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Weather in San Mateo, California for May 2026

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

    Temperatures

  • In general, the average temperature in San Mateo at the beginning of May is 16.1 °F. As the month progressed, temperatures tended to remain steady, reaching an average of 16.1 °F by the end of May.

  • Rain 🌧️

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

  • More

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Average dry days
30
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/10°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
83 %
Avg humidity

San Mateo Weather May

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Temperatures trend during May in San Mateo

See the weather trend as well as the moving average line

May weather in San Mateo day by day

Click on a date for more information
Date Weather Temperatures Rain UV More
May 1 Overcast
Overcast
15° /9° 0 mm 4
May 2 Overcast
Overcast
13° /9° 0 mm 3
May 3 Overcast
Overcast
12° /10° 0.1 mm 3
May 4 Partly cloudy
Partly cloudy
16° /9° 0 mm 5
May 5 Sunny
Sunny
22° /13° 0 mm 6
May 6 Partly cloudy
Partly cloudy
19° /11° 0 mm 5
May 7 Overcast
Overcast
16° /10° 0 mm 4
May 8 Overcast
Overcast
18° /9° 0 mm 4
May 9 Overcast
Overcast
20° /10° 0 mm 5
May 10 Overcast
Overcast
18° /11° 0 mm 4
May 11 Overcast
Overcast
14° /10° 0 mm 3
May 12 Heavy rain at times
Heavy rain at times
14° /10° 4 mm 3
May 13 Overcast
Overcast
15° /10° 0.1 mm 4
May 14 Overcast
Overcast
17° /9° 0 mm 4
May 15 Overcast
Overcast
17° /10° 0 mm 4
May 16 Overcast
Overcast
17° /10° 0 mm 4
May 17 Overcast
Overcast
15° /11° 0 mm 4
May 18 Cloudy
Cloudy
19° /9° 0 mm 4
May 19 Partly cloudy
Partly cloudy
20° /11° 0 mm 6
May 20 Overcast
Overcast
16° /9° 0 mm 4
May 21 Overcast
Overcast
18° /8° 0 mm 4
May 22 Overcast
Overcast
15° /10° 0 mm 4
May 23 Overcast
Overcast
13° /9° 0 mm 3
May 24 Overcast
Overcast
13° /9° 0 mm 3
May 25 Overcast
Overcast
11° /9° 0 mm 3
May 26 Overcast
Overcast
16° /10° 0 mm 4
May 27 Mist
Mist
16° /9° 0 mm 4
May 28 Mist
Mist
13° /10° 0 mm 3
May 29 Mist
Mist
18° /10° 0 mm 4
May 30 Mist
Mist
20° /11° 0 mm 5
May 31 Mist
Mist
19° /10° 0 mm 4
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Important Notice
Our weather forecast for San Mateo in May 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.

San Mateo in May - FAQ

What are the expected maximum and minimum temperatures in San Mateo during May?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Mateo during May?
Rainfall in San Mateo during May 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 during May?
The average wind speed in San Mateo during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in San Mateo

Explore the daily rainfall trends and prepare for San Mateos May weather 💧

UV exposure in San Mateo during May

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

Quick links

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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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