S
M
T
W
T
F
S
30
84°
68°
31
86°
70°
1
88°
71°
2
88°
69°
3
75°
69°
4
82°
68°
5
75°
63°
6
73°
57°
7
75°
57°
8
77°
68°
9
81°
56°
10
75°
53°
11
77°
61°
12
81°
54°
13
64°
44°
14
68°
63°
15
73°
57°
16
66°
59°
17
64°
59°
18
64°
59°
19
64°
60°
20
63°
55°
21
61°
52°
22
59°
52°
23
63°
52°
24
64°
54°
25
64°
45°
26
63°
42°
27
68°
44°
28
70°
47°
29
72°
60°
30
N/A
1
66°
46°
2
64°
38°
3
63°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mequon
Mequon's September 2026 forecast shows daily high temperatures ranging from 63° to 66°, with overnight lows between 38° and 50°. The average high for September is 64° with an average low of 45°. 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 Mequon. See also: October | November | December.
