Here’s the mistake I see every single winter.
Somebody books a week on the Gulf coast in January because the flight was cheap and the forecast said 75.
And it is 75.
For about four hours a day.
By 6 p.m. they’re on the beach in a hoodie, and the only people in the water are wearing wetsuits.
It’s the one thing every “warmest places in Florida” list skips.
In winter the afternoons are almost the same from Key West to Fort Myers.
The nights and the water are what change, and they decide whether your beach week is an actual beach week or a week of walks in a fleece.
So here’s how I’d rank the towns for December through February, with NOAA’s 1991–2020 averages for each, and what I’d tell a friend flying down from somewhere with snow on the car.
The Afternoons Are a Tie. The Nights Are Not.
Look at the average January high and you’d think it doesn’t matter where you go.
Key West: 76°F. Miami: 76°F. Naples: 75°F. Fort Myers: 75°F. Honestly, that’s a rounding error.
Now look at the average January low.
Key West sits around 66°F at night.
Miami drops to 61°F. Naples falls to 56°F and Fort Myers to 54°F. That’s a 12-degree spread at dinner time, and you feel every bit of it in shorts.
Dusk, like in the photo of Miami’s skyline from across the bay, is exactly when the gap starts to show.
Why?
Water.
The Keys are a thin string of islands with the ocean on both sides, so there’s nowhere for cold air to settle.
The Gulf off southwest Florida is shallower and cools more in winter.
NOAA’s numbers just show what your skin figures out the first night.
Key West Is the Only Sure Bet
If the whole point is warm, Key West wins and it isn’t close.
January averages 76°F by day and 66°F at night, and December and February run a couple of degrees warmer than that.
The coldest temperature ever recorded there is 41°F. It has never hit freezing.
The water’s the other half.
The sea around Key West averages about 71°F in January.
That’s not bathwater, but it’s a swim you’ll actually take, not a dare.
Here’s the catch nobody puts in the brochure.
Key West isn’t a great beach town.
The beaches are small, a lot of them are rocky, and Smathers Beach is about as big as it gets.
People go for the sunsets, the boats, the snorkeling trips and the walking.
If you picture wide white sand to the horizon, you’ll be a little let down.
The photo is a pretty typical Key West shoreline: big rocks, a sunset, and not a lot of beach towel space.
It’s also the most expensive option on this list in winter, because everyone else read the same numbers.
Book early, and I mean months, not weeks.
If you’re wondering how the island fits with the rest of the chain, I broke that down in are the Florida Keys the same as Key West.
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Marathon sits about halfway down the Keys, and in January it’s basically Key West’s twin.
NOAA has it at 76°F in the afternoon and 64°F at night, a degree or two cooler after dark and the same warm days.
What you lose is the bar crawl.
What you gain is room.
It’s a fishing and boating town more than a party town, and Sombrero Beach there is one of the nicer stretches of sand in the Keys, with shallow water that warms up fast on a sunny day.
This is where I’d put a family, or anyone who’s done Key West once and liked the weather more than the crowds.
The photo is from Islamorada, about 30 miles up the road, but it’s the same Keys look you get in Marathon: a palm, a fishing boat at the dock and flat, shallow water.
It’s an easy day trip down to Key West if you want one night of it.
Park the car, take a cab back late, and don’t try to find a spot on Duval at 9 p.m. on a Saturday.
Miami Beach Is Warm Until a Front Comes Through
Miami gets you 76°F in January, same as Key West, with nights around 61°F. Most days you won’t care about the gap.
You’ll be on the sand by 11 and back for a nap by 3.
The thing to know is cold fronts.
A few times each winter, a front slides down the peninsula and South Florida gets two or three cool, windy days.
A few times a decade Miami drops below 45°F at night.
When that happens the beach is pretty empty and the locals are in puffer jackets, which is kinda funny to watch if you flew in from Chicago.
On a gray day like the one behind that lifeguard stand, Miami Beach is still a great walk.
It’s just not a swim.
Miami’s real edge is getting there.
More flights, more nonstops, usually cheaper fares, and no 4-hour drive at the end.
If your trip is 4 or 5 days, that matters more than 5 degrees at night.
You don’t burn a whole day on a connection or a layover in Atlanta.
