S
M
T
W
T
F
S
30
59°
36°
31
58°
43°
1
57°
42°
2
58°
45°
3
58°
53°
4
58°
55°
5
58°
51°
6
58°
49°
7
59°
47°
8
58°
43°
9
56°
42°
10
57°
41°
11
57°
40°
12
55°
42°
13
54°
43°
14
56°
40°
15
52°
43°
16
55°
40°
17
50°
42°
18
52°
43°
19
53°
43°
20
50°
42°
21
52°
40°
22
53°
40°
23
51°
42°
24
50°
39°
25
48°
34°
26
47°
33°
27
46°
34°
28
46°
36°
29
47°
32°
30
45°
32°
1
45°
40°
2
49°
39°
3
50°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Nikiski
Nikiski's September 2026 forecast shows daily high temperatures ranging from 45° to 59°, with overnight lows between 32° and 55°. The average high for September is 53° with an average low of 41°. 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 Nikiski. See also: October | November | December.
