S
M
T
W
T
F
S
30
71°
55°
31
72°
54°
1
72°
53°
2
69°
53°
3
72°
54°
4
71°
52°
5
72°
54°
6
71°
55°
7
69°
53°
8
71°
55°
9
72°
50°
10
68°
50°
11
72°
51°
12
73°
55°
13
71°
54°
14
67°
53°
15
73°
57°
16
75°
57°
17
74°
56°
18
75°
47°
19
72°
46°
20
68°
46°
21
63°
51°
22
65°
53°
23
70°
53°
24
64°
52°
25
65°
44°
26
67°
42°
27
62°
43°
28
61°
44°
29
60°
43°
30
59°
46°
1
61°
48°
2
Hist. Avg.
64°
44°
3
Hist. Avg.
63°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fond du Lac
Fond du Lac's September 2026 forecast shows daily high temperatures ranging from 59° to 75°, with overnight lows between 42° and 57°. The average high for September is 69° with an average low of 51°. 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 Fond du Lac. See also: October | November | December.