Fort Lauderdale and the Palm Beaches: Close Behind
Fort Lauderdale is Miami’s numbers with a calmer beach.
NOAA’s January average is 76°F by day and 61°F by night, practically identical.
The beach is long and wide, there’s a promenade, and it’s easier to find a hotel that isn’t a scene.
Keep going north and it cools off slowly.
The Palm Beaches are still nice in January, but every hour you drive up the coast takes a little off the nights.
By the time you get to the Space Coast, a January evening can be properly chilly.
One thing I like about this stretch is the Atlantic side generally stays warmer in winter than the Gulf side at the same latitude.
I went deeper on that in which side of Florida has warmer water, and the short version is the Gulf Stream runs close to this coast.
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Naples and Fort Myers: Beach Afternoons, Sweater Evenings
I’m not going to trash the Gulf coast.
Naples is beautiful in winter.
The sand is soft, the water is calm, the sunsets over the Gulf are the best in the state, and the pier is a nice walk at golden hour.
But be honest with yourself about what you want.
Naples averages 75°F in January and drops to 56°F at night.
Fort Myers is 75°F and 54°F. The Gulf there usually runs in the mid-60s in January, several degrees colder than the water off Key West.
Plenty of people swim in it.
Plenty more stand in it up to the knees and change their minds.
If your idea of a beach escape is reading in the sun at 2 p.m. and a sweater at dinner, it’s great, and it’s usually cheaper than the Keys.
If you want to be in the water every day, go further south.
One more Gulf-side thing.
In February the southwest coast warms faster than you’d expect.
NOAA puts Fort Myers at 78°F in February, higher than its January number by three degrees.
A late-February trip here is a much safer bet than an early-January one.
I compared the coasts month by month in is the east or west coast of Florida warmer in February.
Skip the Panhandle for a Beach Trip
Every winter someone tells me they’re doing “Florida” and they mean Pensacola or Destin.
Those beaches are gorgeous.
In July.
In January, Pensacola averages 63°F in the afternoon and 44°F at night.
That’s a jacket day and a heater night.
The water’s cold, the wind off the Gulf is real, and a lot of the beach places run on off-season hours.
It’s a fine, cheap winter getaway if you like empty sand and long walks.
It is not a swim trip.
That’s Pensacola Beach in the photo, under a cloudy evening sky, and it’s pretty typical for winter: white sand, gray water, nobody swimming.
Same goes, a bit less so, for Tampa, Clearwater and most of central Florida.
Warmer than home, sure.
But it’s not the beach week you’re picturing, so pack like it.
How I’d Book a Winter Beach Week
Here’s the plan I’d give a friend, in the order I’d do it.
Fly into Miami or Fort Lauderdale, even for the Keys. Flights straight into Key West’s little airport usually cost more and have fewer seats.
From Miami it’s about 160 miles down US-1 and around four hours without traffic.
That drive is half the fun.
The Overseas Highway runs right across the water for long stretches like the one in the photo, with the old bridge alongside.
You can take the bus, too, if you’d rather not pay to park a rental car on an island all week.
Book the room the day you book the flight. December through March is high season down here, the opposite of the rest of the country.
The good places in the Keys fill up and the prices go up with them.
Take a refundable rate if you can, so a cheaper deal later doesn’t hurt.
Watch the forecast for fronts, not highs. A week before you go, look at the overnight lows.
If a front is coming, plan the boat trip and the snorkeling for the days before it and the museums for the days after.
Pack one warm layer in the carry-on. A light fleece or a packable puffer.
You won’t need it most nights in Key West.
You’ll want it on the plane, at an outdoor dinner on the water, and on that one windy evening every trip seems to have.
Everything else fits in a carry-on: swimsuits, two pairs of shorts, sandals, and one pair of real shoes.
Pick the end of the season if you can. Late February and March give you the warmest water of the winter and, outside spring break weeks, a little less of the line at every restaurant.
Early January is the gamble.
It’s the coldest stretch of the year, and it’s where all the hoodie stories come from.
So if you want me to just pick: Key West if warm is the whole point, Marathon if you want it quieter, Miami or Fort Lauderdale if your trip is short.
Save Naples for late February, and save the Panhandle for summer.
