S
M
T
W
T
F
S
30
76°
49°
31
72°
46°
1
67°
46°
2
67°
47°
3
66°
45°
4
66°
46°
5
67°
45°
6
67°
45°
7
70°
49°
8
73°
52°
9
67°
49°
10
65°
50°
11
66°
51°
12
69°
47°
13
70°
50°
14
71°
49°
15
67°
44°
16
63°
44°
17
62°
43°
18
66°
50°
19
70°
50°
20
Hist. Avg.
65°
47°
21
Hist. Avg.
64°
46°
22
Hist. Avg.
64°
46°
23
Hist. Avg.
64°
46°
24
Hist. Avg.
63°
45°
25
Hist. Avg.
63°
45°
26
Hist. Avg.
62°
45°
27
Hist. Avg.
62°
44°
28
Hist. Avg.
62°
44°
29
Hist. Avg.
61°
44°
30
Hist. Avg.
61°
43°
1
Hist. Avg.
60°
43°
2
Hist. Avg.
60°
42°
3
Hist. Avg.
60°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Brownsburg-Chatham
Brownsburg-Chatham's September 2026 forecast shows daily high temperatures ranging from 62° to 76°, with overnight lows between 43° and 52°. The average high for September is 68° with an average low of 47°. 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 Brownsburg-Chatham. See also: October | November | December.
