Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -10° / -18° | 1 | 7 | 22 | 39 mm | Awful | Big Bear in January |
| February | -9° / -17° | 1 | 7 | 20 | 37 mm | Awful | Big Bear in February |
| March | 1° / -7° | 6 | 9 | 18 | 63 mm | Awful | Big Bear in March |
| April | 8° / -1° | 5 | 13 | 11 | 81 mm | Bad | Big Bear in April |
| May | 17° / 6° | 9 | 21 | 2 | 125 mm | Bad | Big Bear in May |
| June | 23° / 12° | 7 | 23 | 0 | 149 mm | Good | Big Bear in June |
| July | 26° / 14° | 7 | 24 | 0 | 101 mm | Good | Big Bear in July |
| August | 25° / 13° | 5 | 26 | 0 | 95 mm | Perfect | Big Bear in August |
| September | 20° / 9° | 4 | 26 | 0 | 72 mm | Good | Big Bear in September |
| October | 10° / 3° | 6 | 18 | 6 | 92 mm | Bad | Big Bear in October |
| November | 1° / -5° | 2 | 12 | 15 | 41 mm | Awful | Big Bear in November |
| December | -7° / -13° | 1 | 9 | 21 | 49 mm | Awful | Big Bear in December |