S
M
T
W
T
F
S
30
57°
50°
31
55°
50°
1
60°
40°
2
61°
38°
3
62°
34°
4
65°
40°
5
64°
48°
6
60°
54°
7
61°
54°
8
60°
52°
9
58°
50°
10
60°
48°
11
57°
50°
12
57°
49°
13
59°
50°
14
56°
47°
15
57°
49°
16
54°
47°
17
52°
45°
18
51°
44°
19
51°
44°
20
52°
43°
21
50°
41°
22
50°
41°
23
51°
43°
24
50°
44°
25
50°
42°
26
51°
42°
27
50°
41°
28
53°
44°
29
50°
45°
30
54°
44°
1
51°
47°
2
50°
47°
3
50°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Juneau
Juneau's September 2026 forecast shows daily high temperatures ranging from 50° to 65°, with overnight lows between 34° and 54°. The average high for September is 55° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Juneau. See also: October | November | December.
