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The weather in Sierra Nevada in September is very cold with temperatures between 1°C and 10°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Sierra Nevada 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.
You can expect a few days of snow in Sierra Nevada during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Sierra Nevada.
Our weather forecast can give you a great sense of what weather to expect in Sierra Nevada in September 2026.
If you’re planning to visit Sierra Nevada in the near future, we highly recommend that you review the 14 day weather forecast for Sierra Nevada before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 21° / 8° | 1 | 30 | 0 | 16 mm | Good | Sierra Nevada in January |
| February | 21° / 8° | 1 | 27 | 0 | 26 mm | Good | Sierra Nevada in February |
| March | 18° / 7° | 2 | 29 | 0 | 20 mm | Good | Sierra Nevada in March |
| April | 13° / 4° | 2 | 27 | 1 | 26 mm | Ok | Sierra Nevada in April |
| May | 9° / 2° | 3 | 26 | 2 | 28 mm | Bad | Sierra Nevada in May |
| June | 5° / -1° | 4 | 19 | 8 | 37 mm | Awful | Sierra Nevada in June |
| July | 4° / -3° | 5 | 17 | 10 | 34 mm | Awful | Sierra Nevada in July |
| August | 6° / -1° | 4 | 20 | 7 | 33 mm | Awful | Sierra Nevada in August |
| September | 10° / 1° | 3 | 24 | 4 | 26 mm | Bad | Sierra Nevada in September |
| October | 13° / 2° | 2 | 26 | 2 | 23 mm | Bad | Sierra Nevada in October |
| November | 17° / 4° | 2 | 28 | 0 | 21 mm | Good | Sierra Nevada in November |
| December | 19° / 7° | 1 | 29 | 0 | 17 mm | Good | Sierra Nevada in December |