S
M
T
W
T
F
S
30
73°
54°
31
76°
60°
1
73°
61°
2
79°
54°
3
73°
51°
4
70°
52°
5
69°
51°
6
69°
55°
7
75°
58°
8
78°
60°
9
78°
59°
10
77°
53°
11
71°
57°
12
70°
55°
13
73°
50°
14
69°
51°
15
67°
50°
16
68°
49°
17
70°
56°
18
74°
47°
19
67°
51°
20
68°
47°
21
68°
51°
22
67°
55°
23
74°
56°
24
75°
55°
25
73°
55°
26
72°
56°
27
73°
55°
28
75°
51°
29
72°
53°
30
71°
55°
1
73°
51°
2
73°
44°
3
70°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mequon
Mequon's September 2026 forecast shows daily high temperatures ranging from 67° to 79°, with overnight lows between 42° and 61°. The average high for September is 72° with an average low of 53°. 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.
