S
M
T
W
T
F
S
26
77°
64°
27
78°
64°
28
76°
61°
29
76°
55°
30
80°
62°
31
76°
68°
1
72°
63°
2
74°
59°
3
75°
60°
4
75°
62°
5
75°
59°
6
74°
59°
7
79°
62°
8
75°
61°
9
74°
59°
10
71°
57°
11
71°
58°
12
70°
59°
13
74°
57°
14
73°
58°
15
69°
56°
16
71°
61°
17
73°
61°
18
74°
60°
19
76°
61°
20
73°
60°
21
72°
61°
22
77°
62°
23
76°
61°
24
74°
60°
25
74°
61°
26
76°
61°
27
75°
60°
28
69°
60°
29
71°
59°
30
77°
60°
31
77°
59°
1
70°
58°
2
68°
58°
3
71°
59°
4
75°
59°
5
75°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Mackinac Island
Mackinac Island's August 2026 forecast shows daily high temperatures ranging from 68° to 79°, with overnight lows between 56° and 63°. The average high for August is 73° with an average low of 60°. 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 Mackinac Island. See also: September | October | November.
