S
M
T
W
T
F
S
26
78°
56°
27
76°
53°
28
75°
55°
29
74°
59°
30
79°
57°
31
77°
58°
1
75°
56°
2
75°
56°
3
74°
54°
4
72°
54°
5
74°
55°
6
73°
54°
7
74°
57°
8
74°
59°
9
76°
59°
10
78°
60°
11
79°
61°
12
79°
62°
13
78°
63°
14
80°
59°
15
82°
59°
16
76°
55°
17
78°
52°
18
71°
51°
19
70°
56°
20
74°
58°
21
76°
58°
22
75°
60°
23
76°
54°
24
77°
50°
25
76°
51°
26
71°
51°
27
70°
49°
28
70°
50°
29
74°
56°
30
77°
51°
31
70°
55°
1
73°
56°
2
Hist. Avg.
73°
56°
3
Hist. Avg.
72°
56°
4
Hist. Avg.
72°
56°
5
Hist. Avg.
72°
55°
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 70° to 82°, with overnight lows between 49° and 63°. The average high for August is 75° with an average low of 56°. 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.
