S
M
T
W
T
F
S
30
81°
69°
31
91°
72°
1
94°
77°
2
96°
76°
3
93°
75°
4
95°
73°
5
84°
68°
6
82°
65°
7
82°
69°
8
88°
72°
9
88°
70°
10
79°
67°
11
78°
62°
12
78°
63°
13
77°
63°
14
78°
62°
15
77°
60°
16
81°
65°
17
80°
64°
18
73°
64°
19
77°
64°
20
78°
63°
21
77°
64°
22
76°
62°
23
73°
61°
24
74°
59°
25
77°
61°
26
77°
56°
27
67°
52°
28
65°
49°
29
66°
52°
30
65°
50°
1
64°
51°
2
68°
58°
3
67°
57°
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 64° to 96°, with overnight lows between 49° and 76°. The average high for September is 78° with an average low of 62°. 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.
