S
M
T
W
T
F
S
30
80°
64°
31
88°
58°
1
86°
52°
2
85°
61°
3
88°
62°
4
80°
64°
5
82°
63°
6
83°
60°
7
81°
61°
8
78°
64°
9
77°
53°
10
78°
46°
11
86°
62°
12
71°
46°
13
67°
40°
14
61°
35°
15
69°
44°
16
73°
38°
17
70°
51°
18
60°
48°
19
62°
51°
20
64°
41°
21
62°
38°
22
66°
39°
23
67°
45°
24
66°
49°
25
68°
52°
26
69°
54°
27
68°
50°
28
68°
49°
29
67°
47°
30
67°
48°
1
69°
49°
2
63°
41°
3
61°
47°
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 61° to 69°, with overnight lows between 38° and 54°. The average high for September is 66° with an average low of 46°. 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.
