Click on a day for an hourly weather forecast
The temperatures in Alaska in September are quite cold with temperatures between 7°C and 12°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Alaska 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 Alaska in September 2025.
If you’re planning to visit Alaska in the near future, we highly recommend that you review the 14 day weather forecast for Alaska before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -6° / -10° | 6 | 13 | 12 | 41 mm | Awful | Alaska in January |
| February | -4° / -9° | 6 | 8 | 15 | 51 mm | Awful | Alaska in February |
| March | -2° / -7° | 6 | 11 | 14 | 43 mm | Awful | Alaska in March |
| April | 4° / -1° | 6 | 18 | 7 | 29 mm | Awful | Alaska in April |
| May | 10° / 5° | 2 | 28 | 1 | 27 mm | Ok | Alaska in May |
| June | 14° / 8° | 3 | 27 | 0 | 42 mm | Good | Alaska in June |
| July | 16° / 11° | 5 | 26 | 0 | 66 mm | Good | Alaska in July |
| August | 15° / 10° | 7 | 24 | 0 | 100 mm | Ok | Alaska in August |
| September | 12° / 7° | 6 | 24 | 0 | 106 mm | Ok | Alaska in September |
| October | 6° / 3° | 6 | 22 | 3 | 87 mm | Awful | Alaska in October |
| November | -2° / -5° | 6 | 14 | 11 | 59 mm | Awful | Alaska in November |
| December | -5° / -8° | 8 | 9 | 15 | 61 mm | Awful | Alaska in December |