Climate and monthly weather forecastMackinac Island, MI
Mackinac Island, Michigan, USA - Climate and weather forecast by month. Detailed climate information with charts - average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and UV index data. The month with the most snowfall in Mackinac Island, Michigan, is January, when snow falls for 21.9 days and typically aggregates up to 5.91" (150mm) of snow. January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Mackinac Island, Michigan.
Climate and monthly weather forecast
The climate of Mackinac Island
Mackinac Island, located in Michigan in the United States, classifies as a Humid Continental climate, per the Köppen Climate Classification system. Also known as Dfb, this climate type describes regions without a dry season, but a warm summer. The geographical position of Mackinac Island, in the northern climes of the United States, contributes to its experience of the Dfb climate.Throughout the year, there is a stark difference in temperatures. The island witnesses the highest average temperatures from June to August, peaking in July at 71.4°F (21.9°C). The lowest temperatures are recorded in January and February. Similarly, a distinct variation exists in the average minimum temperatures. The lowest average low temperatures are found in January and February, dipping to a chilly 14.4°F (-9.8°C), and soaring to a balmy average low of 58.6°F (14.8°C) in August.
Regarding precipitation, rainfall is observed throughout the year. The greatest rainfall occurs in April, with an average of 2.36" (60mm), and also sees scattered showers in October, with 2.72" (69mm) of rainfall. Contrarily, the lowest precipitation happens in January with average rainfall of 1.3" (33mm). As expected in this climate type, snowfall is predominantly prevalent in the winter months, with December through February experiencing considerable snowfall.
The best time to visit Mackinac Island
Based on the favorable weather conditions, the ideal period to visit Mackinac Island extends from June to August. During these months, the temperatures range from 63.5°F (17.5°C) to 71.4°F (21.9°C), creating comfortable conditions to explore the island's outdoor attractions. The daylight hours peak during these months, with approximately 15 hours of daylight available per day, augmenting the enjoyment of outdoor activities. The relative humidity during this period ranges from 77% to 78%, which is comfortable for most people.The worst time to visit Mackinac Island
The least agreeable time to plan a visit to Mackinac Island is during the peak of winter, between December and February. During this period, the average high temperature stays below freezing, ranging from 23.4°F (-4.8°C) to 32.7°F (0.4°C). Minimum temperatures drop significantly, going from 14.7°F (-9.6°C) to 22.3°F (-5.4°C). Additionally, the island experiences heavy snowfall, measuring on average from 3.54" (90mm) to 5.91" (150mm), coupled with limited daylight hours — an average of between 8.7 hours to 9.1 hours.Spring weather in Mackinac Island
The arrival of spring, from March to May, brings a gradual rise in temperatures. The average high temperature increases from 42.3°F (5.7°C) to 55°F (12.8°C), whereas the average low rises from 31.8°F (-0.1°C) to 41.4°F (5.2°C). Rainfall also escalates, with precipitation starting from 1.5" (38mm) in March to 1.69" (43mm) in May. In terms of daylight hours, there is a significant increment from 12 hours to 15 hours.Summer weather in Mackinac Island
Summer on Mackinac Island, from June to August, is marked by warm temperatures and extended daylight hours. The average high temperatures hover between 63.5°F (17.5°C) and 71.4°F (21.9°C), whereas the low averages from 49.5°F (9.7°C) to 58.6°F (14.8°C). While rainfall occurs in these months, it falls as low as 1.46" (37mm), ensuring a largely clear and sunny weather.Autumn weather in Mackinac Island
The autumn season, from September to November, witnesses a decline in temperatures, moving from a high of 64.8°F (18.2°C) to 40.3°F (4.6°C). During the same period, the average low also falls from 53.1°F (11.7°C) to 32.9°F (0.5°C). Notably, rainfall is the highest in October, with an average of 2.72" (69mm), making it the wettest month on Mackinac Island.Winter weather in Mackinac Island
Winters on Mackinac Island, from December to February, are cold and snowy. During this time, the highest temperatures drop down from 30.2°F (-1°C) in December to as low as 23.4°F (-4.8°C) in January. The average low temperatures range between 14.7°F (-9.6°C) and 23°F (-5°C). Snowfall reaches its peak during these months, going as high as 5.91" (150mm) in December.Weather in January
January brings a decidedly winter pattern to Mackinac Island, Michigan as the first month of the year. A characteristic cold, with temperatures dropping to an average lower limit of 14.7°F (-9.6°C), dominates this month. Despite the chill in the air, the island is shrouded in considerable cloud cover, significantly reducing the available daylight. Weather in January »Weather in February
Moving into February, the weather on Mackinac Island remains in the firm grip of winter. Cold temperatures persist, albeit slightly more moderate compared to January. Daylight lengthens to about 10.4 hours, but clouds often mute its presence. Weather in February »Weather in March
