In general the best time to visit San Francisco is probably September, when the weather is usually great. The hottest months are July, August, September, while the coldest months are January, February, December.
April, May, June, July, August, September, October usually has good weather. Average maximum temperature reaches +75°F during August.
In January, February, March, November, December the weather is average. Expect around 37 rainy days, and the precipitation amounts to approximately 115 mm in December.
Climate in San Francisco
Here is the detailed breakdown of the climate in San Francisco for each month:
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Maximum Temperature
+75°F
+75°F
+79°F
+86°F
+91°F
+97°F
+95°F
+93°F
+99°F
+95°F
+81°F
+73°F
Average Maximum Temperature
+57°F
+61°F
+63°F
+66°F
+70°F
+73°F
+73°F
+75°F
+75°F
+72°F
+63°F
+57°F
Minimum Temperature
+30°F
+30°F
+36°F
+39°F
+45°F
+46°F
+50°F
+50°F
+48°F
+45°F
+36°F
+25°F
Humidity, %
82
80
79
77
78
79
82
83
81
78
80
80
Rain, mm
109
111
85
37
16
3
0
1
4
29
64
115
Snow, mm
0
0
0
0
0
0
0
0
0
0
0
0
Average wind speed, m/s
2
2
2
3
3
3
2
2
2
2
2
2
Sunny Days
5
5
6
8
10
12
7
7
10
11
8
7
Cloud Days
18
15
17
18
19
18
24
24
19
18
17
16
Rainy Days
8
8
8
4
2
0
0
0
1
2
5
8
Snowy Days
0
0
0
0
0
0
0
0
0
0
0
0
Average Temperature
Here are the average maximum and minimum temperatures in San Francisco during the whole year:
The hottest month in San Francisco is September with average maximum temperature going up to +75°F. The coldest month is January with the lowest temperatures of +45°F.
Humidity
The temperature feels different depending on humidity. Here is how humidity in San Francisco looks throughout the year, in %:
The most humid month in San Francisco is August with average humidity going up to 83%. The least humid month is April with an average humidity of 77%.
Rain
Amount of rainfall in mm. in San Francisco during the whole year based on historical data:
The sunniest and driest month is June with approximately 12 sunny days and a total precipitation of around 3 mm. The rainiest and wettest month is December with approximately 8 rainy days and 115 mm of total precipitation.
FAQ
Frequently asked questions about the weather in San Francisco:
What is the hottest month in San Francisco?
The hottest month in San Francisco is September with average maximum temperature of +75°F.
What is the coldest month in San Francisco?
The coldest month in San Francisco is January with minimum temperatures of +45°F.
Is San Francisco worth visiting in winter?
Winter in San Francisco could be a good time to visit, as the weather is generally ok.
When does it rain the least in San Francisco?
if you're looking to visit San Francisco when it rains the least, you should plan your trip for December, February, January. During this time, rainfall is rare with the driest month being July with only 0 mm of rain.
For this page, we’ve looked at the typical weather in San Francisco, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.