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