Weather · September
San Diego weather in September
Average highs of 81°F, lows of 64°F and 0.20 in of rain, from 30 years of weather records.
September is San Diego’s 2nd warmest month, with average highs of 81°F and lows of 64°F. That is 1° cooler than August, and 8° above the yearly average high.
- Average high
- 81°F
- Average low
- 64°F
- Precipitation
- 0.20 in
- Wet days
- 1
- Sunrise · sunset
- 6:32 AM · 6:55 PM
What to wear in September
- Warm days: shorts and T-shirts.
What September weather is good for
What’s on in San Diego in September
Guides for this month: Halloween in San Diego.
See all upcoming events and school days off.
September compared with the months around it
Planning a trip? See the best time to visit San Diego and today’s forecast.
Questions
How hot does it get in San Diego in September?
Average highs are 81°F and average lows 64°F, for a daily mean of 73°F. Individual days run hotter or colder than these 30-year averages.
Does it rain in San Diego in September?
September averages 0.20 in of precipitation over about 1 days with at least 0.01 in. It is the 9th wettest month of the year.
What time is sunset in San Diego in September?
Around mid-September the sun rises about 6:32 AM and sets about 6:55 PM, for roughly 12.4 hours of daylight.
Is September a good time to visit San Diego?
The mildest months for visiting are June, July, August. September is warm, with Halloween events.
NOAA U.S. Climate Normals 1991–2020, San Diego Montgomery Fld station (1.5 mi from downtown). Sunrise and sunset are calculated for September 15 at the city’s coordinates.