Grand Case Weather in August
August in Grand Case averages 30°C (86°F) during the day and 27°C (81°F) at night. Quite a bit of rainfall is typical this month, with around 97 mm (3.8 in) on average. An umbrella is a good idea.
Rainfall in Grand Case in August
Typically, about 19 days will experience rainfall, with an average of 97 mm (3.8 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Grand Case in August
In August, Grand Case gets high temperatures, with highs of 30°C (86°F). Nights cool to around 27°C (81°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 27°C (81°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.
Sunshine in Grand Case in August
Enjoy a sunny month with about 285 hours of sunshine, the clear skies make Grand Case even more beautiful.
Wind Speed in Grand Case 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 temperature is 28°C (82°F), which most people find very comfortable. A good month for swimming and water sports.If you prefer dry days with pleasant temperatures, 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 Saint Martin, check out our Grand Case's climate page.
Grand Case 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 Grand Case 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 Grand Case in August
Browse day-by-day weather records for Grand Case spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Grand Case historical weather extremes in August
According to our 46 years of weather records for Grand Case, the following extremes were recorded between 1979 and 2025.
- Grand Case recorded its highest August temperature of 37°C (99°F) on August 28, 1993.
- On August 20, 1983, Grand Case saw its coldest August day with temperatures maxing out at 27°C (81°F).
- Grand Case registered its coldest August night on August 2, 2011, with temperatures dropping to 18°C (64°F).
Best Places in Saint Martin in August
Find out more about the weather in Saint Martin and which places have the best travel conditions in this month. See all of Saint Martin in August →
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What to Wear in Grand Case in August
Warm temperatures in August 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. Prepare for significant rainfall with proper waterproof clothing and shoes. 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Grand Case 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 Saint Martin, check out our Grand Case's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Grand Case climate overview or explore weather in Saint Martin.
