S
M
T
W
T
F
S
30
81°
61°
31
81°
60°
1
80°
59°
2
80°
60°
3
81°
61°
4
82°
60°
5
81°
60°
6
80°
59°
7
81°
58°
8
77°
56°
9
77°
56°
10
78°
57°
11
79°
57°
12
75°
54°
13
66°
47°
14
64°
47°
15
65°
52°
16
64°
52°
17
65°
46°
18
72°
50°
19
74°
53°
20
74°
53°
21
73°
52°
22
69°
41°
23
72°
43°
24
70°
50°
25
69°
51°
26
67°
41°
27
71°
37°
28
61°
38°
29
65°
46°
30
64°
45°
1
59°
43°
2
58°
49°
3
63°
49°
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 58° to 82°, with overnight lows between 37° and 61°. The average high for September is 72° 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.
