S
M
T
W
T
F
S
30
83°
61°
31
84°
62°
1
84°
62°
2
83°
59°
3
78°
59°
4
83°
61°
5
80°
60°
6
77°
59°
7
77°
59°
8
78°
56°
9
77°
52°
10
75°
53°
11
77°
60°
12
83°
59°
13
80°
60°
14
75°
58°
15
80°
59°
16
72°
54°
17
78°
51°
18
73°
53°
19
Hist. Avg.
74°
51°
20
Hist. Avg.
74°
50°
21
Hist. Avg.
73°
50°
22
Hist. Avg.
73°
50°
23
Hist. Avg.
72°
49°
24
Hist. Avg.
72°
49°
25
Hist. Avg.
72°
49°
26
Hist. Avg.
71°
48°
27
Hist. Avg.
71°
48°
28
Hist. Avg.
70°
47°
29
Hist. Avg.
70°
47°
30
Hist. Avg.
70°
47°
1
Hist. Avg.
69°
46°
2
Hist. Avg.
69°
46°
3
Hist. Avg.
68°
45°
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 72° to 84°, with overnight lows between 51° and 62°. The average high for September is 79° 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 New Haven. See also: October | November | December.
