S
M
T
W
T
F
S
30
73°
47°
31
74°
47°
1
72°
46°
2
72°
49°
3
73°
49°
4
70°
51°
5
72°
47°
6
71°
48°
7
69°
46°
8
70°
45°
9
69°
46°
10
70°
52°
11
69°
45°
12
69°
45°
13
73°
43°
14
71°
50°
15
72°
50°
16
69°
44°
17
67°
42°
18
69°
42°
19
70°
48°
20
72°
49°
21
72°
48°
22
67°
46°
23
71°
46°
24
69°
43°
25
67°
46°
26
63°
39°
27
69°
40°
28
61°
39°
29
60°
39°
30
60°
38°
1
Hist. Avg.
66°
43°
2
Hist. Avg.
66°
43°
3
Hist. Avg.
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sunapee
Sunapee's September 2026 forecast shows daily high temperatures ranging from 60° to 74°, with overnight lows between 38° and 52°. The average high for September is 69° with an average low of 45°. 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 Sunapee. See also: October | November | December.
