Costa Mesa Weather in September

What's the weather like in Costa Mesa (California) in September 2024?

The climate in Costa Mesa during September can be summarized as warm, humid and very dry.

September is in the fall / autumn in Costa Mesa and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 25°C (76°F), whilst at night 17°C (62°F) is normal.

Costa Mesa weather averages (imperial / metric)
Daytime temperature 24.6°C 76.2°F
Nightly temperature 16.5°C 61.6°F
Average temperature 20.5°C 68.9°F
Daily sunshine 9.8 hrs
Avg rainfall 6 mm 0.3 ins
Rainy days 1 days
Sea temperature 20.4°C 68.8°F
Humidity 70%
Windspeed 12.2kph 8 mph

On average September is the 6th driest month of the year in Costa Mesa with around 6mm 0.3 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 Costa Mesa

Costa Mesa average temperature in September

September rainfall

Costa Mesa average rain in September

September hourly sunshine

Costa Mesa 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 Costa Mesa in September 2024.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Costa Mesa weather stats

Costa Mesa weather statistics
Hottest month: August 24°C 75.2°F
Driest month: July 1mm 0ins
Sunniest month: August 11.5hrs
Coldest month: January 18°C 64.4°F
Wettest month: January 64mm 2.5ins
Map showing location of Costa Mesa (33.64113, -117.91867) Costa Mesa map pin © Google

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