Seal Beach Weather in September

What's the weather like in Seal Beach (California) in September 2025?

The climate in Seal Beach during September can be summarized as warm and very dry.

September is in the fall / autumn in Seal Beach and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (80°F), whilst at night 17°C (62°F) is normal.

Seal Beach weather averages (imperial / metric)
Daytime temperature 26.9°C 80.4°F
Nightly temperature 16.5°C 61.7°F
Average temperature 21.7°C 71.1°F
Daily sunshine 9.8 hrs
Avg rainfall 4 mm 0.1 ins
Rainy days 1 days
Sea temperature 19.6°C 67.2°F
Humidity 70%
Windspeed 11.9kph 7 mph

On average September is the 4th driest month of the year in Seal Beach with around 4mm 0.1 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 9.8 hours of sunshine per day.

September temperatures in Seal Beach

Seal Beach average temperature in September

September rainfall

Seal Beach average rain in September

September hourly sunshine

Seal Beach 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 Seal Beach in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Seal Beach weather stats

Seal Beach weather statistics
Hottest month: August 27.4°C 81.3°F
Driest month: July 1mm 0ins
Sunniest month: August 11.6hrs
Coldest month: January 19°C 66.2°F
Wettest month: January 60mm 2.4ins
Map showing location of Seal Beach (33.74141, -118.10479) Seal Beach map pin © Google

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