S
M
T
W
T
F
S
31
75°
49°
1
76°
50°
2
77°
50°
3
68°
40°
4
62°
44°
5
61°
46°
6
64°
46°
7
67°
40°
8
72°
42°
9
75°
51°
10
76°
55°
11
76°
58°
12
83°
58°
13
81°
62°
14
82°
60°
15
82°
57°
16
89°
62°
17
83°
56°
18
83°
65°
19
83°
63°
20
83°
62°
21
83°
61°
22
83°
56°
23
83°
55°
24
83°
55°
25
83°
50°
26
83°
50°
27
83°
50°
28
83°
47°
29
86°
47°
30
86°
47°
1
76°
57°
2
86°
47°
3
86°
63°
4
86°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Atkinson
Fort Atkinson'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 Fort Atkinson. See also: October | November | December.
