S
M
T
W
T
F
S
30
91°
65°
31
96°
67°
1
98°
72°
2
98°
72°
3
98°
73°
4
99°
72°
5
99°
73°
6
87°
64°
7
86°
60°
8
91°
58°
9
92°
69°
10
80°
67°
11
86°
66°
12
91°
69°
13
87°
61°
14
85°
58°
15
98°
66°
16
93°
73°
17
98°
71°
18
97°
71°
19
93°
69°
20
91°
69°
21
70°
64°
22
74°
58°
23
67°
59°
24
71°
58°
25
74°
56°
26
76°
56°
27
76°
50°
28
81°
47°
29
82°
48°
30
91°
61°
1
89°
61°
2
67°
46°
3
72°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Effingham
Effingham's September 2026 forecast shows daily high temperatures ranging from 67° to 89°, with overnight lows between 45° and 61°. The average high for September is 76° with an average low of 51°. 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 Effingham. See also: October | November | December.
