S
M
T
W
T
F
S
30
78°
58°
31
81°
59°
1
83°
60°
2
82°
61°
3
83°
62°
4
82°
60°
5
81°
54°
6
79°
56°
7
80°
56°
8
82°
59°
9
83°
59°
10
83°
58°
11
82°
59°
12
83°
59°
13
83°
58°
14
82°
60°
15
80°
59°
16
80°
59°
17
77°
57°
18
75°
52°
19
74°
48°
20
71°
54°
21
71°
52°
22
73°
46°
23
70°
46°
24
70°
54°
25
71°
55°
26
69°
54°
27
70°
55°
28
73°
54°
29
68°
54°
30
67°
49°
1
67°
43°
2
66°
42°
3
64°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Hampshire
New Hampshire's September 2026 forecast shows daily high temperatures ranging from 64° to 83°, with overnight lows between 42° and 62°. The average high for September is 76° with an average low of 55°. 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 Hampshire. See also: October | November | December.
