San Diego Weather in September

What's the weather like in San Diego (Texas) in September 2025?

The climate in San Diego during September can be summarized as hot, humid and wet.

September is in the fall / autumn in San Diego and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 33°C (92°F), whilst at night 21°C (70°F) is normal.

San Diego weather averages (imperial / metric)
Daytime temperature 33.3°C 91.9°F
Nightly temperature 21°C 69.7°F
Average temperature 27.1°C 80.8°F
Daily sunshine 8.1 hrs
Avg rainfall 124 mm 4.9 ins
Rainy days 8 days
Sea temperature 28.8°C 83.8°F
Humidity 72%
Windspeed 15.8kph 10 mph

On average September is the wettest month of the year in San Diego with around 124mm 4.9 inches of rain making it a wet time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.1 hours of sunshine per day.

September temperatures in San Diego

San Diego average temperature in September

September rainfall

San Diego average rain in September

September hourly sunshine

San Diego average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Diego in September 2025.

Other monthly averages

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UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

San Diego weather stats

San Diego weather statistics
Hottest month: August 35.6°C 96.1°F
Driest month: March 21mm 0.8ins
Sunniest month: July 10.4hrs
Coldest month: January 18.5°C 65.3°F
Wettest month: September 124mm 4.9ins
Map showing location of San Diego (27.76391, -98.2389) San Diego map pin © Google

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