Annual mean 14°C · wettest around March · prevailing wind W
Warmest
20.1 °C
Coldest
12.3 °C
Wettest
90%
Windiest
5.0 m/s
Prevailing
W
4.1 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 Francisco over the whole year is 14°C. September is the hottest month, with highs of about 20°C; February is the coldest, with lows of about 9°C. The rainy (wet) season in San Francisco 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 43%. Winds in San Francisco are highest in June, 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 Francisco come in October, when the sky is typically 36% covered; January is the cloudiest month, at 51%.
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
13°C
9°C
10°C
88%
51%
2.8 m/s
12
0
73
February
13°C
9°C
10°C
88%
37%
3.2 m/s
15
0
69
March
14°C
9°C
11°C
88%
49%
3.3 m/s
14
0
72
April
15°C
10°C
12°C
87%
41%
3.4 m/s
26
2
77
May
16°C
12°C
14°C
86%
44%
3.6 m/s
33
4
79
June
18°C
13°C
16°C
43%
38%
3.7 m/s
39
9
76
July
18°C
14°C
17°C
51%
47%
3.5 m/s
52
12
74
August
19°C
15°C
18°C
50%
48%
3.1 m/s
68
14
72
September
20°C
14°C
18°C
59%
41%
2.8 m/s
66
12
74
October
19°C
13°C
17°C
81%
36%
2.5 m/s
60
9
76
November
15°C
10°C
13°C
87%
37%
2.5 m/s
29
1
81
December
13°C
9°C
11°C
88%
46%
2.7 m/s
13
0
74
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 13°C at their warmest in January, its coolest month, and 20°C in September, its warmest; the coolest hours of the day run from 9°C to 15°C through the year, and the average temperature over the year is 14°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 Francisco weather in winterDecember to February
High 13°CLow 9°CRain 88%
Winter in San Francisco has typical daily highs of about 13°C and lows of about 9°C, with a 88% chance of rain on a given day.
San Francisco weather in springMarch to May
High 15°CLow 10°CRain 87%
Spring in San Francisco has typical daily highs of about 15°C and lows of about 10°C, with a 87% chance of rain on a given day.
San Francisco weather in summerJune to August
High 18°CLow 14°CRain 48%
Summer in San Francisco has typical daily highs of about 18°C and lows of about 14°C, with a 48% chance of rain on a given day.
San Francisco weather in autumnSeptember to November
High 18°CLow 12°CRain 76%
Autumn in San Francisco has typical daily highs of about 18°C and lows of about 12°C, with a 76% chance of rain on a given day.
When is the rainy season in San Francisco?
The rainy (wet) season in San Francisco 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 43%.
What time of year is San Francisco windiest?
Winds in San Francisco are highest in June, 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 Francisco year round?
The average temperature in San Francisco over the whole year is 14°C. September is the hottest month, with highs of about 20°C; February is the coldest, with lows of about 9°C.