S
M
T
W
T
F
S
30
82°
61°
31
82°
61°
1
81°
60°
2
79°
60°
3
81°
59°
4
81°
60°
5
80°
60°
6
82°
59°
7
83°
61°
8
83°
60°
9
78°
59°
10
79°
58°
11
80°
59°
12
81°
59°
13
80°
56°
14
69°
46°
15
69°
53°
16
72°
53°
17
71°
51°
18
69°
49°
19
74°
50°
20
77°
54°
21
77°
54°
22
76°
51°
23
75°
44°
24
70°
44°
25
71°
52°
26
72°
52°
27
71°
42°
28
71°
41°
29
65°
46°
30
67°
50°
1
67°
49°
2
70°
52°
3
73°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Delavan Lake
Delavan Lake's September 2026 forecast shows daily high temperatures ranging from 65° to 83°, with overnight lows between 41° and 61°. The average high for September is 75° with an average low of 54°. 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 Delavan Lake. See also: October | November | December.
