S
M
T
W
T
F
S
30
90°
66°
31
90°
66°
1
89°
66°
2
90°
67°
3
90°
66°
4
89°
66°
5
90°
65°
6
90°
66°
7
87°
64°
8
81°
62°
9
80°
63°
10
84°
62°
11
86°
63°
12
87°
63°
13
86°
60°
14
73°
56°
15
74°
60°
16
75°
59°
17
85°
55°
18
75°
47°
19
76°
52°
20
78°
57°
21
79°
56°
22
76°
56°
23
75°
55°
24
72°
56°
25
75°
56°
26
78°
53°
27
82°
42°
28
70°
45°
29
72°
50°
30
72°
52°
1
77°
55°
2
79°
56°
3
82°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fairbury
Fairbury's September 2026 forecast shows daily high temperatures ranging from 70° to 90°, with overnight lows between 42° and 67°. The average high for September is 81° 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 Fairbury. See also: October | November | December.