March brings a noticeable change in the Mackinac Island weather narrative. Average temperatures rise to a high of 32.7°F (0.4°C) signalling a gradual transition towards spring. The snowfall decreases correspondingly, but a greater frequency of rainy days ensures maintainance of humidity levels. Weather in March »Weather in April
April in Mackinac Island is characterized by a significant rise in temperature to a high of 42.3°F (5.7°C) as spring solidifies its hold. The weather becomes noticeably wetter with a rainfall average of 2.36" (60mm), marking it the start of the rainier half of the year. Weather in April »Weather in May
May brings a harmonious blend of moderate temperatures and rainfall to Mackinac Island. Warming trends continue and the island is transformed by abundant flora. The rains, average of 1.69" (43mm), work in concert with the sun to nurture the sprouting greenery. Weather in May »Weather in June
June marks the start of summer on Mackinac Island with higher temperatures reaching an average high of 63.5°F (17.5°C). The extended daylight hours from 15 to 15.7 hours work hand in hand with the warm weather to invigorate the island's amenities. Weather in June »Weather in July
July signifies the height of summer on Mackinac Island. The Island experiences its warmest weather, an average high reaching up to 71.4°F (21.9°C). The days are the longest and the sunshine reaches its zenith. Despite the scorching sun, generous rain ensures the greenery remains hydrated and in full bloom. Weather in July »Weather in August
Mackinac Island in August maintains the summer vibes and high temperatures of 71.1°F (21.7°C). Despite being in the warmer scale, frequent rain and the highest sea temperature of 61°F (16.1°C) balance the heat. The days slowly start to shorten but are still reasonably long providing ample sunlight. Weather in August »Weather in September
September ushers in autumn on Mackinac Island. There is a slight dip in temperatures, setting the stage for the fall. The days start to become shorter and the leaves begin to change their colour. Sunshine hours decrease gradually and the weather becomes more variable. Weather in September »Weather in October
October on Mackinac Island features a pronounced shift in weather. The fall sets in earnest with an average high temperature decreasing to 52.3°F (11.3°C). Progressive shortening of the daylight hours and a simultaneous increase in rainfall add to the overall chill. Weather in October »Weather in November
November brings the first taste of incoming winter to Mackinac Island. The temperatures dip further averaging to a high of 40.3°F (4.6°C), making November cooler than the preceding months. The shorter days and longer nights make the winter near tangible. Weather in November »Weather in December
December seals the onset of winter in Mackinac Island with temperatures dropping to an average high of 30.2°F (-1°C). The daylight hours reach their yearly minimum while the cloud cover increases reciprocally. Snowfall intensifies, typically covering the island in a beautiful layer of white. Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Mackinac Island, the average lowest temperatures are observed in January, with a high of 23.4°F (-4.8°C) and a low of 14.7°F (-9.6°C).
The months with the highest humidity are January and February, with an average relative humidity of 89%.
The month with the least rainfall is January, when the rain falls for 5.8 days and typically collects 1.3" (33mm) of precipitation.
In Mackinac Island, Michigan, during the entire year, the rain falls for 131 days and collects up to 21.22" (539mm) of precipitation.
January through May, October through December are months with snowfall in Mackinac Island.
The month with the most snowfall in Mackinac Island, Michigan, is January, when snow falls for 21.9 days and typically aggregates up to 5.91" (150mm) of snow.
In Mackinac Island, Michigan, during the entire year, snow falls for 93.6 days and aggregates up to 27.91" (709mm) of snow.
January has the least sunshine of the year in Mackinac Island, Michigan, with an average of 1.9h of sunshine.
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Mackinac Island, Michigan.
February through April, with an average ocean temperature of 35.6°F (2°C), are months with the coldest seawater.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Mackinac Island, Michigan, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
The least humid month is May, with an average relative humidity of 75%.
June through September are months without snowfall in Mackinac Island, Michigan.
With an average of 15h and 42min of daylight, June has the longest days of the year in Mackinac Island, Michigan.
The months with the highest UV index in Mackinac Island, Michigan, are June through August, with an average maximum UV index of 5.
In Mackinac Island, July is identified by the average highest temperatures, reaching a peak of 71.4°F (21.9°C) and a low of 57.6°F (14.2°C).
July has the most sunshine of the year in Mackinac Island, Michigan, with an average of 10.1h of sunshine.
