S
M
T
W
T
F
S
30
78°
63°
31
85°
62°
1
85°
62°
2
84°
61°
3
84°
61°
4
81°
62°
5
82°
61°
6
84°
56°
7
82°
54°
8
74°
52°
9
75°
59°
10
74°
60°
11
81°
59°
12
79°
60°
13
82°
54°
14
81°
50°
15
73°
52°
16
70°
54°
17
71°
48°
18
71°
49°
19
73°
46°
20
70°
47°
21
70°
51°
22
71°
55°
23
77°
55°
24
77°
56°
25
76°
56°
26
77°
54°
27
78°
55°
28
76°
51°
29
73°
50°
30
71°
51°
1
72°
49°
2
75°
52°
3
67°
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 67° to 85°, with overnight lows between 42° and 63°. The average high for September is 77° with an average low of 55°. 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.
