Mackinac Island, MI Weather & Growing Conditions
Today
79°F
Sunny
Sunny. High near 79, with temperatures falling to around 77 in the afternoon. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Sunny | 10 to 15 mph SW | 2% |
| Tonight | 62°F | Showers And Thunderstorms Likely | 5 to 15 mph NW | 71% |
| Wednesday | 75°F | Showers And Thunderstorms Likely then Partly Sunny | 5 mph N | 59% |
| Wednesday Night | 60°F | Mostly Cloudy | 5 mph N | 8% |
| Thursday | 76°F | Mostly Sunny | 5 mph SE | 8% |
| Thursday Night | 63°F | Mostly Clear | 5 to 10 mph S | 4% |
| Friday | 78°F | Sunny | 10 mph SW | 0% |
| Friday Night | 66°F | Mostly Clear | 10 mph SW | 13% |
| Saturday | 78°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 18% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms | 5 to 15 mph W | 36% |
| Sunday | 77°F | Chance Showers And Thunderstorms | 10 to 15 mph W | 40% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 10 mph NW | 38% |
| Monday | 76°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 10 mph W | 17% |
| 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 16
First fall frost
Oct 13
Growing season
149 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, St Ignace, Mi (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.