S
M
T
W
T
F
S
30
83°
66°
31
83°
60°
1
80°
58°
2
75°
60°
3
75°
59°
4
76°
59°
5
75°
60°
6
75°
58°
7
74°
58°
8
75°
59°
9
75°
62°
10
74°
58°
11
76°
59°
12
76°
59°
13
79°
60°
14
77°
59°
15
74°
57°
16
73°
57°
17
71°
56°
18
72°
58°
19
72°
56°
20
71°
62°
21
Hist. Avg.
74°
57°
22
Hist. Avg.
73°
57°
23
Hist. Avg.
73°
57°
24
Hist. Avg.
73°
56°
25
Hist. Avg.
72°
56°
26
Hist. Avg.
72°
56°
27
Hist. Avg.
72°
55°
28
Hist. Avg.
71°
55°
29
Hist. Avg.
71°
55°
30
Hist. Avg.
70°
54°
1
Hist. Avg.
70°
54°
2
Hist. Avg.
70°
54°
3
Hist. Avg.
69°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Dartmouth
Dartmouth's September 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 56° and 66°. The average high for September is 76° with an average low of 59°. 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.
