S
M
T
W
T
F
S
30
93°
74°
31
92°
75°
1
91°
75°
2
95°
77°
3
91°
78°
4
91°
75°
5
90°
75°
6
89°
75°
7
89°
77°
8
88°
75°
9
89°
76°
10
90°
75°
11
92°
74°
12
90°
74°
13
91°
73°
14
90°
74°
15
88°
73°
16
87°
70°
17
87°
74°
18
86°
73°
19
88°
72°
20
89°
73°
21
88°
73°
22
89°
72°
23
87°
72°
24
86°
71°
25
84°
72°
26
83°
71°
27
82°
68°
28
81°
64°
29
81°
64°
30
82°
63°
1
81°
64°
2
84°
68°
3
81°
62°
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 81° to 92°, with overnight lows between 62° and 78°. The average high for September is 87° with an average low of 72°. 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.
