San Mateo County (San Mateo)
August
Weather in San Mateo County, California for August 2027
Your guide to San Mateo County weather in August - trends and predictions
In general, the average temperature in San Mateo County at the beginning of August is 20.3 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 21.4 °C by the end of August.
Precipitation in San Mateo County during August is a rare event, with an average of fewer than 2 rainy days.
Is August a good time to visit San Mateo County? check out the best time to travel to San Mateo County page.
✨ Is August a good time to visit San Mateo County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
31
Dry days
0
Rainy days
0
Snow days
20°/13°
Temperatures
17 km/h
Avg max wind
79 %
Avg humidity
San Mateo County Weather August
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Temperatures trend during August in San Mateo County
See the weather trend as well as the moving average line
August weather in San Mateo County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Overcast | 21° /13° | 0 mm | 7 | |
| Aug. 2 |  Cloudy | 22° /13° | 0 mm | 7 | |
| Aug. 3 | Overcast | 21° /12° | 0 mm | 7 | |
| Aug. 4 | Overcast | 19° /12° | 0 mm | 7 | |
| Aug. 5 | Overcast | 19° /12° | 0 mm | 6 | |
| Aug. 6 |  Sunny | 21° /12° | 0 mm | 7 | |
| Aug. 7 | Sunny | 20° /12° | 0 mm | 7 | |
| Aug. 8 | Overcast | 21° /13° | 0 mm | 7 | |
| Aug. 9 | Overcast | 21° /13° | 0 mm | 7 | |
| Aug. 10 | Overcast | 20° /12° | 0 mm | 7 | |
| Aug. 11 |  Partly cloudy | 20° /13° | 0 mm | 7 | |
| Aug. 12 | Overcast | 20° /12° | 0 mm | 7 | |
| Aug. 13 | Overcast | 19° /13° | 0 mm | 7 | |
| Aug. 14 | Overcast | 19° /14° | 0 mm | 5 | |
| Aug. 15 | Partly cloudy | 19° /13° | 0 mm | 6 | |
| Aug. 16 | Sunny | 20° /13° | 0 mm | 7 | |
| Aug. 17 |  Patchy rain possible | 21° /13° | 0.1 mm | 6 | |
| Aug. 18 | Overcast | 20° /13° | 0 mm | 4 | |
| Aug. 19 | Sunny | 19° /12° | 0 mm | 6 | |
| Aug. 20 | Sunny | 21° /13° | 0 mm | 4 | |
| Aug. 21 | Sunny | 20° /13° | 0 mm | 6 | |
| Aug. 22 | Patchy rain possible | 20° /13° | 0.3 mm | 5 | |
| Aug. 23 | Patchy rain possible | 22° /13° | 0.1 mm | 4 | |
| Aug. 24 | Patchy rain possible | 21° /13° | 0.1 mm | 7 | |
| Aug. 25 | Sunny | 21° /13° | 0 mm | 4 | |
| Aug. 26 | Sunny | 24° /14° | 0 mm | 7 | |
| Aug. 27 | Overcast | 23° /14° | 0 mm | 5 | |
| Aug. 28 | Overcast | 21° /14° | 0 mm | 4 | |
| Aug. 29 | Sunny | 21° /13° | 0 mm | 7 | |
| Aug. 30 | Sunny | 21° /13° | 0 mm | 6 | |
| Aug. 31 | Partly cloudy | 20° /13° | 0 mm | 5 | |
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Important Notice
Our weather forecast for San Mateo 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 Mateo County forecast closer to your planned date for the most up-to-date weather information.
Change Month
San Mateo County in August - FAQ
What are the expected maximum and minimum temperatures in San Mateo County during August?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Mateo County during August?
Rainfall in San Mateo County during August is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 0 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in San Mateo County during August?
The average wind speed in San Mateo County during August is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
UV exposure in San Mateo County during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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