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Weather in San Mateo, California for August 2025

Your guide to San Mateo weather in August - trends and predictions

    Temperatures

  • Until now, August 2025 in San Mateo has been nearly identical to the historical average, with a temperature of 18.8 °F (showing only a slight deviation of -0.3 °F).

  • The forecast for the upcoming days in San Mateo predicts a temperature of 20.4 °F, which is slightly above the historical average.

  • In general, the average temperature in San Mateo at the beginning of August is 18.6 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 20.3 °F by the end of August.

    • Rain 🌧️

  • Precipitation in San Mateo during August is a rare event, with an average of fewer than 2 rainy days.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
31
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/13°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
79 %
Avg humidity

San Mateo Weather August

Move between months or click on a day
July
September
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
18°
2
Cloudy
19°
3
Overcast
18°
4
Overcast
18°
5
Overcast
18°
6
Sunny
20°
7
Sunny
19°
8
Overcast
21°
9
Overcast
20°
10
Overcast
19°
11
Overcast
20°
12
Overcast
19°
13
Partly cloudy
19°
14
Partly cloudy
19°
15
Partly cloudy
19°
16
Sunny
20°
17
Overcast
17°
18
Mist
17°
19
Overcast
16°
20
Sunny
22°
21
Sunny
24°
22
Sunny
24°
23
Patchy rain possible
21°
24
Partly cloudy
21°
25
Sunny
21°
26
Sunny
20°
27
Sunny
21°
28
Sunny
21°
29
Sunny
20°
30
Sunny
20°
31
Partly cloudy
19°

Temperatures trend during August in San Mateo

See the weather trend as well as the moving average line

August weather in San Mateo day by day

Click on a date for more information
July September
Date Weather Temperatures Rain UV More
Aug. 1 Overcast
Overcast
 18° /13° 0 mm 4
Aug. 2 Cloudy
Cloudy
 19° /13° 0 mm 5
Aug. 3 Overcast
Overcast
 18° /12° 0 mm 4
Aug. 4 Overcast
Overcast
 18° /12° 0 mm 4
Aug. 5 Overcast
Overcast
 18° /12° 0 mm 4
Aug. 6 Sunny
Sunny
 20° /12° 0 mm 5
Aug. 7 Sunny
Sunny
 19° /12° 0 mm 5
Aug. 8 Overcast
Overcast
 21° /13° 0 mm 5
Aug. 9 Overcast
Overcast
 20° /12° 0 mm 5
Aug. 10 Overcast
Overcast
 19° /12° 0 mm 5
Aug. 11 Overcast
Overcast
 20° /13° 0 mm 5
Aug. 12 Overcast
Overcast
 19° /12° 0 mm 5
Aug. 13 Partly cloudy
Partly cloudy
 19° /12° 0 mm 5
Aug. 14 Partly cloudy
Partly cloudy
 19° /13° 0 mm 5
Aug. 15 Partly cloudy
Partly cloudy
 19° /13° 0 mm 5
Aug. 16 Sunny
Sunny
 20° /14° 0 mm 5
Aug. 17 Overcast
Overcast
 17° /14° 0 mm 2.2
Aug. 18 Mist
Mist
 17° /12° 0 mm 2.3
Aug. 19 Overcast
Overcast
 16° /12° 0 mm 2.4
Aug. 20 Sunny
Sunny
 22° /13° 0 mm 0
Aug. 21 Sunny
Sunny
 24° /13° 0 mm 5
Aug. 22 Sunny
Sunny
 24° /13° 0 mm 5
Aug. 23 Patchy rain possible
Patchy rain possible
 21° /13° 0.1 mm 4
Aug. 24 Partly cloudy
Partly cloudy
 21° /14° 0 mm 5
Aug. 25 Sunny
Sunny
 21° /13° 0 mm 5
Aug. 26 Sunny
Sunny
 20° /14° 0 mm 5
Aug. 27 Sunny
Sunny
 21° /13° 0.1 mm 5
Aug. 28 Sunny
Sunny
 21° /13° 0 mm 5
Aug. 29 Sunny
Sunny
 20° /13° 0 mm 5
Aug. 30 Sunny
Sunny
 20° /12° 0 mm 5
Aug. 31 Partly cloudy
Partly cloudy
 19° /14° 0 mm 5
Next
Important Notice
Our weather forecast for San Mateo 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 forecast closer to your planned date for the most up-to-date weather information.
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San Mateo in August - FAQ

What are the expected maximum and minimum temperatures in San Mateo during August?
Enjoy moderate daytime temperatures of up to 19° 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 during August?
Rainfall in San Mateo 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 during August?
The average wind speed in San Mateo during August is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

UV exposure in San Mateo during August

Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️

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Location coordinates Where is San Mateo?

Get accurate weather forecasts for San Mateo, located at latitude 37.563 and longitude -122.326. Stay updated with localized weather information tailored for San Mateo.

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