S
M
T
W
T
F
S
30
82°
67°
31
83°
66°
1
82°
58°
2
81°
57°
3
Hist. Avg.
78°
61°
4
Hist. Avg.
78°
61°
5
Hist. Avg.
78°
61°
6
Hist. Avg.
78°
60°
7
Hist. Avg.
77°
60°
8
Hist. Avg.
77°
60°
9
Hist. Avg.
77°
60°
10
Hist. Avg.
77°
59°
11
Hist. Avg.
76°
59°
12
Hist. Avg.
76°
59°
13
Hist. Avg.
76°
58°
14
Hist. Avg.
75°
58°
15
Hist. Avg.
75°
58°
16
Hist. Avg.
75°
57°
17
Hist. Avg.
74°
57°
18
Hist. Avg.
74°
57°
19
Hist. Avg.
74°
56°
20
Hist. Avg.
73°
56°
21
Hist. Avg.
73°
56°
22
Hist. Avg.
73°
55°
23
Hist. Avg.
72°
55°
24
Hist. Avg.
72°
54°
25
Hist. Avg.
72°
54°
26
Hist. Avg.
71°
54°
27
Hist. Avg.
71°
53°
28
Hist. Avg.
70°
53°
29
Hist. Avg.
70°
52°
30
Hist. Avg.
70°
52°
1
Hist. Avg.
69°
52°
2
Hist. Avg.
69°
51°
3
Hist. Avg.
69°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in New Haven
New Haven's September 2026 forecast shows daily high temperatures ranging from 81° to 83°, with overnight lows between 57° and 67°. 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 New Haven. See also: October | November | December.
