Click on a day for an hourly weather forecast
The weather in Juneau in September is very cold with temperatures between 3°C and 10°C, warm clothes are a must.
There’s going to be many days of rain during the month of September in Juneau.
Juneau should expect an average of 15 to 22 days of rain, so be sure to bring along a waterproof jacket to stay dry this month!
Our weather forecast can give you a great sense of what weather to expect in Juneau in September 2025.
If you’re planning to visit Juneau in the near future, we highly recommend that you review the 14 day weather forecast for Juneau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -10° | 8 | 3 | 23 | 531 mm | Awful | Juneau in January |
| February | -4° / -10° | 5 | 6 | 20 | 341 mm | Awful | Juneau in February |
| March | -1° / -9° | 5 | 5 | 22 | 328 mm | Awful | Juneau in March |
| April | 3° / -5° | 11 | 5 | 16 | 296 mm | Awful | Juneau in April |
| May | 9° / 0° | 12 | 15 | 4 | 242 mm | Awful | Juneau in May |
| June | 12° / 3° | 14 | 16 | 0 | 263 mm | Bad | Juneau in June |
| July | 14° / 5° | 12 | 19 | 0 | 258 mm | Ok | Juneau in July |
| August | 13° / 5° | 16 | 15 | 0 | 434 mm | Bad | Juneau in August |
| September | 10° / 3° | 17 | 13 | 0 | 475 mm | Bad | Juneau in September |
| October | 4° / -1° | 16 | 8 | 7 | 506 mm | Awful | Juneau in October |
| November | -2° / -6° | 9 | 2 | 21 | 493 mm | Awful | Juneau in November |
| December | -4° / -10° | 6 | 4 | 23 | 469 mm | Awful | Juneau in December |