So you're thinking about Key West in December? Smart move. I remember my first December trip down here – stepping off the plane into that perfect 75-degree air after leaving snow up north felt like cheating winter. But let's be real, Key West weather in December isn't perfect for everyone. If you hate sunshine and need guaranteed hot beach days, maybe try July instead. I'll give it to you straight based on my 10 winters living here – no fluff, just what actually matters.
What's Key West Weather Really Like in December?
Don't trust those generic "average temperature" stats. Here's the real deal:
| Weather Factor | Key West December Reality | Why It Matters |
|---|---|---|
| Daytime Highs | 75°F-80°F (24°C-27°C) | Perfect walking-around weather, but might feel cool if you want intense heat |
| Nighttime Lows | 65°F-70°F (18°C-21°C) | You'll want long sleeves at night, especially on boats |
| Rain | 2.5 inches average (only 7 rainy days) | Drought season! But when it rains, it POURS – I got soaked last year at Mallory Square |
| Ocean Temp | 76°F (24°C) | Refreshing for northerners, Floridians might find it chilly |
| Humidity | Around 70% | Dryest month – your hair won't frizz like in summer |
That Key West weather in December means you can actually enjoy outdoor activities without drowning in sweat. But pack smart – I’ve seen tourists shivering at sunset celebrations because they only brought tank tops.
Local tip: Always throw a light rain jacket in your day bag. December showers hit fast and hard – ruined my phone last year during an unexpected downpour near Duval Street.
Exactly What to Pack for December Weather in Key West
Forget generic packing lists. Here’s what you’ll actually use:
Clothing Essentials
- Short-sleeve tops (5-7): You'll live in these during the day
- Light sweater or fleece (1-2): Crucial for evenings – restaurants blast AC
- Rain shell (1): Compact waterproof layer that saved me countless times
- Comfortable walking shoes: Cobblestone streets murder cheap flip-flops
- Swimsuit: Hotels heat pools, but ocean feels brisk to some
Seriously, that light jacket isn't optional. I made that mistake year one – ended up buying an overpriced hoodie from a tourist trap that still smells like cheap dye.
Top Things to Do in Key West December Weather
December's weather makes these activities perfect:
| Activity | Why December Rocks | Local Details (+ Costs) |
|---|---|---|
| Sunset Celebration at Mallory Square | Cool evenings = comfortable crowds | Free entry, daily 2 hrs before sunset. Street performers work for tips ($1-5 per show recommended) |
| Snorkeling Dry Tortugas | Crystal-clear winter water visibility | Seaplane tours: $360-$450/person (Yankee Freedom ferry: $190). Bring windbreaker – that ride gets chilly |
| Duval Street Bar Crawl | No summer sweat-stickiness | Happy hour specials: 3-6pm. Avoid Sloppy Joe's between 7-9pm – total tourist trap chaos |
| Kayaking Mangroves | Lower humidity = fewer mosquitoes | Gecko's Island Adventures: $59/person, 2.5hr tours. Their 9am slot avoids afternoon winds |
The Key West weather in December means you can actually enjoy walking tours without wanting to die of heatstroke. Try the Hemingway Home tour (907 Whitehead St, $17 admission) early morning – cats sunbathe in the courtyard when it's cool.
December-Only Events You Can't Miss
- Christmas Boat Parade (Dec 15-20): Free viewing along Harborwalk. Get there by 5:30pm for front-row spots
- Key West Lighthouse Krampus Night (Dec 10): Bizarre European tradition meets tropics. $12 entry, 7-10pm – bring camera
- New Year's Eve Schooner Drop: Giant pirate schooner lowers at midnight. Avoid Duval Street if you hate crowds – I watched from Truman Waterfront Park instead
December Downsides (Nobody Tells You This)
Look, Key West weather in December has trade-offs:
- Crowds: Christmas week is madness. Waited 90 minutes for breakfast at Blue Heaven last year
- Prices: Hotels spike 40%+. Found a $350/night "budget" motel... that had bedbugs (avoid Seashell Motel)
- Water temps: If you dream of bathtub-warm ocean, come in June. My niece refused to swim last December
Book everything early. I mean now. Restaurants? Reservations open 30 days out – mark your calendar. That amazing table at Latitudes? Gone in minutes.
Key West December Weather vs Other Months
| Month | Avg Temp | Rain Days | Crowd Level | Best For |
|---|---|---|---|---|
| November | 78°F-82°F | 8 days | Medium | Warmer water, fewer people |
| December | 75°F-80°F | 7 days | High (peak) | Festive events, dry air |
| January | 74°F-78°F | 6 days | Medium-High | Similar weather, lower prices post-holidays |
See why Key West weather in December pulls people? That sweet spot between rainy season and brutal summer. But January might be smarter if you hate crowds.
Raw FAQ About Key West Weather in December
Does it ever get cold in Key West during December?
Cold is relative! Locals break out parkas at 65°F. But realistically, only about 3 nights per December dip below 60°F. I’ve only seen frost once in 10 years – freak weather event in 2010.
Can you swim in Key West in December?
Yes, but it’s not for everyone. Ocean temp hovers around 76°F. Northern visitors think it’s fine – my Canadian friends swim daily. Floridians? We might wear wetsuits. Hotel pools are heated though.
Is December hurricane season in Key West?
Officially no (season ends Nov 30). But I lived through off-season Tropical Storm Olga in Dec 2019. Flooded Duval Street knee-deep. Still extremely rare – travel insurance costs $50 and buys peace of mind.
What time does it get dark in Key West in December?
Between 5:30-6pm. Miss sunrise? It’s around 7am – perfect for jetlagged early risers. That makes Key West December weather ideal for maximizing daylight adventures.
Are mosquitoes bad in Key West during December?
Compared to summer? Heaven. But mangrove areas still have some. I pack picaridin lotion – smells better than DEET and works on no-see-ums (those tiny sand flies near beaches).
My Personal Key West December Survival Tips
After a decade of Key West weather in Decembers, here's my field guide:
- Rent bikes early: Best way to beat traffic. Bike Shop Key West charges $15/day – reserve online. Cheaper than parking nightmares
- Sunblock is non-negotiable: Winter sun burns faster than summer. Got my worst burn ever in December – UV reflection off water is brutal
- Fish for dinner specials: Avoid $40 entrées. Santiago's (213 Petronia St) does $12 fish tacos 3-5pm. Better than tourist traps
- Know the "weather windows": Mornings = calmest seas for boats. Afternoons get breezy – great for windsurfing, bad for hangovers
Bottom line? December brings the most comfortable Key West weather all year... if you prepare right. Forget those "paradise" brochures showing empty beaches – it's crowded and pricey. But sipping rum runner while watching the sunset in 75-degree perfection? Yeah, that part's real.