San Diego Weather in September
United States · 30-year monthly averages
🌟 Great time to visit
September in San Diego is warm, with average daytime highs around 25°C (77°F) and nighttime lows near 19°C (66°F). Expect roughly 3mm of precipitation spread over about 1 rainy days, and rain is rare.
Avg high
25°C
77°F
Avg low
19°C
66°F
Rainfall
3mm
very dry
Rainy days
1
days with ≥1mm
🎒 What to pack
- light summer clothing
- sunscreen and sunglasses
September vs the rest of the year
FAQ
- How hot is San Diego in September?
- September in San Diego is warm, with average daytime highs around 25°C (77°F) and nighttime lows near 19°C (66°F). Expect roughly 3mm of precipitation spread over about 1 rainy days, and rain is rare.
- Does it rain a lot in San Diego in September?
- San Diego sees around 3mm of precipitation in September on average — very dry by global standards.
- Is September a good time to visit San Diego?
- September is one of the best months to visit San Diego — comfortable temperatures and manageable rainfall.