S
M
T
W
T
F
S
30
90°
65°
31
94°
64°
1
96°
68°
2
97°
69°
3
96°
70°
4
96°
70°
5
95°
69°
6
84°
60°
7
83°
56°
8
90°
71°
9
87°
68°
10
82°
56°
11
84°
63°
12
83°
65°
13
80°
65°
14
82°
63°
15
78°
56°
16
76°
55°
17
73°
53°
18
72°
54°
19
71°
52°
20
75°
55°
21
77°
52°
22
76°
57°
23
77°
56°
24
80°
57°
25
81°
58°
26
81°
58°
27
80°
57°
28
80°
58°
29
79°
58°
30
78°
57°
1
76°
51°
2
66°
46°
3
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Delavan
Delavan's September 2026 forecast shows daily high temperatures ranging from 65° to 90°, with overnight lows between 42° and 71°. The average high for September is 78° with an average low of 57°. 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. See also: October | November | December.
