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Mackinac Island, MI Weather
Mackinac Island, Michigan sits at 45.8602, -84.6258. Its warmest month is July, when the day usually reaches 77F, and its coldest is February, when the night usually falls to 10F. January is the wettest, with rain on about 16 days. The hottest day in the station record is 104F on August 6, 1947, and the coldest night -35F on February 9, 1934. This page carries live conditions, an hour by hour timeline, a ten day outlook, radar, monthly averages and searchable daily history back to 1940.
About Mackinac Island weather
Mackinac Island sits at 45.8602, -84.6258 and covers about 4.353 square miles. The forecast above is live: current conditions lead with the HRRR model, corrected against the nearest reporting station and against radar overhead, because a model can lag a storm and the radar cannot.
The tabs at the top of this page carry the hour by hour timeline, the ten day outlook and live radar. Where the models disagree about a day, the rock says so on the day rather than quietly picking a winner.
The rock grades itself against what actually happened and publishes the result whether it flatters it or not. Those standings live in the Receipts.
Where these numbers come from
Current conditions and forecast: NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
Radar: NOAA MRMS merged reflectivity, rendered into tiles by myweatherrock.
Monthly averages and records: computed by myweatherrock from NOAA GHCN-Daily station records at the nearest qualifying station, named on this page with its distance. Measurements, not estimates.
Daily history search: the town's own NOAA GHCN-Daily station file, held on our server, measurements by day. Months the station missed fall back to the Open-Meteo historical archive (reanalysis), and the page says so when it does.
What the weather is usually like in Mackinac Island
Mackinac Island is warmest in July, when the day usually reaches 77F, and coldest in February, when the night usually falls to 10F. January is the wettest month, with rain on about 16 days of it.
Usual high and low, by month
Days with rain, by month
The same year as numbers
Month
Usual high
Usual low
Rain days
Snow days
January
27F
12F
16
12
February
29F
10F
11
9
March
38F
18F
10
5
April
49F
30F
11
2
May
62F
41F
12
0
June
72F
52F
11
0
July
77F
58F
11
0
August
77F
57F
10
0
September
70F
49F
13
0
October
56F
39F
16
0
November
44F
30F
15
4
December
33F
20F
15
10
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Cheboygan station 16.2 miles away. A rain day means at least a hundredth of an inch fell, the same measurable-precipitation mark the Weather Service uses. Source: computed from the station record, NOAA GHCN daily.
Mackinac Island weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Mackinac Island: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Mackinac Island weather records
In 178,815 days of observations Mackinac Island has been as hot as 104F and as cold as -35F. Not averages: the actual days.
Hottest day
104F
August 6, 1947
Coldest night
-35F
February 9, 1934
Wettest day
4.48 in
August 2, 2001
Biggest snow
21.0 in
March 16, 2026
NOAA GHCN daily station records, observed 1891 to 2026: temperature at the Cheboygan station, 16.2 miles away. Station measurements, not estimates. Record dates reflect the station's own observation schedule, and the official state record may live at a different station.
Common questions about Mackinac Island weather
Common questions
What is the weather usually like in Mackinac Island, MI?
Mackinac Island is warmest in July, when the day usually reaches 77F, and coldest in February, when the night usually falls to 10F. Rain falls on roughly 151 days a year, most often in January. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Mackinac Island, MI?
About 151 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. January is the wettest month with rain on about 16 of its days, and March the driest with about 10.
Does it snow in Mackinac Island, MI?
Yes. Snow falls on about 42 days a year, most often in January, which averages about 12 snowy days. Those are days with measurable snowfall, not days with snow lying on the ground.
What is the hottest it has ever been in Mackinac Island, MI?
The hottest day measured for Mackinac Island reached 104F on August 6, 1947, and the coldest night -35F on February 9, 1934. Both are real NOAA station measurements from the GHCN daily archive, observed 1891 to 2026, at the Cheboygan station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Mackinac Island, MI?
Yes, and for free. The History tab on this page takes any month back to 1940 and shows every day of it: the high, the low, what fell, and that month's hottest and coldest day. No account and no payment.
Is the Mackinac Island forecast on this page free, and does it track me?
It is free, carries no advertising, and needs no account. Nothing about a visitor leaves the device except the coordinates needed to fetch a forecast, and those are not stored against anyone.