Grand Marais, MN Weather & Growing Conditions
Tonight
47°F
Slight Chance Rain Showers
A slight chance of rain showers before 2am. Mostly cloudy. Low around 47, with temperatures rising to around 49 overnight. North wind 0 to 5 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Slight Chance Rain Showers | 0 to 5 mph N | 20% |
| Sunday | 58°F | Partly Sunny | 5 to 10 mph NE | 2% |
| Sunday Night | 38°F | Mostly Cloudy | 0 to 5 mph NE | 0% |
| Monday | 55°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Monday Night | 36°F | Mostly Clear then Patchy Frost | 0 to 5 mph E | 0% |
| Tuesday | 58°F | Patchy Frost then Sunny | 0 to 5 mph E | 0% |
| Tuesday Night | 39°F | Mostly Clear | 0 to 5 mph E | 0% |
| Wednesday | 60°F | Sunny | 0 to 5 mph SE | 0% |
| Wednesday Night | 42°F | Mostly Clear | 0 to 5 mph E | 0% |
| Thursday | 62°F | Mostly Sunny | 0 to 5 mph SE | 3% |
| Thursday Night | 45°F | Mostly Cloudy | 0 to 5 mph NE | 6% |
| Friday | 66°F | Mostly Sunny | 0 to 5 mph SW | 6% |
| Friday Night | 48°F | Partly Cloudy | 0 mph | 3% |
| Saturday | 66°F | Mostly Sunny | 0 to 5 mph SW | 10% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grand Marais, MN
Last spring frost
May 24
First fall frost
Sep 29
Growing season
127 days
Hardiness zone
4a
Explore more for Grand Marais, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Grand Portage, Mn (15.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.