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.
Temperatures
10° / 3°
Rainy Days
17
Snowy Days
0
Dry Days
13
Rainfall
475
mm
Sun Hours
5.7
Hrs
