Copper Harbor, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Copper Harbor, a community in Keweenaw County, Michigan.
Overnight
52°F
Rain Showers Likely
Rain showers likely and patchy fog. Cloudy, with a low around 52. Southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Copper Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Rain Showers Likely | 5 to 10 mph SE | 61% |
| Wednesday | 61°F | Rain Showers | 10 mph SE | 89% |
| Wednesday Night | 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% |
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.