Average data for 10 years
1 September
Monday
+24°
+13°
2 September
Tuesday
+24°
+13°
3 September
Wednesday
+23°
+13°
4 September
Thursday
+23°
+13°
5 September
Friday
+24°
+13°
6 September
Saturday
+24°
+13°
7 September
Sunday
+24°
+13°
8 September
Monday
+24°
+13°
9 September
Tuesday
+23°
+13°
10 September
Wednesday
+22°
+13°
11 September
Thursday
+23°
+13°
12 September
Friday
+23°
+13°
13 September
Saturday
+22°
+13°
14 September
Sunday
+22°
+13°
15 September
Monday
+21°
+13°
16 September
Tuesday
+21°
+13°
17 September
Wednesday
+22°
+13°
18 September
Thursday
+23°
+14°
19 September
Friday
+23°
+13°
20 September
Saturday
+23°
+13°
21 September
Sunday
+23°
+13°
22 September
Monday
+23°
+12°
23 September
Tuesday
+23°
+12°
24 September
Wednesday
+23°
+13°
25 September
Thursday
+23°
+13°
26 September
Friday
+23°
+13°
27 September
Saturday
+23°
+13°
28 September
Sunday
+23°
+13°
29 September
Monday
+22°
+13°
30 September
Tuesday
+22°
+12°
Cities with similar weather in September
Australia
Sydney
Canada
Toronto
Canada
Vancouver
Italy
Genoa
United States
Boston
September in San Francisco is the warmest month of the year. In September, the weather in San Francisco is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, San Francisco has 20 sunny, 9 partly cloudy, and 1 rainy day in September. The rains are usually light. September as well as June, July, and August is considered the most comfortable time to visit San Francisco.