S
M
T
W
T
F
S
30
80°
63°
31
79°
67°
1
80°
66°
2
74°
66°
3
80°
64°
4
79°
60°
5
76°
58°
6
77°
57°
7
78°
59°
8
79°
60°
9
80°
63°
10
79°
58°
11
80°
53°
12
72°
52°
13
72°
53°
14
77°
53°
15
70°
52°
16
69°
57°
17
73°
51°
18
68°
48°
19
68°
48°
20
69°
52°
21
72°
56°
22
76°
56°
23
76°
55°
24
74°
54°
25
74°
53°
26
73°
53°
27
74°
54°
28
74°
53°
29
73°
51°
30
66°
46°
1
63°
46°
2
65°
51°
3
71°
52°
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 63° to 80°, with overnight lows between 46° and 67°. The average high for September is 74° with an average low of 55°. 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.
