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
62°F
Partly Sunny
Partly sunny, with a high near 62. South wind 5 to 10 mph.
7-day forecast for Copper Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Partly Sunny | 5 to 10 mph S | 2% |
| Tonight | 51°F | Mostly Cloudy | 0 to 10 mph N | 13% |
| Sunday | 58°F | Partly Sunny | 15 to 20 mph NE | 11% |
| Sunday Night | 49°F | Partly Cloudy | 10 to 15 mph NE | 0% |
| Monday | 58°F | Mostly Sunny | 5 to 10 mph E | 0% |
| Monday Night | 49°F | Mostly Clear | 0 to 5 mph E | 0% |
| Tuesday | 60°F | Sunny | 0 to 10 mph E | 0% |
| Tuesday Night | 52°F | Mostly Clear | 5 to 10 mph SE | 0% |
| Wednesday | 61°F | Sunny | 5 to 10 mph SE | 1% |
| Wednesday Night | 52°F | Mostly Clear | 5 to 10 mph SE | 1% |
| Thursday | 62°F | Sunny | 5 mph SE | 1% |
| Thursday Night | 54°F | Mostly Clear | 0 to 5 mph S | 3% |
| Friday | 65°F | Sunny | 0 to 5 mph S | 3% |
| Friday Night | 55°F | Partly Cloudy | 5 mph S | 1% |
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 Sep 19, 2026.