The temperatures in Big Bear in September are quite cold with temperatures between 9°C and 20°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Big Bear during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Big Bear in September 2025.
If you’re planning to visit Big Bear in the near future, we highly recommend that you review the 14 day weather forecast for Big Bear before you arrive.
Temperatures
20° / 9°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
72
mm
Sun Hours
9.4
Hrs
