Weather in San Diego in September
San Diego, United States averages a high of 25°C (77°F) and low of 17.7°C (63.9°F) in September, with 1 rain days and 11.4 hours of daily sunshine. Travel score: 92.9/100 (Excellent). The best time to visit San Diego is July.
High
25°C77°F
Low
18°C64°F
🌧️
1
rain days
☀️
11.4
hrs/day sunshine
💧
78%
humidity
93— Excellent
September in San Diego is warm and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in San Diego?
How much does it rain in San Diego in September?
San Diego receives an average of 6.3mm of rainfall across 1 rainy days in September. The annual total is 290.5mm.
What should I pack for San Diego in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 25°C
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31