Grand Marais, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Marais, a city in Cook County, Minnesota.
Today
54°F
Rain
Rain before 9am, then rain and patchy fog and a slight chance of thunderstorms. Cloudy. High near 54, with temperatures falling to around 51 in the afternoon. North wind around 10 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Grand Marais
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 54°F | Rain | 10 mph N | 95% |
| Tonight | 36°F | Light Rain | 10 to 15 mph N | 89% |
| Thursday | 43°F | Chance Light Rain then Partly Sunny | 10 to 15 mph N | 37% |
| Thursday Night | 25°F | Partly Cloudy | 5 to 10 mph N | 2% |
| Friday | 41°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Friday Night | 26°F | Mostly Clear | 0 mph | 0% |
| Saturday | 44°F | Mostly Sunny | 0 to 5 mph SW | 1% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph W | 11% |
| Sunday | 48°F | Mostly Sunny | 5 to 10 mph W | 5% |
| Sunday Night | 32°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Monday | 50°F | Partly Sunny then Slight Chance Light Rain | 0 to 10 mph W | 15% |
| Monday Night | 34°F | Partly Cloudy then Slight Chance Light Rain | 5 to 10 mph NW | 16% |
| Tuesday | 47°F | Mostly Sunny | 5 mph NW | 6% |
| Tuesday Night | 31°F | Mostly Cloudy | 0 to 5 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Grand Marais (47.759, -90.344). Updated through the day.
Growing snapshot for Grand Marais
Last spring frost
May 23
First fall frost
Sep 26
Growing season
124 days
Hardiness zone
3b
More local growing data for Grand Marais: nearby ZIP 55604 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Gunflint Lake 10 Nw, Mn (18.2 mi from Grand Marais). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.