partly cloudy | 29° /16° | 0 mm | 8 | |
| Aug. 25 | Partly cloudy | 32° /16° | 0 mm | 8 | |
| Aug. 26 | Sunny | 34° /19° | 0 mm | 8 | |
| Aug. 27 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 28 | Sunny | 36° /21° | 0 mm | 9 | |
| Aug. 29 | Sunny | 35° /21° | 0 mm | 9 | |
| Aug. 30 | Sunny | 35° /21° | 0 mm | 9 | |
| Aug. 31 | Sunny | 34° /21° | 0 mm | 8 | |
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Important Notice
Our weather forecast for Rancho Cucamonga in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Rancho Cucamonga forecast closer to your planned date for the most up-to-date weather information.
Rancho Cucamonga in August - FAQ
What are the expected maximum and minimum temperatures in Rancho Cucamonga during August?
Expect warm days with temperatures around 34°, cooling to mild conditions of 20° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Rancho Cucamonga during August?
Significant rainfall exceeding 106.2 mm is expected in Rancho Cucamonga during August, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Rancho Cucamonga during August?
The average wind speed in Rancho Cucamonga during August is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
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