South San Francisco Weather Year-Round — Best Time to Visit
South San Francisco, United States has mild weather year-round. The best time to visit is September (score: 90/100). Annual average high: 17.5°C, total rainfall: 491mm.
When is the best time to visit South San Francisco?
90
September is the best month to visit South San Francisco with a travel score of 90/100 (Excellent).
Expect highs of 21.8°C, 1 rain days, and 11.6 hours of daily sunshine.
View September weather details →Travel Score by Month
62
Jan
66
Feb
71
Mar
77
Apr
81
May
86
Jun
88
Jul
89
Aug
90
Sep
86
Oct
73
Nov
62
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in South San Francisco each month?
17.5°C
Avg High
10.7°C
Avg Low
491mm
Annual Rain
How much rain does South San Francisco get?
South San Francisco receives 491mm of rain annually. The wettest month is typically December with 101mm, while July is the driest.
What is the weather like each month in South San Francisco?
January
62
14°C
Low: 8°C
9 rain days
Good
February
66
14°C
Low: 8°C
9 rain days
Good
March
71
15°C
Low: 9°C
8 rain days
Good
April
77
16°C
Low: 10°C
5 rain days
Good
May
81
18°C
Low: 11°C
3 rain days
Excellent
June
86
20°C
Low: 12°C
1 rain days
Excellent
July
88
21°C
Low: 13°C
0 rain days
Excellent
August
89
21°C
Low: 14°C
0 rain days
Excellent
September
Best time to visit90
22°C
Low: 14°C
1 rain days
Excellent
October
86
20°C
Low: 13°C
3 rain days
Excellent
November
73
16°C
Low: 10°C
6 rain days
Good
December
62
14°C
Low: 8°C
9 rain days
Good
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Data based on 1994–2024 averages · Last updated: 2024-12-31