S
M
T
W
T
F
S
26
77°
50°
27
75°
50°
28
79°
59°
29
78°
58°
30
67°
60°
31
71°
62°
1
75°
59°
2
78°
62°
3
74°
63°
4
82°
61°
5
86°
59°
6
79°
59°
7
78°
60°
8
82°
59°
9
79°
61°
10
78°
59°
11
79°
60°
12
77°
56°
13
75°
58°
14
76°
57°
15
75°
61°
16
74°
60°
17
73°
60°
18
72°
59°
19
70°
58°
20
71°
59°
21
72°
58°
22
71°
59°
23
72°
60°
24
75°
60°
25
72°
58°
26
70°
58°
27
70°
57°
28
71°
58°
29
71°
60°
30
72°
59°
31
75°
58°
1
74°
57°
2
69°
57°
3
69°
56°
4
70°
57°
5
71°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Dartmouth
Dartmouth's August 2026 forecast shows daily high temperatures ranging from 69° to 86°, with overnight lows between 56° and 63°. The average high for August is 74° 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 August weather will actually feel in Dartmouth. See also: September | October | November.
