S
M
T
W
T
F
S
26
75°
59°
27
75°
55°
28
76°
55°
29
73°
56°
30
74°
55°
31
74°
55°
1
76°
57°
2
77°
55°
3
75°
60°
4
76°
59°
5
76°
57°
6
75°
58°
7
76°
57°
8
74°
59°
9
73°
58°
10
76°
56°
11
77°
58°
12
79°
61°
13
80°
59°
14
79°
57°
15
79°
54°
16
76°
54°
17
74°
53°
18
72°
54°
19
74°
59°
20
76°
60°
21
81°
61°
22
80°
59°
23
79°
55°
24
75°
54°
25
72°
55°
26
77°
50°
27
70°
51°
28
Hist. Avg.
74°
57°
29
Hist. Avg.
74°
57°
30
Hist. Avg.
73°
57°
31
Hist. Avg.
73°
57°
1
Hist. Avg.
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
*Temporarily Unavailable
August Weather in Mackinac Island
Mackinac Island's August 2026 forecast shows daily high temperatures ranging from 70° to 81°, with overnight lows between 50° and 61°. The average high for August is 76° 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 Mackinac Island. See also: September | October | November.
