S
M
T
W
T
F
S
30
75°
66°
31
87°
69°
1
92°
62°
2
85°
65°
3
75°
66°
4
81°
63°
5
80°
57°
6
79°
59°
7
75°
59°
8
76°
64°
9
82°
55°
10
74°
53°
11
72°
50°
12
70°
53°
13
76°
52°
14
76°
52°
15
77°
53°
16
70°
47°
17
74°
53°
18
71°
51°
19
73°
53°
20
73°
52°
21
72°
51°
22
72°
50°
23
69°
50°
24
71°
51°
25
68°
49°
26
65°
45°
27
60°
42°
28
58°
38°
29
59°
39°
30
58°
36°
1
57°
46°
2
57°
46°
3
60°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Birnamwood
Birnamwood's September 2026 forecast shows daily high temperatures ranging from 57° to 82°, with overnight lows between 36° and 66°. The average high for September is 70° 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 Birnamwood. See also: October | November | December.
