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United States weather

Weather in San Mateo, California for May 2026

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

    Temperatures

  • The forecast for the first days of May 2026 in San Mateo predicts temperatures to be around 18 °F, close to the historical average.

  • In general, the average temperature in San Mateo at the beginning of May is 17 °F. As the month progressed, temperatures tended to moderately fall, 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

  • 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
16°/10°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
82 %
Avg humidity

San Mateo Weather May

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

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
April June
Date Weather Temperatures Rain UV More
May 1 Cloudy
Cloudy
 19° /11° 0.1 mm 8.1
May 2 Cloudy
Cloudy
 16° /12° 0.1 mm 5.7
May 3 Patchy rain possible
Patchy rain possible
 16° /12° 0.1 mm 5.9
May 4 Partly cloudy
Partly cloudy
 16° /11° 0.1 mm 0
May 5 Partly cloudy
Partly cloudy
 17° /11° 0 mm 4
May 6 Sunny
Sunny
 18° /11° 0 mm 4
May 7 Overcast
Overcast
 17° /11° 0 mm 3
May 8 Patchy rain possible
Patchy rain possible
 17° /12° 0.3 mm 3
May 9 Patchy rain possible
Patchy rain possible
 16° /12° 0.5 mm 3
May 10 Sunny
Sunny
 18° /11° 0 mm 4
May 11 Sunny
Sunny
 18° /10° 0 mm 4
May 12 Sunny
Sunny
 20° /11° 0 mm 5
May 13 Partly cloudy
Partly cloudy
 18° /11° 0 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
Next
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.
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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.

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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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