Copper Harbor, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Copper Harbor, a community in Keweenaw County, Michigan.
This Afternoon
59°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 59. South wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast for Copper Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Slight Chance Rain Showers | 5 to 10 mph S | 20% |
| Tonight | 44°F | Rain Showers Likely | 5 to 25 mph NW | 73% |
| Thursday | 44°F | Rain Showers | 25 to 35 mph N | 83% |
| Thursday Night | 33°F | Chance Rain And Snow Showers | 20 to 30 mph N | 46% |
| Friday | 42°F | Partly Sunny | 5 to 20 mph N | 4% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 44°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Saturday Night | 39°F | Partly Cloudy | 5 to 20 mph W | 4% |
| Sunday | 46°F | Mostly Sunny | 20 mph W | 6% |
| Sunday Night | 39°F | Partly Cloudy | 5 to 15 mph W | 6% |
| Monday | 50°F | Partly Sunny | 5 to 15 mph SW | 0% |
| Monday Night | 40°F | Partly Cloudy | 15 mph W | 2% |
| Tuesday | 46°F | Mostly Sunny | 15 to 20 mph NW | 4% |
| Tuesday Night | 37°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph NW | 15% |
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 5, 2026.