The month with the warmest seawater is August, with an average ocean temperature of 60.8°F (16°C).
October is the month with the most rainfall in Mackinac Island, Michigan. Rain falls for 16.5 days and accumulates 2.72" (69mm) of precipitation.
December has the shortest days of the year in Mackinac Island, with an average of 8h and 42min of daylight.
Average temperature
Mackinac Island, MI
The warmest month (with the highest average high temperature) is July (71.4°F).
The month with the lowest average high temperature is January (23.4°F).
The month with the highest average low temperature is August (58.6°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure
Mackinac Island, MI
- Average pressure in January:
30.01"Hg - Average pressure in February:
30.03"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.94"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
29.96"Hg - Average pressure in November:
30.02"Hg - Average pressure in December:
30.02"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Mackinac Island, MI
- Average wind speed in January:
10.4mph - Average wind speed in February:
10mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.5mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
7.6mph - Average wind speed in August:
8.1mph - Average wind speed in September:
8.5mph - Average wind speed in October:
10.3mph - Average wind speed in November:
10.9mph - Average wind speed in December:
10.9mph
The windiest months (with the highest average wind speed) are November and December (10.9mph).
The calmest months (with the lowest average wind speed) are June and July (7.6mph).
Average humidity
Mackinac Island, MI
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (75%).
Average rainfall
Mackinac Island, MI
- Average rainfall in January:
1.3" - Average rainfall in February:
1.34" - Average rainfall in March:
1.5" - Average rainfall in April:
2.36" - Average rainfall in May:
1.69" - Average rainfall in June:
1.93"
- Average rainfall in July:
1.46" - Average rainfall in August:
1.65" - Average rainfall in September:
1.73" - Average rainfall in October:
2.72" - Average rainfall in November:
1.81" - Average rainfall in December:
1.73"
The wettest month (with the highest rainfall) is October (2.72").
The driest month (with the least rainfall) is January (1.3").
Average rainfall days
Mackinac Island, MI
- Average rainfall days in January:
5.8 days - Average rainfall days in February:
5.3 days - Average rainfall days in March:
8.4 days - Average rainfall days in April:
11.9 days - Average rainfall days in May:
13.3 days - Average rainfall days in June:
11.5 days
- Average rainfall days in July:
13 days - Average rainfall days in August:
13.8 days - Average rainfall days in September:
11.4 days - Average rainfall days in October:
16.5 days - Average rainfall days in November:
10.9 days - Average rainfall days in December:
9.2 days
The month with the highest number of rainy days is October (16.5 days).
The month with the least rainy days is February (5.3 days).
Average snowfall
Mackinac Island, MI
- Average snowfall in January:
5.91" - Average snowfall in February:
5.67" - Average snowfall in March:
4.21" - Average snowfall in April:
2.56" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is January (5.91").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Mackinac Island, MI
- Average snowfall days in January:
21.9 days - Average snowfall days in February:
18.3 days - Average snowfall days in March:
12.5 days - Average snowfall days in April:
7.1 days - Average snowfall days in May:
0.8 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
2 days - Average snowfall days in November:
11.8 days - Average snowfall days in December:
19.2 days
The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Mackinac Island, MI
The best month for swimming (with the highest average sea temperature) is August (61°F).
The coldest months (with the lowest average sea temperature) are February, March and April (36°F).
Average daylight / Average sunshine
Mackinac Island, MI
- Average daylight in January:
9h and 12min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 30min - Average daylight in December:
8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in January:
1h and 54min - Average sunshine in February:
2h and 42min - Average sunshine in March:
4h and 42min - Average sunshine in April:
6h and 36min - Average sunshine in May:
8h and 54min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
9h and 54min - Average sunshine in September:
7h and 48min - Average sunshine in October:
4h and 48min - Average sunshine in November:
3h and 42min - Average sunshine in December:
2h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 1h and 54min).
Average sunshine days
Mackinac Island, MI
- Average sunshine days in January:
7.1 days - Average sunshine days in February:
8.6 days - Average sunshine days in March:
12.4 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
15.7 days - Average sunshine days in June:
16.5 days
- Average sunshine days in July:
16.3 days - Average sunshine days in August:
15.4 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
11.5 days - Average sunshine days in November:
11.1 days - Average sunshine days in December:
7.6 days
The month with the most sunshine days is September (16.9 days).
The month with the least sunshine days is January (7.1 days).
Average UV index
Mackinac Island, MI
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover
Mackinac Island, MI
The month with the most cloud cover is January (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility
Mackinac Island, MI
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
