S
M
T
W
T
F
S
30
78°
59°
31
81°
58°
1
83°
61°
2
82°
63°
3
85°
64°
4
83°
55°
5
83°
60°
6
82°
62°
7
79°
61°
8
84°
62°
9
86°
62°
10
86°
61°
11
85°
62°
12
85°
62°
13
84°
61°
14
83°
61°
15
83°
60°
16
80°
61°
17
79°
58°
18
80°
53°
19
77°
51°
20
74°
50°
21
73°
52°
22
75°
48°
23
71°
50°
24
71°
57°
25
70°
57°
26
76°
56°
27
71°
57°
28
72°
58°
29
76°
57°
30
74°
46°
1
73°
44°
2
67°
43°
3
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Streator
Streator's September 2026 forecast shows daily high temperatures ranging from 65° to 86°, with overnight lows between 42° and 64°. The average high for September is 78° with an average low of 56°. 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 Streator. See also: October | November | December.
