Average data for 10 years
1 September
Sunday
+23°
+18°
2 September
Monday
+22°
+16°
3 September
Tuesday
+20°
+16°
4 September
Wednesday
+21°
+16°
5 September
Thursday
+23°
+18°
6 September
Friday
+23°
+17°
7 September
Saturday
+21°
+16°
8 September
Sunday
+20°
+16°
9 September
Monday
+22°
+18°
10 September
Tuesday
+22°
+16°
11 September
Wednesday
+19°
+15°
12 September
Thursday
+18°
+14°
13 September
Friday
+18°
+15°
14 September
Saturday
+18°
+14°
15 September
Sunday
+18°
+15°
16 September
Monday
+19°
+16°
17 September
Tuesday
+21°
+16°
18 September
Wednesday
+22°
+17°
19 September
Thursday
+22°
+17°
20 September
Friday
+20°
+15°
21 September
Saturday
+19°
+15°
22 September
Sunday
+21°
+17°
23 September
Monday
+22°
+17°
24 September
Tuesday
+22°
+18°
25 September
Wednesday
+24°
+19°
26 September
Thursday
+24°
+19°
27 September
Friday
+23°
+17°
28 September
Saturday
+18°
+15°
29 September
Sunday
+18°
+15°
30 September
Monday
+20°
+17°
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 21 degrees above zero. On average, San Francisco has 28 sunny and 2 partly cloudy days in September. September as well as August and October is considered the most comfortable time to visit San Francisco.