Annual mean 22°C · wettest around December · prevailing wind S
Warmest
35.5 °C
Coldest
15.5 °C
Wettest
68%
Windiest
3.4 m/s
Prevailing
S
2.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 22°C. June is the hottest month, with highs of about 35°C; January is the coldest, with lows of about 7°C. The rainy (wet) season in San Francisco runs from December to March, peaking in December with a 29% chance of rain on a given day. The dry season is April to June; May is the driest month, at 9%. Winds in San Francisco are highest in March, averaging 2.8 m/s (10 km/h), and lightest in January, at 2.3 m/s (8 km/h). The prevailing wind is from the S. The clearest skies in San Francisco come in April, when the sky is typically 10% covered; July is the cloudiest month, at 27%.
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
17°C
7°C
13°C
24%
24%
2.3 m/s
42
1
79
February
19°C
8°C
15°C
22%
23%
2.7 m/s
53
3
77
March
22°C
11°C
18°C
23%
21%
2.8 m/s
65
13
71
April
26°C
14°C
23°C
12%
10%
2.8 m/s
68
39
46
May
30°C
18°C
27°C
9%
10%
2.7 m/s
51
55
24
June
35°C
24°C
34°C
14%
11%
2.7 m/s
11
41
2
July
35°C
27°C
37°C
24%
27%
2.7 m/s
4
21
1
August
34°C
26°C
37°C
22%
23%
2.4 m/s
5
24
1
September
33°C
23°C
34°C
27%
17%
2.4 m/s
15
39
4
October
29°C
17°C
28°C
17%
10%
2.4 m/s
41
49
23
November
22°C
11°C
20°C
16%
17%
2.3 m/s
69
22
62
December
17°C
8°C
14°C
29%
24%
2.3 m/s
49
2
79
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 17°C at their warmest in January, its coolest month, and 35°C in June, its warmest; the coolest hours of the day run from 7°C to 27°C through the year, and the average temperature over the year is 22°C around the clock. Rain is most likely around December 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 17°CLow 8°CRain 25%
Winter in San Francisco has typical daily highs of about 17°C and lows of about 8°C, with a 25% chance of rain on a given day.
San Francisco weather in springMarch to May
High 26°CLow 14°CRain 15%
Spring in San Francisco has typical daily highs of about 26°C and lows of about 14°C, with a 15% chance of rain on a given day.
San Francisco weather in summerJune to August
High 35°CLow 26°CRain 20%
Summer in San Francisco has typical daily highs of about 35°C and lows of about 26°C, with a 20% chance of rain on a given day.
San Francisco weather in autumnSeptember to November
High 28°CLow 17°CRain 20%
Autumn in San Francisco has typical daily highs of about 28°C and lows of about 17°C, with a 20% chance of rain on a given day.
When is the rainy season in San Francisco?
The rainy (wet) season in San Francisco runs from December to March, peaking in December with a 29% chance of rain on a given day. The dry season is April to June; May is the driest month, at 9%.
What time of year is San Francisco windiest?
Winds in San Francisco are highest in March, averaging 2.8 m/s (10 km/h), and lightest in January, at 2.3 m/s (8 km/h). The prevailing wind is from the S.
What is the average temperature in San Francisco year round?
The average temperature in San Francisco over the whole year is 22°C. June is the hottest month, with highs of about 35°C; January is the coldest, with lows of about 7°C.