Annual mean 28°C · wettest around September · prevailing wind E
Warmest
32.8 °C
Coldest
28.1 °C
Wettest
67%
Windiest
4.0 m/s
Prevailing
E
3.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in San Mateo over the whole year is 28°C. May is the hottest month, with highs of about 33°C; February is the coldest, with lows of about 24°C. The rainy (wet) season in San Mateo runs from April to December, peaking in September with a 66% chance of rain on a given day. The dry season is January to March; March is the driest month, at 34%. Winds in San Mateo are highest in February, averaging 2.8 m/s (10 km/h), and lightest in June, at 2.3 m/s (8 km/h). The prevailing wind is from the E. The clearest skies in San Mateo come in April, when the sky is typically 49% covered; July is the cloudiest month, at 77%.
Month by month San Mateo climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
28°C
24°C
31°C
40%
65%
2.7 m/s
15
58
5
February
29°C
24°C
31°C
39%
56%
2.8 m/s
15
59
4
March
30°C
25°C
33°C
34%
51%
2.8 m/s
8
46
2
April
32°C
26°C
35°C
50%
49%
2.7 m/s
3
24
0
May
33°C
27°C
36°C
54%
60%
2.5 m/s
1
13
0
June
31°C
27°C
36°C
62%
70%
2.3 m/s
2
16
0
July
30°C
26°C
34°C
64%
77%
2.5 m/s
3
23
0
August
30°C
26°C
34°C
64%
76%
2.7 m/s
4
28
0
September
30°C
26°C
34°C
66%
75%
2.4 m/s
4
25
0
October
30°C
26°C
34°C
57%
70%
2.3 m/s
4
27
0
November
30°C
25°C
33°C
53%
64%
2.4 m/s
7
33
1
December
29°C
25°C
32°C
50%
69%
2.5 m/s
11
43
3
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short San Mateo weather by season
Year round, San Mateo has days of about 28°C at their warmest in January, its coolest month, and 33°C in May, its warmest; the coolest hours of the day run from 24°C to 27°C through the year, and the average temperature over the year is 28°C around the clock. Rain is most likely around September and least likely around March. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
San Mateo weather in winterDecember to February
High 29°CLow 24°CRain 43%
Winter in San Mateo has typical daily highs of about 29°C and lows of about 24°C, with a 43% chance of rain on a given day.
San Mateo weather in springMarch to May
High 32°CLow 26°CRain 46%
Spring in San Mateo has typical daily highs of about 32°C and lows of about 26°C, with a 46% chance of rain on a given day.
San Mateo weather in summerJune to August
High 30°CLow 26°CRain 63%
Summer in San Mateo has typical daily highs of about 30°C and lows of about 26°C, with a 63% chance of rain on a given day.
San Mateo weather in autumnSeptember to November
High 30°CLow 26°CRain 58%
Autumn in San Mateo has typical daily highs of about 30°C and lows of about 26°C, with a 58% chance of rain on a given day.
When is the rainy season in San Mateo?
The rainy (wet) season in San Mateo runs from April to December, peaking in September with a 66% chance of rain on a given day. The dry season is January to March; March is the driest month, at 34%.
What time of year is San Mateo windiest?
Winds in San Mateo are highest in February, averaging 2.8 m/s (10 km/h), and lightest in June, at 2.3 m/s (8 km/h). The prevailing wind is from the E.
What is the average temperature in San Mateo year round?
The average temperature in San Mateo over the whole year is 28°C. May is the hottest month, with highs of about 33°C; February is the coldest, with lows of about 24°C.