S
M
T
W
T
F
S
31
74°
42°
1
76°
45°
2
76°
45°
3
69°
49°
4
64°
40°
5
63°
43°
6
65°
42°
7
66°
39°
8
72°
37°
9
75°
42°
10
74°
46°
11
76°
52°
12
83°
56°
13
79°
58°
14
82°
57°
15
81°
53°
16
82°
50°
17
83°
51°
18
84°
52°
19
83°
61°
20
79°
57°
21
79°
60°
22
78°
55°
23
70°
57°
24
70°
54°
25
74°
51°
26
85°
50°
27
85°
54°
28
78°
52°
29
86°
49°
30
81°
52°
1
75°
52°
2
83°
50°
3
89°
53°
4
87°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in McHenry
McHenry's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 McHenry. See also: October | November | December.
