Koolbaai Weather in December
Koolbaai in December sees high temperatures, with highs around 28°C (82°F) and overnight lows of 25°C (77°F). Overall excellent conditions make it one of the better months to visit.
Rainfall in Koolbaai in December
Historically, the month has about 20 days of rain, averaging 60 mm (2.4 in) in total. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.
Temperature in Koolbaai in December
Koolbaai in December has excellent weather. Days reach 28°C (82°F) and nights cool to 25°C (77°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With lows around 25°C (77°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Koolbaai in December
There are approximately 248 hours of sunshine this month, resulting in mostly clear days.
Wind Speed in Koolbaai in December
December has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.
Average water temperature in December
The water temperature is 27°C (81°F), which most people find very comfortable. A good month for swimming and water sports.If you favor pleasant temperatures and minimal rainfall, December is one of the best months to visit Koolbaai.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sint Maarten, check out our Koolbaai's climate page.
Koolbaai Temperature in December
Min Temperature
25°C (77°F)
Max Temperature
28°C (82°F)
Water Temperature
27°C (81°F) *
Chance of Rain
67%
Precipitation
60 mm (2.4 in)
Rainy days
20 days
Humidity
77% *
Windspeed
5 m/s (10 knots) *
Sunshine
248 hours *
Percentage Sunshine
71% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Koolbaai typically stay consistent throughout December, with daily highs averaging around 28°C (82°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in December
Historical weather for Koolbaai in December
Browse day-by-day weather records for Koolbaai spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Koolbaai historical weather extremes in December
The extremes listed below come from historical weather data collected in Koolbaai from 1976 through 2025.
- The hottest December day on record in Koolbaai reached 32°C (90°F) (December 1, 1999).
- On December 2, 2005, Koolbaai saw its coldest December day with temperatures maxing out at 25°C (77°F).
- The lowest overnight temperature recorded in December was 19°C (66°F) (December 3, 2011).
Best Places in Sint Maarten in December
Find out more about the weather in Sint Maarten and which places have the best travel conditions in this month. See all of Sint Maarten in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Koolbaai in December
Warm temperatures in December make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Rain gear is recommended, you can expect wet weather on multiple days. The water temperature sits at about 27°C (81°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Koolbaai in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sint Maarten, check out our Koolbaai's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Koolbaai climate overview or explore weather in Sint Maarten.
