Fallbrook Weather in September

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

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

September is in the fall / autumn in Fallbrook and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (82°F), whilst at night 15°C (60°F) is normal.

Fallbrook weather averages (imperial / metric)
Daytime temperature 28°C 82.4°F
Nightly temperature 15.4°C 59.7°F
Average temperature 21.7°C 71.1°F
Daily sunshine 9.8 hrs
Avg rainfall 8 mm 0.3 ins
Rainy days 2 days
Sea temperature 20.4°C 68.8°F
Humidity 66%
Windspeed 13kph 8 mph

On average September is the 4th driest month of the year in Fallbrook with around 8mm 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 Fallbrook

Fallbrook average temperature in September

September rainfall

Fallbrook average rain in September

September hourly sunshine

Fallbrook 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 Fallbrook 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

Fallbrook weather stats

Fallbrook weather statistics
Hottest month: August 29.4°C 84.9°F
Driest month: July 2mm 0.1ins
Sunniest month: August 11.1hrs
Coldest month: January 17.7°C 63.9°F
Wettest month: January 70mm 2.8ins
Map showing location of Fallbrook (33.37642, -117.25115) Fallbrook map pin © Google

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