Koolbaai Weather in May
Koolbaai in May averages 28°C (82°F) during the day and 26°C (79°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Koolbaai in May
Historically, the month has about 15 days of rain, averaging 74 mm (2.9 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 May
May is a perfect month in Koolbaai, with 28°C (82°F) during the day and 26°C (79°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights are warm at 26°C (79°F). It's worth making sure your accommodation has decent ventilation or air conditioning.
Sunshine in Koolbaai in May
With approximately 250 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.
Wind Speed in Koolbaai in May
Average wind conditions reach 5 m/s (10 knots) in May. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.
Average water temperature in May
The water temperature is 27°C (81°F), which most people find very comfortable. A good month for swimming and water sports.If you're a fan of comfortable temperatures and drier conditions, May is a great time to visit.
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 May
Min Temperature
26°C (79°F)
Max Temperature
28°C (82°F)
Water Temperature
27°C (81°F) *
Chance of Rain
50%
Precipitation
74 mm (2.9 in)
Rainy days
15 days
Humidity
77% *
Windspeed
5 m/s (10 knots) *
Sunshine
250 hours *
Percentage Sunshine
65% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Koolbaai typically stay consistent throughout May, with daily highs averaging around 28°C (82°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in May
Historical weather for Koolbaai in May
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 May
The extremes listed below come from historical weather data collected in Koolbaai from 1981 through 2025.
- The hottest May day on record in Koolbaai reached 34°C (93°F) (May 9, 1993).
- On May 11, 1986, Koolbaai saw its coldest May day with temperatures maxing out at 25°C (77°F).
- Koolbaai registered its coldest May night on May 11, 1986, with temperatures dropping to 20°C (68°F).
Best Places in Sint Maarten in May
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 May →
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What to Wear in Koolbaai in May
Warm temperatures in May 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. Expect water temperatures of around 27°C (81°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Koolbaai in May
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.
