Mackinac Island, MI Weather & Growing Conditions
Overnight
48°F
Partly Cloudy
Partly cloudy. Low around 48, with temperatures rising to around 51 overnight. Southeast wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Partly Cloudy | 5 to 10 mph SE | 1% |
| Saturday | 63°F | Partly Sunny | 10 to 15 mph E | 10% |
| Saturday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph E | 19% |
| Sunday | 66°F | Mostly Sunny | 10 mph NE | 11% |
| Sunday Night | 46°F | Partly Cloudy | 10 to 15 mph NE | 0% |
| Monday | 59°F | Partly Sunny | 10 to 15 mph E | 0% |
| Monday Night | 46°F | Partly Cloudy | 5 to 10 mph E | 0% |
| Tuesday | 59°F | Sunny | 10 to 15 mph E | 0% |
| Tuesday Night | 49°F | Mostly Clear | 10 to 15 mph E | 1% |
| Wednesday | 60°F | Sunny | 15 mph E | 6% |
| Wednesday Night | 49°F | Partly Cloudy | 10 to 15 mph E | 6% |
| Thursday | 64°F | Mostly Sunny | 10 mph E | 6% |
| Thursday Night | 50°F | Partly Cloudy | 5 to 10 mph E | 4% |
| Friday | 67°F | Mostly Sunny | 5 mph E | 2% |
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 Sep 19, 2026.