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Weather in San Mateo, California for October 2026

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

    Temperatures

  • So far, October 2026 in San Mateo is slightly warmer than the historical average by 1.2 °C.

  • The forecast for the next days in San Mateo predicts temperatures to be around 18 °C, close to the historical average.

  • In general, the average temperature in San Mateo at the beginning of October is 23.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18 °C by the end of October.

    • Rain 🌧️

  • With an average of 2 rainy days, San Mateo experiences minimal rainfall in October.

    • More

  • Is October a good time to visit San Mateo? check out the best time to travel to San Mateo page.

  • ✨ Is October a good time to visit San Mateo? – Ask the AI Weatherman

Average dry days
29
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/13°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
72 %
Avg humidity

San Mateo Weather October

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

Temperatures trend during October in San Mateo

See the weather trend as well as the moving average line

October weather in San Mateo day by day

Click on a date for more information
September November
Date Weather Temperatures Rain UV More
Oct. 1 Moderate rain
Moderate rain
 25° /15° 16 mm 6
Oct. 2 Sunny
Sunny
 24° /15° 0 mm 4
Oct. 3 Sunny
Sunny
 22° /14° 0 mm 5
Oct. 4 Overcast
Overcast
 23° /16° 0 mm 4
Oct. 5 Partly cloudy
Partly cloudy
 23° /16° 0 mm 5.8
Oct. 6 Cloudy
Cloudy
 25° /16° 0 mm 5
Oct. 7 Cloudy
Cloudy
 25° /16° 0 mm 5.6
Oct. 8 Overcast
Overcast
 21° /14° 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° /11° 0 mm 4
Oct. 12 Overcast
Overcast
 17° /12° 0 mm 4
Oct. 13 Moderate rain
Moderate rain
 19° /12° 12.5 mm 4
Oct. 14 Overcast
Overcast
 17° /11° 0.4 mm 4
Oct. 15 Overcast
Overcast
 19° /13° 0 mm 4
Oct. 16 Patchy rain possible
Patchy rain possible
 19° /13° 0.3 mm 4
Oct. 17 Overcast
Overcast
 21° /12° 0 mm 4
Oct. 18 Sunny
Sunny
 21° /12° 0 mm 4
Oct. 19 Sunny
Sunny
 19° /13° 0 mm 4
Oct. 20 Sunny
Sunny
 22° /12° 0 mm 4.5
Oct. 21 Overcast
Overcast
 20° /13° 0.3 mm 4
Oct. 22 Light rain
Light rain
 16° /12° 3.3 mm 3
Oct. 23 Overcast
Overcast
 17° /12° 0 mm 4
Oct. 24 Sunny
Sunny
 19° /13° 0 mm 4
Oct. 25 Overcast
Overcast
 19° /13° 0 mm 4
Oct. 26 Cloudy
Cloudy
 18° /12° 0 mm 4
Oct. 27 Cloudy
Cloudy
 18° /13° 0 mm 4
Oct. 28 Partly cloudy
Partly cloudy
 18° /11° 0 mm 3.4
Oct. 29 Overcast
Overcast
 18° /12° 0 mm 1.9
Oct. 30 Sunny
Sunny
 17° /13° 0 mm 3.5
Oct. 31 Overcast
Overcast
 17° /12° 0 mm 2.6
Next
Important Notice
Our weather forecast for San Mateo 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 forecast closer to your planned date for the most up-to-date weather information.
Change Month
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San Mateo in October - FAQ

What are the expected maximum and minimum temperatures in San Mateo during October?
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 during October?
In October, San Mateo can expect light to moderate rainfall, totaling 29.9 mm across approximately 2 days. Occasional showers are possible, and planning ahead for them could be helpful.

What are the typical wind conditions in San Mateo during October?
The average wind speed in San Mateo during October is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

October rainfall patterns in San Mateo

Explore the daily rainfall trends and prepare for San Mateos October weather 💧
Typically, San Mateo has 2 rainy days in October with a total of 29.9 mm of rainfall.

UV exposure in San Mateo 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?

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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