S
M
T
W
T
F
S
30
99°
77°
31
100°
76°
1
100°
75°
2
99°
75°
3
99°
76°
4
100°
73°
5
98°
72°
6
99°
74°
7
98°
72°
8
97°
74°
9
96°
73°
10
96°
72°
11
97°
71°
12
97°
71°
13
99°
72°
14
101°
69°
15
97°
69°
16
95°
70°
17
95°
70°
18
98°
69°
19
97°
71°
20
100°
73°
21
100°
74°
22
102°
76°
23
102°
75°
24
97°
73°
25
92°
70°
26
94°
70°
27
92°
69°
28
94°
70°
29
95°
69°
30
91°
70°
1
90°
67°
2
90°
65°
3
95°
69°
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 90° to 102°, with overnight lows between 65° and 77°. The average high for September is 97° with an average low of 72°. 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.
