S
M
T
W
T
F
S
30
86°
67°
31
90°
67°
1
94°
71°
2
96°
72°
3
96°
72°
4
97°
74°
5
93°
70°
6
82°
70°
7
83°
65°
8
85°
59°
9
87°
63°
10
90°
68°
11
86°
68°
12
81°
67°
13
85°
66°
14
86°
67°
15
87°
68°
16
84°
65°
17
81°
62°
18
77°
61°
19
79°
59°
20
74°
59°
21
77°
58°
22
82°
62°
23
80°
61°
24
78°
61°
25
80°
60°
26
82°
62°
27
82°
61°
28
81°
61°
29
81°
60°
30
80°
60°
1
79°
59°
2
78°
59°
3
79°
57°
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 74° to 90°, with overnight lows between 57° and 68°. The average high for September is 82° with an average low of 62°. 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.
