Rancho Cucamonga (CA)
August
Weather in Rancho Cucamonga, California 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.
With an average of 3 rainy days, Rancho Cucamonga experiences minimal rainfall in August.
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Temperatures
Rain 🌧️
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28
Dry days
3
Rainy days
0
Snow days
34°/20°
Temperatures
16 km/h
Avg max wind
36 %
Avg humidity
Rancho Cucamonga Weather August
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Temperatures trend during August in Rancho Cucamonga
See the weather trend as well as the moving average line
August weather in Rancho Cucamonga 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.
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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?
Moderate rainfall is anticipated in Rancho Cucamonga during August, with a total of 53.1 mm spread over approximately 3 days. Considering plans for rainy days is advisable.
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.
August rainfall patterns in Rancho Cucamonga
Explore the daily rainfall trends and prepare for Rancho Cucamongas August weather 💧
UV exposure in Rancho Cucamonga during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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Where is Rancho Cucamonga?Get accurate weather forecasts for Rancho Cucamonga, located at latitude 34.106 and longitude -117.593. Stay updated with localized weather information tailored for Rancho Cucamonga.
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