S
M
T
W
T
F
S
30
81°
57°
31
80°
59°
1
81°
59°
2
85°
58°
3
87°
52°
4
83°
50°
5
78°
49°
6
76°
53°
7
78°
57°
8
79°
53°
9
80°
53°
10
83°
54°
11
83°
52°
12
78°
48°
13
76°
47°
14
77°
48°
15
78°
50°
16
83°
53°
17
82°
52°
18
83°
52°
19
82°
43°
20
72°
41°
21
Hist. Avg.
80°
49°
22
Hist. Avg.
79°
49°
23
Hist. Avg.
79°
48°
24
Hist. Avg.
78°
48°
25
Hist. Avg.
78°
47°
26
Hist. Avg.
77°
47°
27
Hist. Avg.
77°
46°
28
Hist. Avg.
76°
46°
29
Hist. Avg.
76°
46°
30
Hist. Avg.
75°
45°
1
Hist. Avg.
75°
45°
2
Hist. Avg.
74°
44°
3
Hist. Avg.
74°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Danbury
Danbury's September 2026 forecast shows daily high temperatures ranging from 72° to 87°, with overnight lows between 41° and 59°. The average high for September is 80° 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.
