Visit the Rainbow Mountains
The Rainbow Mountain (Vinicunca) is acolored rainbow mountain that will steal your heart forever and the view from the top will take your breath away.
With daytime temperatures of 27°C (81°F) and nighttime lows of 25°C (77°F), April in Koolbaai brings high temperatures during the day. The excellent weather makes it an appealing time to visit.
If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April, May, June, July and December typically offer the best circumstances for Koolbaai.
Pick a month to see the average temperature, rainfall and sunshine in Koolbaai - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Koolbaai typically stay consistent throughout April, with daily highs averaging around 27°C (81°F). Nights are warm, with lows around 25°C (77°F).
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.
Based on 48 years of weather observations in Koolbaai between 1978 and 2026, these are the recorded extremes.
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 April →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Warm weather calls for comfortable, breathable clothing in April. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Rain is likely on several days, so bring a good rain jacket. With water temperatures around 26°C (79°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Koolbaai climate overview or explore weather in Sint Maarten.
Where to go in April - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
Visit the Rainbow Mountains
The Rainbow Mountain (Vinicunca) is acolored rainbow mountain that will steal your heart forever and the view from the top will take your breath away.
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