San Bernardino County (Ontario)
August
Weather in San Bernardino County, California for August 2026
Your guide to San Bernardino County weather in August - trends and predictions
In general, the average temperature in San Bernardino County at the beginning of August is 34.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 34 °F by the end of August.
With an average of 3 rainy days, San Bernardino County experiences minimal rainfall in August.
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Temperatures
Rain 🌧️
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28
Dry days
3
Rainy days
0
Snow days
33°/19°
Temperatures
16 km/h
Avg max wind
37 %
Avg humidity
San Bernardino County Weather August
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Temperatures trend during August in San Bernardino County
See the weather trend as well as the moving average line
August weather in San Bernardino County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Overcast | 33° /21° | 0 mm | 7 | |
| Aug. 2 |  Sunny | 35° /19° | 0 mm | 9 | |
| Aug. 3 | Sunny | 34° /19° | 0 mm | 8 | |
| Aug. 4 | Sunny | 34° /19° | 0 mm | 8 | |
| Aug. 5 | Sunny | 36° /20° | 0 mm | 9 | |
| Aug. 6 | Sunny | 35° /21° | 0 mm | 9 | |
| Aug. 7 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 8 | Sunny | 35° /19° | 0 mm | 8 | |
| Aug. 9 |  Heavy rain at times | 33° /20° | 1.2 mm | 8 | |
| Aug. 10 | Sunny | 32° /20° | 0.1 mm | 8 | |
| Aug. 11 | Sunny | 31° /19° | 0 mm | 8 | |
| Aug. 12 | Sunny | 32° /18° | 0 mm | 8 | |
| Aug. 13 | Sunny | 32° /18° | 0 mm | 8 | |
| Aug. 14 | Sunny | 34° /18° | 0 mm | 8 | |
| Aug. 15 | Sunny | 34° /18° | 0 mm | 8 | |
| Aug. 16 | Sunny | 33° /18° | 0 mm | 8 | |
| Aug. 17 | Sunny | 34° /18° | 0 mm | 8 | |
| Aug. 18 | Sunny | 34° /17° | 0 mm | 8 | |
| Aug. 19 | Sunny | 32° /19° | 0 mm | 8 | |
| Aug. 20 |  Moderate or heavy rain shower | 31° /19° | 37.8 mm | 8 | |
| Aug. 21 | Sunny | 33° /19° | 9.2 mm | 8 | |
| Aug. 22 | Sunny | 33° /18° | 0 mm | 8 | |
| Aug. 23 | Sunny | 32° /17° | 0 mm | 8 | |
| Aug. 24 | Sunny | 31° /18° | 0 mm | 8 | |
| Aug. 25 |  Partly cloudy | 34° /18° | 0 mm | 8 | |
| Aug. 26 | Sunny | 33° /18° | 0 mm | 8 | |
| Aug. 27 | Sunny | 34° /18° | 0 mm | 8 | |
| Aug. 28 | Sunny | 33° /20° | 0 mm | 8 | |
| Aug. 29 | Sunny | 35° /20° | 0 mm | 8 | |
| Aug. 30 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 31 | Sunny | 34° /21° | 0 mm | 8 | |
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Important Notice
Our weather forecast for San Bernardino County 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 San Bernardino County forecast closer to your planned date for the most up-to-date weather information.
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San Bernardino County in August - FAQ
What are the expected maximum and minimum temperatures in San Bernardino County during August?
Expect warm days with temperatures around 33°, cooling to mild conditions of 19° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in San Bernardino County during August?
Moderate rainfall is anticipated in San Bernardino County during August, with a total of 53.6 mm spread over approximately 3 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in San Bernardino County during August?
The average wind speed in San Bernardino County during August is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in San Bernardino County
Explore the daily rainfall trends and prepare for San Bernardino Countys August weather 💧
UV exposure in San Bernardino County during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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Where is San Bernardino County?Get accurate weather forecasts for San Bernardino County, located at latitude 34.063 and longitude -117.651. Stay updated with localized weather information tailored for San Bernardino County.
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