S
M
T
W
T
F
S
30
79°
64°
31
82°
63°
1
81°
56°
2
78°
55°
3
80°
59°
4
76°
61°
5
76°
60°
6
77°
58°
7
76°
54°
8
77°
51°
9
73°
52°
10
72°
61°
11
77°
57°
12
78°
59°
13
78°
59°
14
76°
58°
15
77°
59°
16
70°
50°
17
69°
54°
18
Hist. Avg.
73°
52°
19
Hist. Avg.
73°
52°
20
Hist. Avg.
72°
51°
21
Hist. Avg.
72°
51°
22
Hist. Avg.
71°
50°
23
Hist. Avg.
71°
50°
24
Hist. Avg.
70°
49°
25
Hist. Avg.
70°
49°
26
Hist. Avg.
70°
48°
27
Hist. Avg.
69°
48°
28
Hist. Avg.
68°
48°
29
Hist. Avg.
68°
47°
30
Hist. Avg.
68°
47°
1
Hist. Avg.
67°
46°
2
Hist. Avg.
67°
46°
3
Hist. Avg.
66°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Brown Deer
Brown Deer's September 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 50° and 64°. The average high for September is 76° 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 Brown Deer. See also: October | November | December.
