Weather in South San Francisco in September
South San Francisco, United States averages a high of 21.8°C (71.2°F) and low of 13.8°C (56.8°F) in September, with 1 rain days and 11.6 hours of daily sunshine. Travel score: 89.7/100 (Excellent). The best time to visit South San Francisco is September.
High
22°C71°F
Low
14°C57°F
🌧️
1
rain days
☀️
11.6
hrs/day sunshine
💧
78%
humidity
90— Excellent
September in South San Francisco is mild and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in South San Francisco?
How much does it rain in South San Francisco in September?
South San Francisco receives an average of 2.2mm of rainfall across 1 rainy days in September. The annual total is 491.2mm.
What should I pack for South San Francisco in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 22°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
🎉Visiting United States in September?
Don't miss any public holidays — check before you book!
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Data based on 1994–2024 averages · Last updated: 2024-12-31