Koolbaai Weather in August
August in Koolbaai sees daytime temperatures around 30°C (86°F) and lows of 27°C (81°F) at night. With around 97 mm (3.8 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Koolbaai in August
This month experiences about 19 days of rain according to historical data, averaging 97 mm (3.8 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Koolbaai in August
August in Koolbaai brings high temperatures, with highs of 30°C (86°F) and nights around 27°C (81°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 27°C (81°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably.
Sunshine in Koolbaai in August
Expect a lot of sunshine this month, with about 285 hours of sun. These sunny conditions add to the overall experience.
Wind Speed in Koolbaai in August
August 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 August
The water is 28°C (82°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.If you prefer enjoying temperate temperatures and rain-free days, January, February, March, April, May, June, July and December typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 August
Min Temperature
27°C (81°F)
Max Temperature
30°C (86°F)
Water Temperature
28°C (82°F) *
Chance of Rain
63%
Precipitation
97 mm (3.8 in)
Rainy days
19 days
Humidity
76% *
Windspeed
5 m/s (10 knots) *
Sunshine
285 hours *
Percentage Sunshine
69% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Koolbaai typically stay consistent throughout August, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 27°C (81°F).
Average temperatures in August
Historical weather for Koolbaai in August
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 August
Based on 46 years of weather observations (1979-2025), these are the most extreme conditions recorded in Koolbaai.
- The hottest August day on record in Koolbaai reached 37°C (99°F) (August 28, 1993).
- Koolbaai experienced its chilliest August day on August 20, 1983, reaching only 27°C (81°F).
- The coldest night in August in Koolbaai was on August 2, 2011, with a minimum of 18°C (64°F).
Best Places in Sint Maarten in August
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 August →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Koolbaai in August
Warm but pleasant conditions in Koolbaai in August. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. The water temperature sits at about 28°C (82°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Koolbaai in August
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.
