SeasonMapMackinac Island weather in July
United States
July in Mackinac Island: warm, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Mackinac Island · #382 of 1383 destinations to visit in July · comfort 87/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Mackinac Island in July
Other months in Mackinac Island
Mackinac Island's forum describes August as pleasant but genuinely variable day to day — layers are the standard advice, since a warm afternoon can follow a cool morning within the same visit. Regulars single out the last week of August specifically: cooler nights, thinner crowds, and still enough warm water for a short dip before Labor Day arrives.
Add your own note from Mackinac Island's card on the map.
Mackinac Island climate normals — July
| Daytime high | 24°C / 74°F | 🌤 warm |
|---|---|---|
| Nighttime low | 16°C / 60°F | |
| Feels like (high) | 25°C / 77°F | |
| Rainfall | 79 mm / 3.1 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 16°C / 60°F | |
| Sunshine | 12.3 h/day | |
| Daylight | 15.3 h | |
| Wind | 19 km/h / 11 mph | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Mackinac Island in July
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsHigh summer, The Mackinac yacht races, Summer break in United States(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Mackinac Island's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherMackinac Island's weather peaks July–September, best around August.
July includes The Mackinac yacht races.
Best weatherFair weatherToughest weather
What's on in Mackinac Island in July
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Rule
No motor vehicles
1 Jan – 31 DecClosuresCars have been banned since 1898, so everything moves by horse, bicycle or foot, including the luggage and the rubbish. Bring shoes you can walk eight miles round the island in. Source ↗
- Season
Grand Hotel's season
1 May – 31 Oct · usuallyOff-season shutdownClosuresThe big porch hotel opens at the start of May and closes at the end of October, and the rest of the island's rooms run a similar window. Outside it there is almost nowhere to stay at all. Source ↗
- Hazard
Black fly and stable fly weeks
15 May – 15 Jul · usuallyInsect seasonBlack flies in late spring, then biting stable flies along the shore from midsummer, worst on a still afternoon. It is a fortnight or two of long sleeves and repellent, and then it passes. Source ↗
- Season
High summer
1 Jul – 25 AugSchool holidaysCrowdedBook earlyFifteen thousand day visitors can land on a good July day on an island of five hundred residents. Main Street is a crush until the last ferry leaves and then it is quiet again. Source ↗
- Festival
The Mackinac yacht races
10–30 Jul · usuallyMajor festivalCrowdedBook earlyTwo of the oldest freshwater distance races in the world finish here in July, from Chicago and from Port Huron. The harbour fills with boats and the town with crews for both weekends. Source ↗
Where is Mackinac Island?
Mackinac Island in July — FAQ
- Is July a good time to visit Mackinac Island?
- July in Mackinac Island: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Mackinac Island on SeasonMap's comfort score (87/100).
- What is the weather like in Mackinac Island in July?
- In July, Mackinac Island averages a daily high of 23.5°C and a low of 15.6°C, with about 79.1 mm of rain over roughly 8.4 rainy days.
- What is the air quality in Mackinac Island in July?
- Mackinac Island has a mean US Air Quality Index of about 44 in July.