S
M
T
W
T
F
S
30
79°
60°
31
79°
64°
1
83°
63°
2
79°
56°
3
78°
54°
4
75°
55°
5
76°
55°
6
78°
56°
7
80°
58°
8
82°
62°
9
82°
60°
10
81°
54°
11
76°
59°
12
78°
60°
13
78°
53°
14
75°
52°
15
73°
51°
16
75°
52°
17
74°
56°
18
77°
54°
19
78°
58°
20
79°
58°
21
80°
57°
22
79°
58°
23
78°
58°
24
75°
57°
25
76°
57°
26
78°
56°
27
79°
56°
28
79°
55°
29
78°
56°
30
79°
56°
1
78°
55°
2
78°
47°
3
77°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Peoria
Peoria's September 2026 forecast shows daily high temperatures ranging from 73° to 83°, with overnight lows between 46° and 64°. The average high for September is 78° 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 Peoria. See also: October | November | December.
