Lake Arrowhead Weather in September

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

The climate in Lake Arrowhead during September can be summarized as warm and dry.

September is in the fall / autumn in Lake Arrowhead and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 29°C (85°F), whilst at night 12°C (53°F) is normal.

Lake Arrowhead weather averages (imperial / metric)
Daytime temperature 29.2°C 84.6°F
Nightly temperature 11.8°C 53.2°F
Average temperature 20.5°C 68.9°F
Daily sunshine 10.4 hrs
Avg rainfall 12 mm 0.5 ins
Rainy days 2 days
Sea temperature 19.6°C 67.3°F
Humidity 57%
Windspeed 13.3kph 8 mph

On average September is the 3rd driest month of the year in Lake Arrowhead with around 12mm 0.5 inches of rain making it a dry time to visit. This rainfall is typically spread over 2 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.4 hours of sunshine per day.

September temperatures in Lake Arrowhead

Lake Arrowhead average temperature in September

September rainfall

Lake Arrowhead average rain in September

September hourly sunshine

Lake Arrowhead 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 Lake Arrowhead 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

Lake Arrowhead weather stats

Lake Arrowhead weather statistics
Hottest month: July 33.1°C 91.6°F
Driest month: June 4mm 0.2ins
Sunniest month: August 11.8hrs
Coldest month: December 12.8°C 55°F
Wettest month: January 74mm 2.9ins
Map showing location of Lake Arrowhead (34.24834, -117.18921) Lake Arrowhead map pin © Google

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