S
M
T
W
T
F
S
30
81°
68°
31
87°
70°
1
93°
73°
2
94°
73°
3
90°
72°
4
95°
70°
5
84°
69°
6
83°
63°
7
82°
64°
8
89°
65°
9
89°
61°
10
83°
60°
11
79°
55°
12
80°
57°
13
83°
57°
14
82°
58°
15
84°
56°
16
78°
51°
17
81°
57°
18
73°
56°
19
78°
56°
20
79°
55°
21
78°
56°
22
77°
54°
23
73°
53°
24
75°
51°
25
78°
53°
26
78°
48°
27
68°
44°
28
66°
41°
29
67°
44°
30
66°
42°
1
65°
43°
2
68°
50°
3
67°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Streamwood
Streamwood's September 2026 forecast shows daily high temperatures ranging from 65° to 95°, with overnight lows between 41° and 72°. The average high for September is 78° 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 Streamwood. See also: October | November | December.
