S
M
T
W
T
F
S
30
74°
57°
31
74°
56°
1
75°
55°
2
73°
54°
3
74°
55°
4
74°
55°
5
75°
57°
6
74°
58°
7
72°
56°
8
73°
55°
9
72°
52°
10
72°
51°
11
73°
51°
12
73°
53°
13
74°
53°
14
70°
55°
15
76°
59°
16
77°
59°
17
76°
58°
18
76°
49°
19
75°
48°
20
69°
48°
21
67°
54°
22
68°
56°
23
74°
56°
24
72°
55°
25
73°
46°
26
72°
44°
27
64°
44°
28
62°
45°
29
63°
45°
30
64°
50°
1
63°
51°
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
September Weather in Brown Deer Park
Brown Deer Park's September 2026 forecast shows daily high temperatures ranging from 62° to 77°, with overnight lows between 44° and 59°. The average high for September is 72° with an average low of 53°. 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 Park. See also: October | November | December.
