S
M
T
W
T
F
S
30
73°
62°
31
75°
59°
1
73°
54°
2
70°
60°
3
79°
66°
4
72°
57°
5
73°
55°
6
79°
57°
7
78°
58°
8
66°
49°
9
69°
49°
10
70°
56°
11
71°
51°
12
72°
57°
13
70°
56°
14
74°
58°
15
72°
53°
16
68°
52°
17
69°
52°
18
69°
53°
19
70°
54°
20
69°
53°
21
69°
53°
22
70°
52°
23
69°
52°
24
69°
51°
25
68°
50°
26
66°
50°
27
65°
49°
28
65°
50°
29
64°
49°
30
66°
50°
1
65°
44°
2
66°
50°
3
66°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Danbury
Danbury's September 2026 forecast shows daily high temperatures ranging from 64° to 78°, with overnight lows between 44° and 58°. The average high for September is 69° with an average low of 52°. 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 Danbury. See also: October | November | December.
