S
M
T
W
T
F
S
26
82°
68°
27
82°
71°
28
83°
69°
29
83°
68°
30
85°
71°
31
83°
66°
1
82°
70°
2
84°
71°
3
85°
65°
4
86°
64°
5
81°
65°
6
81°
64°
7
83°
64°
8
81°
65°
9
83°
69°
10
85°
69°
11
83°
68°
12
85°
68°
13
85°
70°
14
84°
70°
15
82°
69°
16
86°
63°
17
85°
62°
18
79°
62°
19
79°
63°
20
78°
64°
21
79°
61°
22
78°
67°
23
79°
68°
24
82°
69°
25
85°
68°
26
85°
60°
27
83°
60°
28
76°
61°
29
76°
61°
30
77°
64°
31
77°
67°
1
82°
67°
2
82°
65°
3
81°
61°
4
81°
66°
5
80°
60°
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 76° to 86°, with overnight lows between 60° and 71°. The average high for August is 82° with an average low of 66°. 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.
