S
M
T
W
T
F
S
30
75°
50°
31
81°
45°
1
72°
59°
2
67°
59°
3
67°
60°
4
79°
57°
5
73°
51°
6
71°
49°
7
74°
53°
8
71°
49°
9
70°
48°
10
70°
51°
11
71°
52°
12
70°
50°
13
70°
49°
14
69°
47°
15
69°
47°
16
71°
51°
17
73°
50°
18
64°
46°
19
67°
43°
20
68°
48°
21
72°
51°
22
72°
51°
23
71°
49°
24
71°
48°
25
70°
47°
26
72°
49°
27
71°
48°
28
70°
47°
29
68°
43°
30
60°
40°
1
59°
37°
2
61°
46°
3
68°
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 59° to 79°, with overnight lows between 37° and 60°. The average high for September is 69° with an average low of 49°. 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.
