S
M
T
W
T
F
S
30
79°
57°
31
75°
59°
1
76°
54°
2
76°
52°
3
76°
58°
4
81°
61°
5
79°
61°
6
81°
58°
7
82°
59°
8
75°
60°
9
75°
54°
10
78°
52°
11
74°
54°
12
77°
55°
13
77°
54°
14
76°
59°
15
79°
59°
16
81°
58°
17
79°
53°
18
79°
47°
19
71°
47°
20
69°
48°
21
70°
50°
22
77°
57°
23
78°
57°
24
77°
54°
25
78°
45°
26
75°
46°
27
67°
44°
28
65°
44°
29
66°
45°
30
68°
53°
1
65°
48°
2
65°
42°
3
Hist. Avg.
69°
42°
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 65° to 82°, with overnight lows between 42° and 61°. The average high for September is 75° with an average low of 53°. 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.
