Carlsbad Weather in September

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

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

September is in the fall / autumn in Carlsbad and is typically the 3rd 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.

Carlsbad weather averages (imperial / metric)
Daytime temperature 26.5°C 79.6°F
Nightly temperature 16.9°C 62.3°F
Average temperature 21.7°C 71°F
Daily sunshine 9.5 hrs
Avg rainfall 6 mm 0.2 ins
Rainy days 1 days
Sea temperature 20.4°C 68.8°F
Humidity 70%
Windspeed 13.1kph 8 mph

On average September is the 4th driest month of the year in Carlsbad with around 6mm 0.2 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 9.5 hours of sunshine per day.

September temperatures in Carlsbad

Carlsbad average temperature in September

September rainfall

Carlsbad average rain in September

September hourly sunshine

Carlsbad 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 Carlsbad 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

Carlsbad weather stats

Carlsbad weather statistics
Hottest month: August 27.1°C 80.8°F
Driest month: July 1mm 0ins
Sunniest month: August 10.9hrs
Coldest month: December 18.4°C 65.1°F
Wettest month: January 63mm 2.5ins
Map showing location of Carlsbad (33.15809, -117.35059) Carlsbad map pin © Google

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