S
M
T
W
T
F
S
30
70°
61°
31
75°
57°
1
71°
60°
2
68°
65°
3
68°
65°
4
67°
56°
5
68°
58°
6
72°
58°
7
72°
58°
8
66°
56°
9
64°
50°
10
64°
52°
11
68°
55°
12
69°
53°
13
70°
54°
14
66°
50°
15
67°
52°
16
66°
50°
17
66°
52°
18
65°
54°
19
68°
54°
20
64°
52°
21
66°
54°
22
67°
55°
23
67°
53°
24
66°
50°
25
65°
48°
26
65°
48°
27
66°
53°
28
66°
53°
29
65°
54°
30
66°
54°
1
67°
53°
2
67°
53°
3
66°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Newhaven
Newhaven's September 2026 forecast shows daily high temperatures ranging from 64° to 72°, with overnight lows between 48° and 65°. The average high for September is 67° with an average low of 54°. 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 Newhaven. See also: October | November | December.
