Grand Marais, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Marais, a community in Alger County, Michigan.
This Afternoon
68°F
Partly Sunny
Partly sunny, with a high near 68. Southeast wind around 5 mph.
7-day forecast for Grand Marais
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Partly Sunny | 5 mph SE | 2% |
| Tonight | 52°F | Mostly Cloudy | 5 to 10 mph E | 4% |
| Sunday | 60°F | Mostly Sunny | 10 to 20 mph NE | 3% |
| Sunday Night | 46°F | Partly Cloudy | 10 to 20 mph NE | 0% |
| Monday | 60°F | Partly Sunny | 10 mph E | 0% |
| Monday Night | 44°F | Partly Cloudy | 5 to 10 mph E | 0% |
| Tuesday | 63°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 48°F | Mostly Clear | 5 to 10 mph E | 1% |
| Wednesday | 66°F | Sunny | 10 mph E | 3% |
| Wednesday Night | 50°F | Mostly Clear | 5 to 10 mph SE | 3% |
| Thursday | 67°F | Sunny | 5 to 10 mph E | 1% |
| Thursday Night | 52°F | Partly Cloudy | 5 to 10 mph SE | 1% |
| Friday | 69°F | Mostly Sunny | 5 mph E | 1% |
| Friday Night | 53°F | Partly Cloudy | 5 mph SE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Grand Marais (46.676, -85.966). Updated through the day.
Growing snapshot for Grand Marais
Last spring frost
May 27
First fall frost
Oct 10
Growing season
138 days
Hardiness zone
5b
More local growing data for Grand Marais: nearby ZIP 49839 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grand Marais 2 E, Mi (10.4 mi from Grand Marais). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.