Grand Marais, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Marais, a community in Alger County, Michigan.
Today
85°F
Mostly Cloudy then Showers And Thunderstorms Likely
Showers and thunderstorms likely after 2pm. Mostly cloudy. High near 85, with temperatures falling to around 72 in the afternoon. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Marais
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Cloudy then Showers And Thunderstorms Likely | 10 to 15 mph SW | 60% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 5 mph W | 43% |
| Wednesday | 75°F | Mostly Sunny | 5 mph NW | 9% |
| Wednesday Night | 60°F | Partly Cloudy | 5 mph SE | 0% |
| Thursday | 84°F | Sunny | 5 to 10 mph S | 3% |
| Thursday Night | 66°F | Mostly Clear | 5 to 15 mph S | 3% |
| Friday | 87°F | Sunny | 10 to 15 mph SW | 14% |
| Friday Night | 64°F | Chance Rain Showers | 10 to 15 mph S | 38% |
| Saturday | 77°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph W | 26% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms | 5 mph SW | 41% |
| Sunday | 76°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 36% |
| Sunday Night | 60°F | Chance Showers And Thunderstorms | 5 mph W | 33% |
| Monday | 74°F | Partly Sunny | 5 to 10 mph W | 13% |
| Monday Night | 58°F | Slight Chance Rain Showers | 5 to 10 mph NW | 18% |
Forecast source: National Weather Service (api.weather.gov) for Grand Marais (46.676, -85.966). Updated through the day.
Growing snapshot for Grand Marais
Last spring frost
May 27
First fall frost
Oct 10
Growing season
138 days
Hardiness zone
5b
More local growing data for Grand Marais: nearby ZIP 49839 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grand Marais 2 E, Mi (10.4 mi from Grand Marais). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.