Annual mean 28°C · wettest around May · prevailing wind N
Warmest
32.5 °C
Coldest
27.7 °C
Wettest
100%
Windiest
5.4 m/s
Prevailing
N
4.0 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. September is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 23°C. The rainy (wet) season in San Mateo runs from May to October, peaking in May with a 53% chance of rain on a given day. The dry season is March to April; March is the driest month, at 25%. Winds in San Mateo are highest in March, averaging 3.8 m/s (14 km/h), and lightest in July, at 2.4 m/s (9 km/h). The prevailing wind is from the N. The clearest skies in San Mateo come in November, when the sky is typically 14% covered; August is the cloudiest month, at 27%.
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
30°C
23°C
32°C
26%
16%
3.3 m/s
8
71
1
February
30°C
24°C
31°C
41%
15%
3.5 m/s
11
74
2
March
31°C
24°C
31°C
25%
16%
3.8 m/s
9
69
1
April
31°C
25°C
32°C
25%
21%
3.8 m/s
6
63
1
May
31°C
25°C
33°C
53%
24%
3.5 m/s
4
54
1
June
30°C
25°C
33°C
53%
18%
3.0 m/s
7
50
1
July
30°C
25°C
34°C
53%
23%
2.4 m/s
4
33
1
August
31°C
25°C
35°C
47%
27%
2.7 m/s
2
32
0
September
32°C
25°C
35°C
51%
25%
2.9 m/s
1
25
0
October
32°C
25°C
35°C
50%
18%
2.8 m/s
2
28
0
November
31°C
25°C
34°C
29%
14%
2.6 m/s
3
36
1
December
30°C
24°C
32°C
28%
15%
2.9 m/s
6
69
1
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 30°C at their warmest in July, its coolest month, and 32°C in September, its warmest; the coolest hours of the day run from 23°C to 25°C through the year, and the average temperature over the year is 28°C around the clock. Rain is most likely around May 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 30°CLow 24°CRain 31%
Winter in San Mateo has typical daily highs of about 30°C and lows of about 24°C, with a 31% chance of rain on a given day.
San Mateo weather in springMarch to May
High 31°CLow 25°CRain 34%
Spring in San Mateo has typical daily highs of about 31°C and lows of about 25°C, with a 34% chance of rain on a given day.
San Mateo weather in summerJune to August
High 30°CLow 25°CRain 51%
Summer in San Mateo has typical daily highs of about 30°C and lows of about 25°C, with a 51% chance of rain on a given day.
San Mateo weather in autumnSeptember to November
High 32°CLow 25°CRain 43%
Autumn in San Mateo has typical daily highs of about 32°C and lows of about 25°C, with a 43% chance of rain on a given day.
When is the rainy season in San Mateo?
The rainy (wet) season in San Mateo runs from May to October, peaking in May with a 53% chance of rain on a given day. The dry season is March to April; March is the driest month, at 25%.
What time of year is San Mateo windiest?
Winds in San Mateo are highest in March, averaging 3.8 m/s (14 km/h), and lightest in July, at 2.4 m/s (9 km/h). The prevailing wind is from the N.
What is the average temperature in San Mateo year round?
The average temperature in San Mateo over the whole year is 28°C. September is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 23°C.