S
M
T
W
T
F
S
30
76°
55°
31
72°
61°
1
74°
53°
2
71°
57°
3
71°
58°
4
71°
58°
5
67°
55°
6
69°
52°
7
70°
53°
8
70°
52°
9
72°
51°
10
75°
54°
11
73°
54°
12
73°
52°
13
72°
55°
14
71°
51°
15
65°
54°
16
68°
55°
17
69°
54°
18
67°
53°
19
63°
53°
20
64°
51°
21
68°
54°
22
69°
54°
23
69°
53°
24
68°
52°
25
66°
51°
26
68°
52°
27
67°
51°
28
67°
51°
29
66°
49°
30
59°
47°
1
58°
46°
2
58°
48°
3
59°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dartmouth
Dartmouth's September 2026 forecast shows daily high temperatures ranging from 58° to 75°, with overnight lows between 46° and 58°. The average high for September is 68° with an average low of 52°. 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 Dartmouth. See also: October | November | December.
