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
63°F
Mostly Cloudy
Mostly cloudy. High near 63, with temperatures falling to around 61 in the afternoon. East wind around 5 mph.
7-day forecast for Mackinac Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 63°F | Mostly Cloudy | 5 mph E | 0% |
| Tonight | 50°F | Mostly Cloudy | 5 to 10 mph E | 0% |
| Saturday | 64°F | Mostly Sunny | 10 to 15 mph SE | 5% |
| Saturday Night | 50°F | Mostly Cloudy | 10 to 15 mph NE | 14% |
| Sunday | 67°F | Mostly Sunny | 10 mph N | 10% |
| Sunday Night | 47°F | Partly Cloudy | 10 to 15 mph NE | 0% |
| Monday | 59°F | Partly Sunny | 10 to 15 mph E | 0% |
| Monday Night | 47°F | Partly Cloudy | 10 to 15 mph E | 0% |
| Tuesday | 61°F | Mostly Sunny | 15 mph E | 1% |
| Tuesday Night | 49°F | Partly Cloudy | 10 to 15 mph E | 5% |
| Wednesday | 62°F | Sunny | 15 mph E | 14% |
| Wednesday Night | 50°F | Partly Cloudy | 10 to 15 mph E | 14% |
| Thursday | 65°F | Mostly Sunny | 10 mph E | 4% |
| Thursday Night | 51°F | Partly Cloudy | 5 to 10 mph NE | 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 Sep 18, 2026.