S
M
T
W
T
F
S
30
84°
61°
31
83°
59°
1
84°
58°
2
82°
58°
3
81°
57°
4
81°
57°
5
82°
61°
6
81°
63°
7
85°
57°
8
82°
59°
9
83°
62°
10
84°
63°
11
84°
63°
12
87°
62°
13
86°
57°
14
80°
62°
15
85°
62°
16
84°
61°
17
85°
60°
18
86°
53°
19
80°
59°
20
82°
52°
21
85°
51°
22
77°
50°
23
77°
56°
24
83°
50°
25
82°
49°
26
Hist. Avg.
79°
52°
27
Hist. Avg.
79°
52°
28
Hist. Avg.
78°
51°
29
Hist. Avg.
78°
51°
30
Hist. Avg.
78°
50°
1
Hist. Avg.
77°
50°
2
Hist. Avg.
77°
50°
3
Hist. Avg.
77°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Fairview Heights
Fairview Heights's September 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 49° and 63°. The average high for September is 83° with an average low of 58°. 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 Fairview Heights. See also: October | November | December.
