San Diego weather in September
September in San Diego averages 77°F by day and 65°F at night, with 0.2 inches of precipitation. It is the 2nd-warmest and 9th-wettest month of the year here.
- Average high
- 77°F-0° vs August
- Average low
- 65°F0 nights below freezing
- Precipitation
- 0.2 in0 days with 0.1 in. or more
- Snow
- 0.0 in1 days at 90°F+
Is September a good time to visit San Diego?
Yes. September is one of the most comfortable months in San Diego by our rule (highs of 62 to 86°F, lows of 42°F or more and under 4.5 inches of precipitation). The most comfortable months overall are January to December.
Get outside in San Diego in September
September is made for being outside. Try San Diego Zoo, SeaWorld San Diego, Balboa Park, Cabrillo National Monument. All things to do in San Diego.
On September 15 the sun rises at 6:32 am and sets at 6:54 pm, giving 12h 22m of daylight. Daylight all year.
What to pack for San Diego in September
- Summer clothes, with a light layer for air conditioning
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| San Diego | 77°F | 65°F | 0.2 in | |
| Chula Vista, CA | 8 mi | 77°F | 65°F | 0.2 in |
| El Cajon, CA | 15 mi | 87°F | 62°F | 0.1 in |
| Escondido, CA | 28 mi | 87°F | 63°F | 0.2 in |
| San Marcos, CA | 30 mi | 76°F | 64°F | 0.1 in |
| Carlsbad, CA | 32 mi | 76°F | 64°F | 0.1 in |
| Vista, CA | 34 mi | 76°F | 64°F | 0.1 in |
Frequently asked questions
What is the weather like in San Diego in September?
In September, San Diego averages a high of 77°F and a low of 65°F, with 0.2 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit San Diego?
Yes. September is one of San Diego's most comfortable months by our rule: highs between 62°F and 86°F, lows of 42°F or more and modest rain.
Does it snow in San Diego in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: San Diego in August and San Diego in October. All twelve months: San Diego weather by month.
NOAA NCEI 1991-2020 climate normals, station North Island NAS, CA, 2.7 miles from the city center.