Mackinac Island (MI) Temperature by Month
Mackinac Island, Michigan, United States of America has an average annual maximum temperature of 10°C (50°F), ranging from -4°C (25°F) in February to 24°C (75°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Mackinac Island Monthly Temperatures
Visitors to Mackinac Island will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 15°C (59°F) in July to -12°C (10°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Mackinac Island by month:
Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Mackinac Island vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Mackinac Island vs World: Temperature Compared
Mackinac Island's average annual maximum temperature is 10°C (50°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Mackinac Island's weather — including monthly rainfall, sunshine hours, and humidity — visit our Mackinac Island climate page.
