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Weather in San Mateo County, California for October 2025

Your guide to San Mateo County weather in October - trends and predictions

    Official Weather Alert ⚠️

  • Beach Hazards Statement - See hour by hour.

    • Temperatures

  • Until now, October 2025 in San Mateo County is cooler than usual, with temperatures averaging 17.7 °F, this is -2.1 °F below the typical seasonal average.

  • Expect cooler weather in the next days in San Mateo County with the forecast suggesting a temperature of 19.1 °F, lower than the historical average.

  • In general, the average temperature in San Mateo County at the beginning of October is 23.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.9 °F by the end of October.

    • Rain 🌧️

  • Precipitation in San Mateo County during October 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
30
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/14°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
70 %
Avg humidity

San Mateo County Weather October

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

Temperatures trend during October in San Mateo County

See the weather trend as well as the moving average line

October weather in San Mateo County day by day

Click on a date for more information
September November
Date Weather Temperatures Rain UV More
Oct. 1 Sunny
Sunny
 25° /17° 24 mm 6
Oct. 2 Sunny
Sunny
 24° /16° 0 mm 6
Oct. 3 Sunny
Sunny
 20° /14° 0 mm 5
Oct. 4 Partly cloudy
Partly cloudy
 21° /15° 0 mm 6
Oct. 5 Partly cloudy
Partly cloudy
 23° /16° 0 mm 6
Oct. 6 Cloudy
Cloudy
 26° /16° 0 mm 6
Oct. 7 Cloudy
Cloudy
 25° /15° 0 mm 6
Oct. 8 Overcast
Overcast
 19° /13° 0 mm 4
Oct. 9 Overcast
Overcast
 19° /13° 0 mm 4
Oct. 10 Overcast
Overcast
 18° /12° 0 mm 4
Oct. 11 Overcast
Overcast
 17° /12° 0 mm 4
Oct. 12 Overcast
Overcast
 17° /12° 0 mm 4
Oct. 13 Patchy rain possible
Patchy rain possible
 18° /13° 18.8 mm 4
Oct. 14 Overcast
Overcast
 16° /11° 0.6 mm 4
Oct. 15 Overcast
Overcast
 17° /13° 0 mm 4
Oct. 16 Moderate rain at times
Moderate rain at times
 16° /11° 0.4 mm 4
Oct. 17 Overcast
Overcast
 18° /11° 0 mm 4
Oct. 18 Sunny
Sunny
 21° /12° 0 mm 5
Oct. 19 Sunny
Sunny
 20° /13° 0 mm 5
Oct. 20 Sunny
Sunny
 24° /13° 0 mm 7
Oct. 21 Overcast
Overcast
 20° /12° 0 mm 5
Oct. 22 Overcast
Overcast
 16° /11° 0 mm 4
Oct. 23 Overcast
Overcast
 17° /11° 0 mm 4
Oct. 24 Sunny
Sunny
 19° /12° 0 mm 5
Oct. 25 Partly cloudy
Partly cloudy
 20° /11° 0.1 mm 0.3
Oct. 26 Overcast
Overcast
 18° /14° 0 mm 0.6
Oct. 27 Overcast
Overcast
 18° /13° 0 mm 0.9
Oct. 28 Sunny
Sunny
 21° /14° 0 mm 0.9
Oct. 29 Sunny
Sunny
 20° /14° 0 mm 0
Oct. 30 Sunny
Sunny
 21° /14° 0 mm 5
Oct. 31 Sunny
Sunny
 21° /14° 0 mm 5
Next
Important Notice
Our weather forecast for San Mateo County in October 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.
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San Mateo County in October - FAQ

What are the expected maximum and minimum temperatures in San Mateo County during October?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Mateo County during October?
Rainfall in San Mateo County during October is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 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 October?
The average wind speed in San Mateo County during October is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

October rainfall patterns in San Mateo County

Explore the daily rainfall trends and prepare for San Mateo Countys October weather 💧

UV exposure in San Mateo County during October

Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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Location coordinates Where is San Mateo County?

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

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