Grand Marais, MN Weather & Growing Conditions
Overnight
47°F
Light Rain
Rain and patchy fog. Cloudy, with a low around 47. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Light Rain | 10 to 15 mph NE | 88% |
| Wednesday | 50°F | Rain | 10 mph NE | 95% |
| Wednesday Night | 32°F | Light Rain | 10 to 15 mph N | 85% |
| Thursday | 38°F | Slight Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 23% |
| Thursday Night | 21°F | Mostly Cloudy | 0 to 10 mph N | 1% |
| Friday | 39°F | Sunny | 0 mph | 0% |
| Friday Night | 21°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 43°F | Mostly Sunny | 0 to 5 mph SW | 1% |
| Saturday Night | 29°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph W | 15% |
| Sunday | 45°F | Mostly Sunny | 5 to 10 mph NW | 13% |
| Sunday Night | 29°F | Mostly Cloudy | 0 to 5 mph W | 3% |
| Monday | 49°F | Partly Sunny | 5 mph SW | 5% |
| Monday Night | 31°F | Mostly Cloudy | 5 to 10 mph NW | 8% |
| Tuesday | 45°F | Mostly Sunny | 5 mph NW | 7% |
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 Nov 4, 2026.