S
M
T
W
T
F
S
30
78°
68°
31
86°
68°
1
86°
71°
2
80°
68°
3
77°
67°
4
76°
68°
5
77°
64°
6
78°
62°
7
75°
63°
8
75°
68°
9
78°
61°
10
71°
56°
11
70°
57°
12
69°
56°
13
66°
55°
14
66°
54°
15
69°
51°
16
73°
57°
17
71°
56°
18
69°
56°
19
71°
57°
20
72°
57°
21
71°
56°
22
71°
55°
23
68°
55°
24
70°
54°
25
68°
54°
26
66°
53°
27
61°
50°
28
59°
49°
29
58°
48°
30
57°
45°
1
58°
51°
2
59°
51°
3
61°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Door County Park
Door County Park's September 2026 forecast shows daily high temperatures ranging from 57° to 80°, with overnight lows between 45° and 68°. The average high for September is 69° with an average low of 56°. 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 Door County Park. See also: October | November | December.