Annual mean 26°C · wettest around November · prevailing wind N
Warmest
31.4 °C
Coldest
26.1 °C
Wettest
92%
Windiest
4.1 m/s
Prevailing
N
3.4 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 Francisco over the whole year is 26°C. May is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 20°C. San Francisco has no sharply defined rainy season: the chance of rain on a given day runs from 43% in May, the driest month, to 61% in November, the wettest. Winds in San Francisco are highest in July, averaging 2.6 m/s (9 km/h), and lightest in October, at 1.7 m/s (6 km/h). The prevailing wind is from the N. The clearest skies in San Francisco come in March, when the sky is typically 45% covered; October is the cloudiest month, at 65%.
Month by month San Francisco 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
27°C
20°C
29°C
54%
56%
2.0 m/s
31
65
9
February
28°C
20°C
29°C
47%
48%
2.3 m/s
26
67
7
March
29°C
21°C
31°C
48%
45%
2.3 m/s
13
64
2
April
30°C
22°C
33°C
45%
48%
2.4 m/s
6
50
1
May
31°C
24°C
34°C
43%
52%
2.3 m/s
2
34
1
June
31°C
24°C
34°C
50%
64%
2.3 m/s
3
35
1
July
30°C
23°C
33°C
56%
59%
2.6 m/s
3
44
1
August
31°C
23°C
34°C
58%
58%
2.2 m/s
3
37
1
September
31°C
24°C
34°C
53%
60%
1.9 m/s
2
32
1
October
29°C
23°C
33°C
58%
65%
1.7 m/s
7
43
1
November
27°C
22°C
30°C
61%
65%
1.8 m/s
18
59
4
December
27°C
21°C
29°C
57%
63%
1.9 m/s
28
60
8
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 Francisco weather by season
Year round, San Francisco has days of about 27°C at their warmest in January, its coolest month, and 31°C in May, its warmest; the coolest hours of the day run from 20°C to 24°C through the year, and the average temperature over the year is 26°C around the clock. Rain is most likely around November and least likely around May. 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 Francisco weather in winterDecember to February
High 27°CLow 20°CRain 53%
Winter in San Francisco has typical daily highs of about 27°C and lows of about 20°C, with a 53% chance of rain on a given day.
San Francisco weather in springMarch to May
High 30°CLow 22°CRain 45%
Spring in San Francisco has typical daily highs of about 30°C and lows of about 22°C, with a 45% chance of rain on a given day.
San Francisco weather in summerJune to August
High 31°CLow 23°CRain 55%
Summer in San Francisco has typical daily highs of about 31°C and lows of about 23°C, with a 55% chance of rain on a given day.
San Francisco weather in autumnSeptember to November
High 29°CLow 23°CRain 57%
Autumn in San Francisco has typical daily highs of about 29°C and lows of about 23°C, with a 57% chance of rain on a given day.
When is the rainy season in San Francisco?
San Francisco has no sharply defined rainy season: the chance of rain on a given day runs from 43% in May, the driest month, to 61% in November, the wettest.
What time of year is San Francisco windiest?
Winds in San Francisco are highest in July, averaging 2.6 m/s (9 km/h), and lightest in October, at 1.7 m/s (6 km/h). The prevailing wind is from the N.
What is the average temperature in San Francisco year round?
The average temperature in San Francisco over the whole year is 26°C. May is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 20°C.