Big Bear Lake Weather in September

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

The climate in Big Bear Lake during September can be summarized as mild and dry.

September is in the fall / autumn in Big Bear Lake and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 24°C (76°F), whilst at night 8°C (46°F) is normal.

Big Bear Lake weather averages (imperial / metric)
Daytime temperature 24.4°C 75.9°F
Nightly temperature 8°C 46.4°F
Average temperature 16.2°C 61.2°F
Daily sunshine 10.1 hrs
Avg rainfall 25 mm 1 ins
Rainy days 3 days
Sea temperature 19.3°C 66.8°F
Humidity 56%
Windspeed 14kph 9 mph

On average September is the 2nd driest month of the year in Big Bear Lake with around 25mm 1 inches of rain making it a dry time to visit. This rainfall is typically spread over 3 days, although this may vary considerably.

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

September temperatures in Big Bear Lake

Big Bear Lake average temperature in September

September rainfall

Big Bear Lake average rain in September

September hourly sunshine

Big Bear Lake 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 Big Bear Lake 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

Big Bear Lake weather stats

Big Bear Lake weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: June 14mm 0.6ins
Sunniest month: August 11.5hrs
Coldest month: January 8.2°C 46.8°F
Wettest month: January 88mm 3.5ins
Map showing location of Big Bear Lake (34.2439, -116.91142) Big Bear Lake map pin © Google

Locations nearby

Top United States locations