Annual mean 13°C · wettest around March · prevailing wind W
Warmest
19.6 °C
Coldest
12.7 °C
Wettest
88%
Windiest
5.2 m/s
Prevailing
W
4.3 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
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 Bruno over the whole year is 13°C. September is the hottest month, with highs of about 19°C; February is the coldest, with lows of about 8°C. The rainy (wet) season in San Bruno runs from October to May, peaking in March with a 88% chance of rain on a given day. The dry season is June to September; June is the driest month, at 37%. Winds in San Bruno are highest in May, averaging 3.7 m/s (13 km/h), and lightest in October, at 2.5 m/s (9 km/h). The prevailing wind is from the W. The clearest skies in San Bruno come in November, when the sky is typically 39% covered; July is the cloudiest month, at 60%.
Month by month San Bruno 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
13°C
9°C
10°C
88%
52%
3.0 m/s
12
0
72
February
14°C
8°C
10°C
87%
40%
3.3 m/s
16
0
67
March
14°C
9°C
10°C
88%
52%
3.5 m/s
12
0
69
April
15°C
10°C
11°C
86%
47%
3.6 m/s
20
1
75
May
16°C
11°C
13°C
85%
53%
3.7 m/s
25
3
79
June
17°C
13°C
15°C
37%
48%
3.7 m/s
34
6
79
July
17°C
13°C
16°C
57%
60%
3.3 m/s
47
8
78
August
18°C
14°C
17°C
54%
59%
3.1 m/s
66
9
77
September
19°C
14°C
17°C
54%
49%
2.9 m/s
64
9
77
October
19°C
12°C
16°C
80%
41%
2.5 m/s
57
7
78
November
16°C
10°C
13°C
86%
39%
2.6 m/s
30
0
80
December
14°C
9°C
11°C
87%
45%
2.8 m/s
13
0
73
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 Bruno weather by season
Year round, San Bruno has days of about 13°C at their warmest in January, its coolest month, and 19°C in September, its warmest; the coolest hours of the day run from 8°C to 14°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around March and least likely around June. 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 Bruno weather in winterDecember to February
High 14°CLow 9°CRain 87%
Winter in San Bruno has typical daily highs of about 14°C and lows of about 9°C, with a 87% chance of rain on a given day.
San Bruno weather in springMarch to May
High 15°CLow 10°CRain 86%
Spring in San Bruno has typical daily highs of about 15°C and lows of about 10°C, with a 86% chance of rain on a given day.
San Bruno weather in summerJune to August
High 18°CLow 13°CRain 49%
Summer in San Bruno has typical daily highs of about 18°C and lows of about 13°C, with a 49% chance of rain on a given day.
San Bruno weather in autumnSeptember to November
High 18°CLow 12°CRain 73%
Autumn in San Bruno has typical daily highs of about 18°C and lows of about 12°C, with a 73% chance of rain on a given day.
When is the rainy season in San Bruno?
The rainy (wet) season in San Bruno runs from October to May, peaking in March with a 88% chance of rain on a given day. The dry season is June to September; June is the driest month, at 37%.
What time of year is San Bruno windiest?
Winds in San Bruno are highest in May, averaging 3.7 m/s (13 km/h), and lightest in October, at 2.5 m/s (9 km/h). The prevailing wind is from the W.
What is the average temperature in San Bruno year round?
The average temperature in San Bruno over the whole year is 13°C. September is the hottest month, with highs of about 19°C; February is the coldest, with lows of about 8°C.