S
M
T
W
T
F
S
30
77°
63°
31
78°
61°
1
77°
61°
2
77°
60°
3
78°
61°
4
78°
61°
5
79°
65°
6
78°
63°
7
76°
63°
8
77°
61°
9
75°
58°
10
76°
58°
11
75°
57°
12
75°
58°
13
76°
58°
14
74°
62°
15
80°
65°
16
81°
65°
17
80°
64°
18
80°
55°
19
78°
54°
20
72°
54°
21
70°
60°
22
72°
62°
23
77°
61°
24
76°
62°
25
77°
52°
26
76°
50°
27
67°
50°
28
66°
51°
29
67°
51°
30
66°
56°
1
66°
57°
2
Hist. Avg.
70°
52°
3
Hist. Avg.
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alsip
Alsip's September 2026 forecast shows daily high temperatures ranging from 66° to 81°, with overnight lows between 50° and 65°. The average high for September is 75° with an average low of 59°. 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 Alsip. See also: October | November | December.
