Grand Marais, MN Weather & Growing Conditions
Overnight
57°F
Rain Showers
Rain showers. Cloudy. Low around 57, with temperatures rising to around 59 overnight. West wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Rain Showers | 10 mph W | 80% |
| Tuesday | 70°F | Slight Chance Rain Showers then Mostly Sunny | 10 mph NW | 21% |
| Tuesday Night | 46°F | Mostly Clear | 0 to 5 mph W | 0% |
| Wednesday | 72°F | Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph SW | 1% |
| Thursday | 78°F | Mostly Sunny | 5 to 10 mph SW | 7% |
| Thursday Night | 57°F | Partly Cloudy | 5 mph SW | 7% |
| Friday | 79°F | Sunny then Slight Chance Showers And Thunderstorms | 5 mph SW | 24% |
| Friday Night | 53°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph W | 32% |
| Saturday | 73°F | Slight Chance Rain Showers | 5 mph W | 20% |
| Saturday Night | 53°F | Slight Chance Rain Showers | 0 to 5 mph W | 23% |
| Sunday | 74°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 5 mph W | 23% |
| Sunday Night | 52°F | Partly Cloudy | 0 to 5 mph NW | 9% |
| Monday | 75°F | Partly Sunny | 0 to 5 mph NW | 8% |
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 Aug 4, 2026.