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Copper Harbor, MI Weather
Copper Harbor, Michigan sits at 47.4679, -87.8699. Its warmest month is July, when the day usually reaches 73F, and its coldest is February, when the night usually falls to 15F. December is the wettest, with rain on about 16 days. The hottest day in the station record is 94F on July 30, 1999, and the coldest night -21F on March 3, 2003. This page carries live conditions, an hour by hour timeline, a ten day outlook, radar, monthly averages and searchable daily history back to 1940.
About Copper Harbor weather
Copper Harbor sits at 47.4679, -87.8699 and covers about 1.513 square miles. The forecast above is live: current conditions lead with the HRRR model, corrected against the nearest reporting station and against radar overhead, because a model can lag a storm and the radar cannot.
The tabs at the top of this page carry the hour by hour timeline, the ten day outlook and live radar. Where the models disagree about a day, the rock says so on the day rather than quietly picking a winner.
The rock grades itself against what actually happened and publishes the result whether it flatters it or not. Those standings live in the Receipts.
Where these numbers come from
Current conditions and forecast: NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
Radar: NOAA MRMS merged reflectivity, rendered into tiles by myweatherrock.
Monthly averages and records: computed by myweatherrock from NOAA GHCN-Daily station records at the nearest qualifying station, named on this page with its distance. Measurements, not estimates.
Daily history search: the town's own NOAA GHCN-Daily station file, held on our server, measurements by day. Months the station missed fall back to the Open-Meteo historical archive (reanalysis), and the page says so when it does.
What the weather is usually like in Copper Harbor
Copper Harbor is warmest in July, when the day usually reaches 73F, and coldest in February, when the night usually falls to 15F. December is the wettest month, with rain on about 16 days of it.
Usual high and low, by month
Days with rain, by month
The same year as numbers
Month
Usual high
Usual low
Rain days
January
26F
16F
14
February
27F
15F
12
March
35F
21F
8
April
45F
31F
10
May
57F
41F
12
June
67F
48F
12
July
73F
57F
9
August
72F
58F
9
September
66F
52F
11
October
52F
41F
15
November
42F
31F
14
December
31F
21F
16
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Copper Harbor station 0.2 miles away. A rain day means at least a hundredth of an inch fell, the same measurable-precipitation mark the Weather Service uses. Source: computed from the station record, NOAA GHCN daily.
Copper Harbor weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Copper Harbor: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Copper Harbor weather records
In 28,685 days of observations Copper Harbor has been as hot as 94F and as cold as -21F. Not averages: the actual days.
Hottest day
94F
July 30, 1999
Coldest night
-21F
March 3, 2003
Wettest day
2.83 in
August 9, 2004
NOAA GHCN daily station records, observed 1998 to 2025: temperature at the Copper Harbor station, 0.2 miles away. Station measurements, not estimates. Record dates reflect the station's own observation schedule, and the official state record may live at a different station.
Common questions about Copper Harbor weather
Common questions
What is the weather usually like in Copper Harbor, MI?
Copper Harbor is warmest in July, when the day usually reaches 73F, and coldest in February, when the night usually falls to 15F. Rain falls on roughly 142 days a year, most often in December. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Copper Harbor, MI?
About 142 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. December is the wettest month with rain on about 16 of its days, and March the driest with about 8.
What is the hottest it has ever been in Copper Harbor, MI?
The hottest day measured for Copper Harbor reached 94F on July 30, 1999, and the coldest night -21F on March 3, 2003. Both are real NOAA station measurements from the GHCN daily archive, observed 1998 to 2025, at the Copper Harbor station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Copper Harbor, MI?
Yes, and for free. The History tab on this page takes any month back to 1940 and shows every day of it: the high, the low, what fell, and that month's hottest and coldest day. No account and no payment.
Is the Copper Harbor forecast on this page free, and does it track me?
It is free, carries no advertising, and needs no account. Nothing about a visitor leaves the device except the coordinates needed to fetch a forecast, and those are not stored against anyone.