Grand Case Weather in May
May is one of the perfect months to visit Grand Case, with daytime temperatures of 28°C (82°F) and lows of 26°C (79°F) at night. Do note that quite a bit of rainfall is typical, averaging around 73 mm (2.9 in).
Rainfall in Grand Case in May
You can expect rain on roughly 15 days based on historical data, averaging 73 mm (2.9 in) for the month. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Grand Case in May
May is a good time to be in Grand Case. Days are perfect, reaching 28°C (82°F), with nights around 26°C (79°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows around 26°C (79°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Grand Case in May
Expect sunny days throughout the month, with an estimated 250 hours of sunshine. This makes it a pleasant time to visit Grand Case.
Wind Speed in Grand Case in May
May 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 May
The water temperature is 27°C (81°F), which most people find very comfortable. A good month for swimming and water sports.So this is a great month to visit if you prefer dry days with pleasant temperatures.
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 May
Min Temperature
26°C (79°F)
Max Temperature
28°C (82°F)
Water Temperature
27°C (81°F) *
Chance of Rain
50%
Precipitation
73 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 Grand Case 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 Grand Case in May
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 May
According to our 45 years of weather records for Grand Case, the following extremes were recorded between 1981 and 2026.
- The hottest May day on record in Grand Case reached 34°C (93°F) (May 9, 1993).
- On May 11, 1986, Grand Case saw its coldest May day with temperatures maxing out at 25°C (77°F).
- The lowest overnight temperature recorded in May was 20°C (68°F) (May 11, 1986).
Best Places in Saint Martin in May
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 May →
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What to Wear in Grand Case 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. The water temperature sits at about 27°C (81°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 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 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.
