Mackinac Island, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mackinac Island, a city in Mackinac County, Michigan.
This Afternoon
64°F
Showers And Thunderstorms
A chance of rain showers before 4pm, then showers and thunderstorms. Mostly cloudy. High near 64, with temperatures falling to around 59 in the afternoon. Southeast wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Mackinac Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Showers And Thunderstorms | 10 mph SE | 87% |
| Tonight | 47°F | Showers And Thunderstorms | 10 to 15 mph SW | 95% |
| Thursday | 53°F | Rain Showers | 10 to 15 mph SW | 91% |
| Thursday Night | 34°F | Rain Showers then Rain And Snow Showers Likely | 20 to 25 mph N | 92% |
| Friday | 44°F | Rain And Snow Showers Likely | 15 to 20 mph N | 68% |
| Friday Night | 32°F | Chance Rain And Snow Showers then Mostly Cloudy | 10 to 15 mph N | 32% |
| Saturday | 46°F | Sunny | 5 to 10 mph NW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 10 to 15 mph W | 0% |
| Sunday | 51°F | Mostly Sunny then Slight Chance Rain Showers | 15 mph W | 16% |
| Sunday Night | 38°F | Slight Chance Rain Showers then Partly Cloudy | 10 to 15 mph NW | 16% |
| Monday | 52°F | Mostly Sunny | 10 to 15 mph W | 2% |
| Monday Night | 41°F | Partly Cloudy | 15 mph W | 1% |
| Tuesday | 51°F | Mostly Sunny | 10 to 15 mph NW | 4% |
| Tuesday Night | 37°F | Mostly Cloudy | 10 to 15 mph NW | 4% |
Forecast source: National Weather Service (api.weather.gov) for Mackinac Island (45.860, -84.626). Updated through the day.
Growing snapshot for Mackinac Island
Last spring frost
May 16
First fall frost
Oct 13
Growing season
149 days
Hardiness zone
5b
More local growing data for Mackinac Island: nearby ZIP 49757 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, St Ignace, Mi (4.5 mi from Mackinac Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.