S
M
T
W
T
F
S
30
91°
64°
31
88°
62°
1
82°
64°
2
83°
58°
3
80°
57°
4
81°
61°
5
81°
62°
6
87°
62°
7
88°
62°
8
83°
61°
9
84°
61°
10
87°
55°
11
79°
54°
12
79°
54°
13
80°
55°
14
79°
60°
15
85°
60°
16
84°
59°
17
84°
59°
18
78°
52°
19
77°
50°
20
75°
52°
21
74°
54°
22
77°
56°
23
81°
57°
24
82°
58°
25
83°
49°
26
82°
48°
27
74°
49°
28
71°
48°
29
72°
48°
30
72°
47°
1
Hist. Avg.
73°
49°
2
Hist. Avg.
73°
48°
3
Hist. Avg.
72°
48°
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 71° to 91°, with overnight lows between 47° and 64°. The average high for September is 81° with an average low of 56°. 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.
