Mackinac Island, MI Weather & Growing Conditions
Today
85°F
Sunny
Sunny, with a high near 85. Southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 5 to 10 mph SW | 1% |
| Tonight | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph NW | 74% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 5 mph N | 68% |
| Wednesday Night | 59°F | Mostly Cloudy | 0 to 5 mph N | 10% |
| Thursday | 80°F | Mostly Sunny | 5 mph E | 9% |
| Thursday Night | 62°F | Mostly Clear | 5 mph S | 5% |
| Friday | 84°F | Sunny | 5 to 10 mph SW | 0% |
| Friday Night | 65°F | Mostly Clear | 5 to 10 mph SW | 10% |
| Saturday | 82°F | Sunny then Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 17% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 33% |
| Sunday | 82°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 40% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 5 to 10 mph NW | 37% |
| Monday | 80°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph W | 19% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 5 to 10 mph NW | 28% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mackinac Island, MI
Last spring frost
May 11
First fall frost
Oct 11
Growing season
152 days
Hardiness zone
5b
Explore more for Mackinac Island, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Cheboygan, Mi (8.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.