Click on a day for an hourly weather forecast
The temperatures in Sitka in September are quite cold with temperatures between 8°C and 13°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Sitka. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Sitka in September 2025.
If you’re planning to visit Sitka in the near future, we highly recommend that you review the 14 day weather forecast for Sitka before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -2° | 18 | 4 | 10 | 501 mm | Awful | Sitka in January |
| February | 1° / -3° | 13 | 5 | 12 | 360 mm | Awful | Sitka in February |
| March | 3° / -2° | 13 | 4 | 16 | 336 mm | Awful | Sitka in March |
| April | 6° / 1° | 15 | 10 | 6 | 295 mm | Awful | Sitka in April |
| May | 10° / 5° | 12 | 19 | 0 | 210 mm | Bad | Sitka in May |
| June | 13° / 8° | 13 | 17 | 0 | 227 mm | Bad | Sitka in June |
| July | 15° / 10° | 12 | 19 | 0 | 224 mm | Ok | Sitka in July |
| August | 15° / 10° | 14 | 17 | 0 | 354 mm | Ok | Sitka in August |
| September | 13° / 8° | 14 | 16 | 0 | 441 mm | Bad | Sitka in September |
| October | 8° / 4° | 16 | 15 | 0 | 487 mm | Bad | Sitka in October |
| November | 3° / 0° | 17 | 6 | 8 | 534 mm | Awful | Sitka in November |
| December | 1° / -2° | 16 | 5 | 11 | 467 mm | Awful | Sitka in December |