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
74°F
Chance Rain Showers then Partly Sunny
A chance of rain showers before 11am. Partly sunny. High near 74, with temperatures falling to around 70 in the afternoon. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
7-day forecast for Copper Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Chance Rain Showers then Partly Sunny | 10 to 15 mph W | 29% |
| Tonight | 63°F | Partly Cloudy | 5 to 10 mph W | 1% |
| Wednesday | 73°F | Sunny | 5 mph W | 0% |
| Wednesday Night | 66°F | Mostly Clear | 5 mph S | 0% |
| Thursday | 82°F | Sunny | 5 to 10 mph S | 2% |
| Thursday Night | 70°F | Mostly Clear | 5 to 10 mph S | 5% |
| Friday | 85°F | Sunny | 5 to 10 mph SW | 14% |
| Friday Night | 64°F | Chance Showers And Thunderstorms | 5 mph SW | 30% |
| Saturday | 76°F | Slight Chance Rain Showers | 5 to 10 mph W | 23% |
| Saturday Night | 63°F | Chance Rain Showers | 5 mph W | 38% |
| Sunday | 75°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 28% |
| Sunday Night | 62°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph W | 19% |
| Monday | 73°F | Partly Sunny | 5 mph W | 9% |
| Monday Night | 61°F | Mostly Cloudy | 5 mph W | 13% |
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 Aug 4, 2026.