Grand Marais, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Marais, a community in Alger County, Michigan.
Today
64°F
Rain Showers
Rain showers before noon, then rain showers likely and patchy fog. Mostly cloudy. High near 64, with temperatures falling to around 60 in the afternoon. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Marais
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Rain Showers | 10 to 15 mph S | 83% |
| Tonight | 48°F | Chance Rain Showers | 10 mph S | 35% |
| Thursday | 53°F | Rain Showers | 10 to 30 mph W | 98% |
| Thursday Night | 32°F | Rain Showers | 25 to 30 mph N | 98% |
| Friday | 43°F | Chance Rain And Snow Showers | 20 to 30 mph NE | 39% |
| Friday Night | 31°F | Slight Chance Rain Showers then Partly Cloudy | 10 to 20 mph N | 19% |
| Saturday | 45°F | Sunny | 5 to 10 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 15 mph W | 15% |
| Sunday | 48°F | Chance Rain Showers | 15 to 25 mph W | 25% |
| Sunday Night | 37°F | Chance Rain Showers then Mostly Cloudy | 15 to 20 mph NW | 25% |
| Monday | 51°F | Partly Sunny | 10 to 15 mph SW | 8% |
| Monday Night | 39°F | Slight Chance Rain Showers | 15 to 20 mph W | 15% |
| Tuesday | 49°F | Slight Chance Rain Showers | 20 to 25 mph NW | 15% |
| Tuesday Night | 36°F | Slight Chance Rain Showers then Mostly Cloudy | 15 to 20 mph NW | 15% |
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 Nov 4, 2026.