S
M
T
W
T
F
S
30
91°
65°
31
96°
67°
1
98°
72°
2
99°
72°
3
99°
73°
4
99°
71°
5
95°
68°
6
92°
63°
7
90°
67°
8
94°
70°
9
94°
71°
10
92°
65°
11
85°
62°
12
85°
61°
13
83°
62°
14
84°
60°
15
82°
55°
16
82°
61°
17
83°
61°
18
80°
60°
19
77°
60°
20
81°
59°
21
81°
60°
22
82°
59°
23
81°
55°
24
79°
58°
25
80°
58°
26
79°
53°
27
71°
48°
28
71°
46°
29
69°
47°
30
71°
47°
1
70°
48°
2
73°
54°
3
69°
53°
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 69° to 99°, with overnight lows between 46° and 73°. The average high for September is 83° with an average low of 60°. 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.
