Alaska weather in September
The state broadly agrees with itself in September: afternoons run 56° in Juneau and 51° in Denali National Park, with everywhere else in between.
Based on 4 weather stations. Four stations for a state that would swallow most of the map — the Arctic north and the Aleutians sit far outside what these rows can honestly say.
Southcentral
Highs near 56°, nights around 43°, and 3.1 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Anchorage | 56° / 43° | 8 | Tundra turns red, and the peaks get their first dusting. |
Southeast & the Inside Passage
Highs near 56°, nights around 44°, and 9.2 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Juneau | 56° / 44° | 17 | Wettest month of the year, and the cruise ships leave. |
The Interior
Highs 51–55°, nights 31–36°, and up to 5.0 in of snow in a typical September.
| Place | Highs / lows | Wet days | Snow | The short version |
|---|---|---|---|---|
| Fairbanks | 55° / 36° | 1 | 2.3 in | Gold everywhere, dark nights back, and no bugs left. |
| Denali National Park | 51° / 31° | 2 | 5.0 in | The tundra goes gold and the gates start closing. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.