San Mateo County (San Mateo)
October
Weather in San Mateo County, California for October 2025
Your guide to San Mateo County weather in October - trends and predictions
In general, the average temperature in San Mateo County at the beginning of October is 28.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.9 °F by the end of October.
With an average of 3 rainy days, San Mateo County experiences minimal rainfall in October.
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Temperatures
Rain 🌧️
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28
Dry days
3
Rainy days
0
Snow days
21°/14°
Temperatures
16 km/h
Avg max wind
70 %
Avg humidity
San Mateo County Weather October
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 |  Sunny | 33° /19° | 0 mm | 8 | |
| Oct. 2 | Sunny | 30° /19° | 0 mm | 8 | |
| Oct. 3 | Sunny | 26° /17° | 0 mm | 7 | |
| Oct. 4 |  Partly cloudy | 25° /17° | 0 mm | 7 | |
| Oct. 5 | Partly cloudy | 30° /19° | 0 mm | 8 | |
| Oct. 6 |  Cloudy | 29° /19° | 0 mm | 6 | |
| Oct. 7 | Cloudy | 26° /18° | 0 mm | 6 | |
| Oct. 8 |  Overcast | 19° /14° | 0 mm | 4 | |
| Oct. 9 | Overcast | 19° /13° | 0 mm | 4 | |
| Oct. 10 | Overcast | 19° /13° | 0 mm | 4 | |
| Oct. 11 | Overcast | 18° /12° | 0 mm | 4 | |
| Oct. 12 | Overcast | 19° /14° | 0 mm | 4 | |
| Oct. 13 |  Patchy rain possible | 19° /14° | 0.5 mm | 4 | |
| Oct. 14 | Overcast | 16° /12° | 0 mm | 4 | |
| Oct. 15 | Overcast | 18° /13° | 0 mm | 4 | |
| Oct. 16 |  Moderate rain at times | 17° /13° | 0.9 mm | 4 | |
| Oct. 17 | Overcast | 17° /12° | 0 mm | 4 | |
| Oct. 18 | Sunny | 20° /14° | 0 mm | 5 | |
| Oct. 19 | Sunny | 23° /15° | 0 mm | 6 | |
| Oct. 20 | Sunny | 22° /13° | 0 mm | 6 | |
| Oct. 21 | Overcast | 17° /11° | 0 mm | 4 | |
| Oct. 22 | Overcast | 16° /11° | 0 mm | 4 | |
| Oct. 23 | Overcast | 18° /11° | 0 mm | 4 | |
| Oct. 24 | Sunny | 22° /14° | 0 mm | 6 | |
| Oct. 25 | Overcast | 20° /13° | 0 mm | 5 | |
| Oct. 26 | Cloudy | 19° /12° | 0 mm | 4 | |
| Oct. 27 | Cloudy | 19° /14° | 0 mm | 4 | |
| Oct. 28 | Patchy rain possible | 14° /11° | 0.2 mm | 3 | |
| Oct. 29 | Partly cloudy | 15° /9° | 0 mm | 5 | |
| Oct. 30 | Overcast | 15° /10° | 0 mm | 4 | |
| Oct. 31 | Patchy rain possible | 16° /12° | 1.3 mm | 4 | |
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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.
Change Month
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 3 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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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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