S
M
T
W
T
F
S
26
77°
50°
27
75°
50°
28
79°
59°
29
78°
58°
30
67°
60°
31
78°
64°
1
74°
61°
2
80°
61°
3
75°
64°
4
82°
63°
5
89°
62°
6
90°
64°
7
91°
65°
8
84°
67°
9
79°
66°
10
82°
65°
11
80°
63°
12
81°
64°
13
78°
61°
14
77°
58°
15
79°
57°
16
77°
57°
17
74°
57°
18
77°
56°
19
79°
56°
20
78°
57°
21
75°
56°
22
74°
57°
23
75°
56°
24
77°
57°
25
72°
56°
26
73°
58°
27
75°
60°
28
72°
58°
29
70°
58°
30
73°
57°
31
70°
57°
1
71°
56°
2
70°
58°
3
73°
58°
4
74°
57°
5
68°
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 68° to 79°, with overnight lows between 56° and 61°. The average high for August is 74° with an average low of 57°. 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.
