‹ Mackinac Island weather by month
Typical May weather
Mackinac Island
Michigan · May
66° days
38° nights
about 6 rainy days · 15 hours of daylight · lake 49°
What to pack
- Sweater
What May feels like
The Grand Hotel opens and the island properly restarts, gardens going in and fudge kitchens firing up. Nights still want a real coat, but a bike ride around M-185 on an empty May morning is the version of this place everyone pictures.
Expect about 6 days with real rain — enough to notice, not enough to plan around. The air runs dry — whatever the thermometer says, it wears easy. about 8 nights dip below freezing.
Can you swim?
The lake runs about 49° — frigid — locals in wetsuits only.
The numbers
| Typical high | 66° |
|---|---|
| Typical low | 38° |
| Days with real rain | 6 |
| Total rain | 2.8 in |
| Humidity | dry air |
| Water temperature | 49° |
| Sunrise / sunset (mid-month) | 6:06 am / 9:03 pm |