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Mackinac Island Weather

Mackinac Island 14 Days Forecast

19.09
sat

Day

57°F

W 14 mph

Precip.
5%

Night

57°F

NW 5 mph

Precip.
21%

20.09
sun

Day

57°F

SW 9 mph

Precip.
14%

Night

52°F

SW 19 mph

Precip.
20%

21.09
mon

Day

50°F

W 21 mph

Precip.
17%

Night

54°F

W 20 mph

Precip.
14%

22.09
tue

Day

52°F

W 20 mph

Precip.
4%

Night

57°F

W 19 mph

Precip.
4%

23.09
wed

Day

54°F

W 21 mph

Precip.
7%

Night

54°F

W 8 mph

Precip.
8%

24.09
thu

Day

54°F

SW 6 mph

Precip.
11%

Night

55°F

W 6 mph

Precip.
6%

25.09
fri

Day

55°F

E 4 mph

Precip.
6%

Night

59°F

NE 4 mph

Precip.
4%

26.09
sat

Day

59°F

NW 7 mph

Precip.
3%

Night

59°F

NE 9 mph

Precip.
17%

27.09
sun

Day

61°F

N 6 mph

Precip.
10%

Night

59°F

NE 4 mph

Precip.
22%

28.09
mon

Day

61°F

NE 10 mph

Precip.
21%

Night

54°F

NE 14 mph

Precip.
31%

29.09
tue

Day

50°F

SW 13 mph

Precip.
17%

Night

54°F

W 13 mph

Precip.
8%

30.09
wed

Day

52°F

W 17 mph

Precip.
24%

Night

55°F

SW 15 mph

Precip.
8%

01.10
thu

Day

55°F

W 20 mph

Precip.
22%

Night

55°F

W 18 mph

Precip.
42%

02.10
fri

Day

55°F

W 10 mph

Precip.
11%

Night

61°F

NW 8 mph

Precip.
13%

sea water
temperature

Mackinac Island

monthly
weather

Mackinac Island

current
weather

Mackinac Island

7 days
forecast

Mackinac Island

January
February
March
April

May
June
July
August

September
October
November
December

Show year:

2026

2025

2024

The average sea water temperature in September of 2026 was 64.7°F. The highest and lowest sea temperatures during the month were 67.3°F and 61.5°F.

Show year:

2025

2024

2023

The average sea water temperature in October of 2025 was 58.1°F. The highest and lowest sea temperatures during the month were 62.8°F and 52.2°F.