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Best time to visit · Michigan, United States
On the climate data, the best time to visit Mackinac Island is June and September, scoring up to 83/100 with highs around 66°F (19°C) and 3.6 in (92 mm) of rain in September. July & August are good shoulder-season months. The toughest months are November – January, mainly because of cool days.
Highs run from 25°F to 72°F across the year, and the yearly total is about 34.4 in (875 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 25°F-4°C | 25°F-4°C | 33°F1°C | 44°F7°C | 54°F12°C | 64°F18°C | 72°F22°C | 72°F22°C | 66°F19°C | 53°F11°C | 41°F5°C | 31°F0°C |
| Avg low | 15°F-9°C | 15°F-10°C | 22°F-6°C | 31°F0°C | 40°F5°C | 51°F10°C | 58°F15°C | 60°F15°C | 54°F12°C | 43°F6°C | 33°F1°C | 23°F-5°C |
| Rain/snow | 1.9 in48 mm | 1.6 in40 mm | 1.9 in47 mm | 3.0 in76 mm | 3.0 in76 mm | 3.3 in85 mm | 3.0 in75 mm | 3.3 in83 mm | 3.6 in92 mm | 4.4 in113 mm | 3.0 in75 mm | 2.6 in65 mm |
| Humidity | 93% | 92% | 87% | 81% | 82% | 83% | 81% | 81% | 81% | 83% | 85% | 90% |
| Cloud | 79% | 76% | 70% | 74% | 77% | 74% | 65% | 62% | 61% | 73% | 79% | 81% |
| Comfort | 43 | 45 | 46 | 47 | 63 | 80 | 76 | 76 | 83 | 57 | 41 | 40 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 191 m (627 ft), close to Mackinac Island's own ~181 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The coldest season, with highs of 25–31°F (-4–0°C) and lows down to 15°F (-10°C). It's the driest season, with only about 6.0 in (153 mm) of rain or snow, 17% of the year's total. December – February are cold enough for snow. It holds the toughest stretch on our comfort score (December & January), averaging 43/100.
Temperatures climb through the season, from 33°F highs in March to 54°F by May. About 7.8 in (199 mm) of rain or snow falls across these months, 23% of the year's total. March is cold enough for snow. Comfort scores sit mid-table, averaging 52/100.
Peak warmth: highs of 64–72°F (18–22°C). About 9.6 in (243 mm) of rain falls across these months, 28% of the year's total. Lows bottom out around 51°F (10°C). June is among the best-scoring months (season average 77/100).
Temperatures slide from 66°F highs in September to 41°F by November. It's the wettest season, with about 11.0 in (280 mm) of rain, 32% of the year's total. Lows bottom out around 33°F (1°C). Comfort peaks here: September ranks with the year's best, and the season averages 60/100.
By comfort score: 4 Great, 1 Good, 4 Fair and 3 Tough. Great months: June – September. Tap a month for its own guide.
On the climate data, the best time to visit Mackinac Island is June and September, scoring up to 83/100 with highs around 66°F (19°C) and 3.6 in (92 mm) of rain in September. July & August are good shoulder-season months. The toughest months are November – January, mainly because of cool days.
October is the wettest month, averaging about 4.4 in (113 mm) of rain. February is the driest, with about 1.6 in (40 mm). The yearly total is around 34.4 in (875 mm).
February is the coldest, with average lows of 15°F (-10°C) and highs of 25°F (-4°C). The warmest is August, with average highs of 72°F (22°C).
Not very: summer (June – August) humidity averages 82%, and highs peak around 72°F (22°C), so it rarely feels sticky.
On average, yes: lows fall below 32°F (0°C) in December – April, bottoming out around 15°F (-10°C) in February.
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