Pasadena Weather in September

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

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

September is in the fall / autumn in Pasadena and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 30°C (85°F), whilst at night 16°C (61°F) is normal.

Pasadena weather averages (imperial / metric)
Daytime temperature 29.5°C 85.1°F
Nightly temperature 16.3°C 61.3°F
Average temperature 22.9°C 73.2°F
Daily sunshine 10.1 hrs
Avg rainfall 9 mm 0.4 ins
Rainy days 2 days
Sea temperature 18.6°C 65.5°F
Humidity 66%
Windspeed 12.2kph 8 mph

On average September is the 5th driest month of the year in Pasadena with around 9mm 0.4 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.1 hours of sunshine per day.

September temperatures in Pasadena

Pasadena average temperature in September

September rainfall

Pasadena average rain in September

September hourly sunshine

Pasadena 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 Pasadena 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

Pasadena weather stats

Pasadena weather statistics
Hottest month: August 30.6°C 87.1°F
Driest month: July 1mm 0ins
Sunniest month: August 11.7hrs
Coldest month: January 19.4°C 66.9°F
Wettest month: January 86mm 3.4ins
Map showing location of Pasadena (34.14778, -118.14452) Pasadena map pin © Google

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