S
M
T
W
T
F
S
30
79°
62°
31
76°
63°
1
79°
63°
2
82°
57°
3
81°
53°
4
73°
55°
5
73°
62°
6
80°
56°
7
77°
53°
8
72°
54°
9
71°
57°
10
72°
60°
11
73°
59°
12
79°
60°
13
79°
58°
14
78°
52°
15
75°
51°
16
68°
53°
17
69°
49°
18
69°
49°
19
70°
46°
20
67°
45°
21
65°
48°
22
66°
54°
23
70°
47°
24
69°
53°
25
72°
54°
26
68°
54°
27
74°
55°
28
74°
50°
29
73°
48°
30
63°
49°
1
66°
50°
2
71°
51°
3
64°
42°
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 63° to 82°, with overnight lows between 42° and 63°. 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.
