Grand Case Weather in December
Grand Case in December sees high temperatures, with highs around 28°C (82°F) and overnight lows of 25°C (77°F). Rainfall is fairly high at around 60 mm (2.4 in) on average, so pack waterproofs just in case.
Rainfall in Grand Case in December
Typically around 20 days of rainfall are expected, averaging 60 mm (2.4 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 December
The temperature in Grand Case in December is perfect. Daytime highs reach 28°C (82°F), with nights dropping to 25°C (77°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows around 25°C (77°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Grand Case in December
With approximately 248 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.
Wind Speed in Grand Case in December
Average wind conditions reach 5 m/s (10 knots) in December. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.
Average water temperature in December
The water is 27°C (81°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.If you're inclined towards comfortable temperatures and drier conditions, December is a good time to visit Grand Case.
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 December
Min Temperature
25°C (77°F)
Max Temperature
28°C (82°F)
Water Temperature
27°C (81°F) *
Chance of Rain
67%
Precipitation
60 mm (2.4 in)
Rainy days
20 days
Humidity
77% *
Windspeed
5 m/s (10 knots) *
Sunshine
248 hours *
Percentage Sunshine
71% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Grand Case typically stay consistent throughout December, with daily highs averaging around 28°C (82°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in December
Historical weather for Grand Case in December
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 December
Our historical data for Grand Case spans 1976 to 2025, revealing these weather extremes.
- The warmest day in December was on December 1, 1999, with a maximum of 32°C (90°F).
- Grand Case experienced its chilliest December day on December 2, 2005, reaching only 25°C (77°F).
- Nighttime temperatures dropped to 18°C (64°F) on December 3, 2011, marking the coldest December night on record.
Best Places in Saint Martin in December
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 December →
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What to Wear in Grand Case in December
Warm but pleasant conditions in Grand Case in December. 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. Wet weather is likely, so pack waterproof gear for multiple rainy days. Expect water temperatures of around 27°C (81°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Grand Case in December
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.
