Copper Harbor, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Copper Harbor, a community in Keweenaw County, Michigan.
Today
61°F
Rain Showers
Rain showers and areas of fog before 1pm, then areas of fog and a chance of rain showers between 1pm and 2pm, then a chance of rain showers and patchy fog. Mostly cloudy. High near 61, with temperatures falling to around 56 in the afternoon. Southeast wind around 10 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 for Copper Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Rain Showers | 10 mph SE | 89% |
| Tonight | 40°F | Rain Showers Likely | 5 to 15 mph W | 71% |
| Thursday | 45°F | Rain Showers | 25 to 30 mph N | 90% |
| Thursday Night | 32°F | Rain Showers Likely then Slight Chance Rain And Snow Showers | 15 to 25 mph NE | 69% |
| Friday | 42°F | Slight Chance Snow Showers then Partly Sunny | 5 to 15 mph NE | 17% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 44°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 38°F | Partly Cloudy | 5 to 15 mph W | 10% |
| Sunday | 45°F | Partly Sunny | 15 to 20 mph W | 13% |
| Sunday Night | 38°F | Mostly Cloudy | 10 to 15 mph W | 13% |
| Monday | 48°F | Partly Sunny | 5 to 10 mph SW | 9% |
| Monday Night | 39°F | Slight Chance Rain Showers | 10 to 15 mph W | 15% |
| Tuesday | 45°F | Partly Sunny | 15 to 20 mph NW | 14% |
| Tuesday Night | 36°F | Mostly Cloudy | 5 to 10 mph NW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Copper Harbor (47.468, -87.870). Updated through the day.
Growing snapshot for Copper Harbor
Last spring frost
May 20
First fall frost
Oct 15
Growing season
148 days
Hardiness zone
6a
More local growing data for Copper Harbor: nearby ZIP 49918 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Copper Harbor Ft Wilkins, Mi (2.6 mi from Copper Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.