S
M
T
W
T
F
S
30
33°
29°
31
31°
27°
1
38°
25°
2
35°
31°
3
36°
31°
4
34°
30°
5
30°
25°
6
29°
24°
7
26°
23°
8
29°
22°
9
27°
22°
10
25°
20°
11
23°
11°
12
16°
8°
13
21°
11°
14
21°
12°
15
22°
10°
16
25°
12°
17
25°
19°
18
20°
10°
19
13°
10°
20
15°
5°
21
12°
7°
22
N/A
23
30°
16°
24
23°
14°
25
21°
6°
26
13°
7°
27
13°
6°
28
16°
6°
29
17°
10°
30
11°
4°
1
5°
0°
2
11°
-1°
3
7°
-6°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Alert
Alert's September 2026 forecast shows daily high temperatures ranging from 5° to 30°, with overnight lows between -6° and 16°. The average high for September is 15° with an average low of 6°. 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 Alert. See also: October | November | December.
