S
M
T
W
T
F
S
30
105°
79°
31
92°
80°
1
101°
80°
2
103°
87°
3
103°
85°
4
104°
84°
5
101°
83°
6
106°
83°
7
108°
82°
8
110°
86°
9
108°
87°
10
109°
87°
11
106°
86°
12
100°
82°
13
100°
79°
14
101°
78°
15
100°
79°
16
100°
77°
17
102°
79°
18
103°
79°
19
101°
78°
20
100°
77°
21
97°
70°
22
92°
70°
23
94°
72°
24
94°
71°
25
96°
72°
26
98°
74°
27
94°
72°
28
89°
66°
29
91°
68°
30
89°
62°
1
87°
62°
2
90°
65°
3
91°
67°
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 87° to 110°, with overnight lows between 62° and 87°. The average high for September is 98° with an average low of 75°. 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.
