Grand Marais, MN Weather & Growing Conditions
Tonight
42°F
Mostly Cloudy
Mostly cloudy, with a low around 42. Southeast wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 42°F | Mostly Cloudy | 0 to 5 mph SE | 6% |
| Saturday | 67°F | Partly Sunny | 0 mph | 2% |
| Saturday Night | 44°F | Patchy Fog then Mostly Cloudy | 0 to 5 mph N | 6% |
| Sunday | 58°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Sunday Night | 35°F | Mostly Cloudy then Patchy Frost | 0 mph | 0% |
| Monday | 58°F | Patchy Frost then Mostly Sunny | 0 to 5 mph E | 0% |
| Monday Night | 35°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Tuesday | 59°F | Sunny | 0 to 5 mph SE | 0% |
| Tuesday Night | 37°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Wednesday | 61°F | Sunny | 0 to 5 mph SE | 0% |
| Wednesday Night | 40°F | Partly Cloudy | 0 to 5 mph SE | 1% |
| Thursday | 64°F | Mostly Sunny | 0 to 5 mph S | 7% |
| Thursday Night | 44°F | Partly Cloudy | 0 to 5 mph SW | 9% |
| Friday | 67°F | Mostly Sunny | 0 to 5 mph W | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grand Marais, MN
Last spring frost
May 23
First fall frost
Sep 26
Growing season
124 days
Hardiness zone
3b
Explore more for Grand Marais, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Gunflint Lake 10 Nw, Mn (18.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.