S
M
T
W
T
F
S
30
93°
64°
31
98°
63°
1
100°
73°
2
100°
73°
3
99°
74°
4
100°
71°
5
96°
71°
6
94°
67°
7
92°
69°
8
89°
65°
9
88°
68°
10
87°
64°
11
84°
59°
12
82°
59°
13
83°
60°
14
80°
58°
15
81°
62°
16
83°
63°
17
83°
63°
18
84°
62°
19
83°
63°
20
84°
63°
21
83°
62°
22
83°
62°
23
82°
61°
24
83°
61°
25
83°
60°
26
82°
59°
27
83°
60°
28
82°
60°
29
81°
59°
30
81°
59°
1
80°
58°
2
80°
59°
3
79°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Edwardsville
Edwardsville's September 2026 forecast shows daily high temperatures ranging from 79° to 100°, with overnight lows between 58° and 74°. The average high for September is 86° with an average low of 63°. 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.
