A computer's guess at future radar. The rock does not endorse the future.
2h agonow+30m
The Rocktionary: every weather term, explained by a rock
Rockreation: pick a game
Hanging out: Tic Tac Toe
The Rockord Book
All records live on this device. The rock keeps no receipts. You keep them.
Rock, Time, Weather
?vs?
Time grinds rock. Rock endures weather. Weather does not care what year it is.
The weather you throw is whatever is outside right now.
Rocktoid or Rubbish
Rocktoid, or rubbish?
Warmer or Colder
Asking both towns...
or
Name That Sky
What is the rock standing in?
Weather Rocktoid
A new Rocktoid every midnight. The rock reads a lot.
The rock's instrument panel
Reading the instruments...
Remote Rocks: station a rock anywhere you love
Put a rock in Mom's yard, the lake house, a kid's college town. Each one stands in that sky and reports it here. Tap a rock for its forecast; the pencil renames it.
Tap me on the shoulder turns on browser notifications: when a warning or watch lands on one of your rocks, you get a notification, as long as the site is open in a tab somewhere.
Remote Rocks live on this device. We do not track you, so a rock you station on your phone will not appear on your computer or tablet, and the other way around. That is the privacy working, not a bug. Forecasts and alerts travel from here straight to the weather services, same as always.
Settings
ToneHow the site dresses. System follows your device.
Shoulder tapsBrowser notifications when a warning lands on one of your Remote Rocks. Only while the site is open in a tab.
Keep me in your pocketPut the rock on your home screen. Same site, no store, no middleman, and it opens even with no signal.
This deviceEverything the rock remembers lives right here: your town, your rocks, your settings, your tic tac toe record. One tap and it is all forgotten.
Build
Keep me in your pocket
Same site, no store, no middleman. I get my own icon, I open full screen, and I still open when you have no signal.
Tap your browser's own Share or menu button: the square with the arrow on an iPhone, the ⋮ or ⋯ menu in the corner on most others. It has to be the browser's button; websites are not allowed to press it for you.
Find and tap Add to Home Screen. Some browsers call it Install.
Confirm. That is the whole ceremony.
Big Coppitt Key, FL Weather
Big Coppitt Key, Florida sits at 24.5802, -81.6522. Its warmest month is August, when the day usually reaches 91F, and its coldest is January, when the night usually falls to 65F. September is the wettest, with rain on about 14 days. The hottest day in the station record is 103F on September 22, 2017, and the coldest night 43F on January 13, 1981. 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 Big Coppitt Key weather
Big Coppitt Key sits at 24.5802, -81.6522 and covers about 1.154 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 Big Coppitt Key
Big Coppitt Key is warmest in August, when the day usually reaches 91F, and coldest in January, when the night usually falls to 65F. September is the wettest month, with rain on about 14 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
76F
65F
8
February
78F
67F
5
March
80F
69F
5
April
83F
73F
5
May
86F
76F
7
June
89F
79F
10
July
90F
80F
10
August
91F
80F
12
September
89F
79F
14
October
86F
77F
11
November
81F
72F
6
December
78F
68F
6
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Key West Nas station 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.
Big Coppitt Key weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Big Coppitt Key: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Big Coppitt Key weather records
In 93,344 days of observations Big Coppitt Key has been as hot as 103F and as cold as 43F. Not averages: the actual days.
Hottest day
103F
September 22, 2017
Coldest night
43F
January 13, 1981
Wettest day
10.62 in
August 26, 2005
NOAA GHCN daily station records, observed 1945 to 2025: temperature at the Key West Nas station, 2 miles away; snowfall at the Key W Intl Ap station, 6.7 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 Big Coppitt Key weather
Common questions
What is the weather usually like in Big Coppitt Key, FL?
Big Coppitt Key is warmest in August, when the day usually reaches 91F, and coldest in January, when the night usually falls to 65F. Rain falls on roughly 99 days a year, most often in September. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Big Coppitt Key, FL?
About 99 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. September is the wettest month with rain on about 14 of its days, and February the driest with about 5.
What is the hottest it has ever been in Big Coppitt Key, FL?
The hottest day measured for Big Coppitt Key reached 103F on September 22, 2017, and the coldest night 43F on January 13, 1981. Both are real NOAA station measurements from the GHCN daily archive, observed 1945 to 2025, at the Key West Nas station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Big Coppitt Key, FL?
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 Big Coppitt Key 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.