The month in detail
What to expect in December
Even in winter, Key West enjoys 24°C. A real asset for escaping the European cold. Rain risk remains low (14% of days), leaving good room for outdoor activities. A good balance between weather and crowds, even if April (9.1/10) remains theoretically better.
December ranks 6 out of 12 months in Key West. Compared to November: −2°C daytime.
This month's conditions
What it's like in December
UV index
5 · moderate
protect during midday hours
Feels like
muggy at times
19°
Sea
25°C
pleasant for swimming
Daylight
10.5h of daylight
Air quality
good
AQI 36
Compare
Is December the right month?
The best month in Key West is April (9.1/10), 0.6 pt higher than December.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Key West
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Key West
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach holiday.
Country · USA
🗣️LanguageEnglish
💶CurrencyUS Dollar ($)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘExpensive · 4/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘStable
🔥Hottest monthJuly · 30°C
❄️Coolest monthJanuary · 23°C
🌧️Rainiest month ⓘSeptember · 38%
🏖️ Beach holiday
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
Explore
Other destinations in December
If December doesn't convince you for this destination, compare with others.
Location
Where is Key West ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
USATemperate oceanic climate with a 9.1 → 5.7 gap between best and worst month. 10 years of ERA5 data to choose by project.
24.56°N · 81.78°W
Questions
Frequently asked questions
What is the best time to visit Key West?
April is the best month with 26.0°C highs, 24.0°C lows, 10.8h of sunshine and 13.0% rainy days. The months of April & March offer comparable conditions.
How many hours of sunshine does Key West get in April?
Key West averages 10.8 sunshine hours per day in April. It is the sunniest month with a climate score of 8.8/10.
What is the rainiest month in Key West?
September is the most unfavourable month with September has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Key West in April?
In April, overnight lows reach 24.0°C, while afternoon highs average 26.0°C.
Is Key West good in winter?
In winter (December-February), Key West scores 8.0/10 on average — Decent period conditions for cultural visits.. The best month overall remains April with a score of 8.8/10.
When should you avoid Key West?
September is the most difficult month to visit Key West, with September has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Key West in December?
In December, the sea averages 25°C in Key West: pleasant for swimming. Swimming is pleasant without a wetsuit.
Do you need sun protection in Key West in December?
The average UV index reaches 5 in December in Key West (moderate), with about 10.5h of daylight. Protect during midday hours.