Grand Marais, MN Weather & Growing Conditions
Today
73°F
Mostly Sunny
Mostly sunny, with a high near 73. West wind 5 to 10 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Mostly Sunny | 5 to 10 mph W | 3% |
| Tonight | 48°F | Mostly Clear | 0 to 5 mph W | 0% |
| Wednesday | 72°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 53°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Thursday | 77°F | Mostly Sunny | 5 to 10 mph SW | 3% |
| Thursday Night | 59°F | Partly Cloudy | 5 mph SW | 4% |
| Friday | 80°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 22% |
| Friday Night | 55°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph W | 30% |
| Saturday | 75°F | Slight Chance Rain Showers | 5 to 10 mph W | 20% |
| Saturday Night | 55°F | Chance Rain Showers | 0 to 5 mph NW | 25% |
| Sunday | 75°F | Chance Rain Showers then Mostly Sunny | 5 to 10 mph W | 25% |
| Sunday Night | 54°F | Partly Cloudy | 0 to 5 mph NW | 9% |
| Monday | 75°F | Partly Sunny | 0 to 5 mph NW | 10% |
| Monday Night | 53°F | Slight Chance Rain Showers | 0 to 5 mph NW | 15% |
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 Aug 4, 2026.