S
M
T
W
T
F
S
30
85°
66°
31
87°
63°
1
87°
59°
2
80°
62°
3
79°
66°
4
85°
67°
5
85°
57°
6
84°
57°
7
78°
64°
8
81°
63°
9
84°
58°
10
83°
62°
11
75°
58°
12
78°
55°
13
74°
53°
14
74°
53°
15
75°
56°
16
75°
59°
17
80°
61°
18
81°
61°
19
81°
60°
20
76°
59°
21
80°
60°
22
79°
51°
23
82°
51°
24
78°
50°
25
69°
50°
26
71°
49°
27
79°
58°
28
78°
57°
29
80°
49°
30
Hist. Avg.
74°
53°
1
Hist. Avg.
74°
52°
2
Hist. Avg.
73°
52°
3
Hist. Avg.
73°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Edwardsville
Edwardsville's September 2026 forecast shows daily high temperatures ranging from 69° to 87°, with overnight lows between 49° and 67°. The average high for September is 79° with an average low of 58°. 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 Edwardsville. See also: October | November | December.
