Grand Marais, MN Weather & Growing Conditions
Tonight
51°F
Slight Chance Rain Showers
A slight chance of rain showers before 2am. Mostly cloudy, with a low around 51. Northwest wind 0 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Slight Chance Rain Showers | 0 to 15 mph NW | 20% |
| Sunday | 55°F | Mostly Sunny | 10 to 15 mph NE | 3% |
| Sunday Night | 45°F | Mostly Cloudy | 5 to 10 mph NE | 1% |
| Monday | 54°F | Partly Sunny | 5 to 10 mph E | 1% |
| Monday Night | 43°F | Mostly Clear | 5 to 10 mph NE | 0% |
| Tuesday | 55°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 46°F | Mostly Clear | 5 to 10 mph E | 0% |
| Wednesday | 58°F | Sunny | 5 to 10 mph E | 0% |
| Wednesday Night | 48°F | Mostly Clear | 5 to 10 mph E | 0% |
| Thursday | 58°F | Mostly Sunny | 5 mph SE | 3% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 6% |
| Friday | 61°F | Partly Sunny | 5 mph SW | 6% |
| Friday Night | 52°F | Partly Cloudy | 0 to 5 mph SW | 3% |
| Saturday | 61°F | Partly Sunny | 0 to 10 mph S | 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
4b
Explore more for Grand Marais, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Grand Portage, Mn (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.