S
M
T
W
T
F
S
30
82°
67°
31
91°
71°
1
93°
70°
2
95°
71°
3
91°
70°
4
86°
68°
5
84°
64°
6
80°
61°
7
83°
66°
8
81°
62°
9
83°
62°
10
78°
57°
11
78°
57°
12
81°
62°
13
81°
61°
14
77°
61°
15
80°
60°
16
80°
61°
17
79°
60°
18
79°
60°
19
80°
61°
20
80°
61°
21
79°
60°
22
80°
60°
23
79°
59°
24
79°
59°
25
78°
58°
26
79°
59°
27
78°
58°
28
78°
58°
29
77°
57°
30
76°
56°
1
76°
55°
2
75°
56°
3
76°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Olympia Fields
Olympia Fields's September 2026 forecast shows daily high temperatures ranging from 75° to 95°, with overnight lows between 55° and 71°. The average high for September is 81° with an average low of 61°. 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 Olympia Fields. See also: October | November | December.
