S
M
T
W
T
F
S
31
82°
62°
1
86°
59°
2
87°
61°
3
88°
63°
4
75°
60°
5
79°
60°
6
75°
53°
7
73°
49°
8
77°
52°
9
83°
50°
10
85°
61°
11
88°
65°
12
88°
61°
13
93°
60°
14
94°
68°
15
93°
68°
16
92°
63°
17
90°
59°
18
92°
61°
19
93°
59°
20
93°
63°
21
87°
66°
22
81°
66°
23
85°
66°
24
75°
67°
25
79°
59°
26
82°
55°
27
83°
57°
28
88°
58°
29
89°
59°
30
88°
60°
1
86°
61°
2
86°
61°
3
75°
62°
4
85°
59°
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.
