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.
Thinking of visiting Koolbaai in June? Expect high temperatures reaching 29°C (84°F) during the day, dropping to 26°C (79°F) at night, and note that quite a bit of rainfall is likely.
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 June, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 26°C (79°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 weather observations in Koolbaai between 1979 and 2026, these are the recorded extremes during June.
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 June →
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 June. 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 27°C (81°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
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 June - 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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