Cool
Average highs are around 19°C, so pack for cooler days.
September verdict
Mackinac Island, United States in September
Weather score33Poor
Poor for holiday weather
Average highs are around 19°C, so pack for cooler days. Sunshine averages 5.5h per day, enough for a balanced month. Rainfall averages 99mm, so some wet days are possible.
September weather
Monthly averages
Temp
19°C
Rain
99mm
Sun
5.5h
Sea
17°C
Weather score
33
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 99mm, so some wet days are possible.
Some sun
Sunshine averages 5.5h per day, enough for a balanced month.
Cool sea
Sea temperatures average 17°C, so the water can feel cool.
Map
Weather map
Compare Mackinac Island, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September19°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September99mm average rain
September is one of Mackinac Island's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to April and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5.5 hours average sun
September sits close to Mackinac Island's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September17°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
September33 weather score
September sits close to Mackinac Island's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
Hotels near Mackinac Island, United States
Marriott
City Express by Marriott Petoskey Harbor SpringsPetoskey, Michigan, USA
Courtyard Petoskey at Victories SquarePetoskey, Michigan, USA
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Residence Inn Traverse CityTraverse City, Michigan, USA
Fairfield Inn & Suites Traverse CityTraverse City, Michigan, USA
Courtyard Traverse CityTraverse City, Michigan, USA