S
M
T
W
T
F
S
30
88°
66°
31
91°
64°
1
90°
61°
2
86°
64°
3
88°
70°
4
91°
70°
5
82°
66°
6
79°
68°
7
82°
64°
8
82°
64°
9
84°
55°
10
79°
52°
11
84°
63°
12
75°
50°
13
72°
45°
14
61°
43°
15
72°
48°
16
73°
45°
17
72°
57°
18
61°
57°
19
63°
51°
20
68°
48°
21
63°
43°
22
65°
39°
23
64°
44°
24
71°
46°
25
70°
51°
26
71°
49°
27
68°
52°
28
70°
53°
29
70°
49°
30
68°
50°
1
65°
42°
2
59°
44°
3
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Plum City
Plum City's September 2026 forecast shows daily high temperatures ranging from 59° to 71°, with overnight lows between 39° and 57°. The average high for September is 66° with an average low of 48°. 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 Plum City. See also: October | November | December.
