S
M
T
W
T
F
S
30
75°
62°
31
74°
63°
1
79°
58°
2
74°
58°
3
75°
57°
4
74°
56°
5
73°
56°
6
76°
60°
7
77°
59°
8
75°
61°
9
78°
61°
10
72°
60°
11
74°
60°
12
77°
59°
13
77°
60°
14
76°
60°
15
77°
59°
16
76°
53°
17
74°
57°
18
68°
60°
19
74°
59°
20
75°
59°
21
74°
57°
22
73°
50°
23
71°
55°
24
67°
56°
25
66°
57°
26
Hist. Avg.
70°
50°
27
Hist. Avg.
69°
50°
28
Hist. Avg.
69°
50°
29
Hist. Avg.
68°
49°
30
Hist. Avg.
68°
49°
1
Hist. Avg.
68°
48°
2
Hist. Avg.
67°
48°
3
Hist. Avg.
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Haddam
Haddam's September 2026 forecast shows daily high temperatures ranging from 66° to 79°, with overnight lows between 50° and 63°. The average high for September is 74° with an average low of 58°. 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 Haddam. See also: October | November | December.
