S
M
T
W
T
F
S
30
77°
62°
31
77°
60°
1
78°
62°
2
78°
66°
3
81°
66°
4
85°
65°
5
84°
66°
6
82°
65°
7
80°
64°
8
77°
63°
9
76°
64°
10
76°
64°
11
77°
63°
12
79°
63°
13
82°
62°
14
80°
62°
15
80°
61°
16
81°
62°
17
79°
62°
18
78°
61°
19
77°
61°
20
78°
62°
21
82°
59°
22
82°
57°
23
81°
47°
24
75°
48°
25
74°
53°
26
77°
50°
27
73°
59°
28
79°
59°
29
82°
58°
30
77°
52°
1
80°
50°
2
68°
55°
3
67°
53°
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 47° and 66°. The average high for September is 78° with an average low of 60°. 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.
