Average monthly water temperature in Grand Case, Saint Martin
On this page you find the mean water temperature over the year in Grand Case (), Saint Martin. Discover when the water is at its warmest and coolest, perfect for planning your visit.
In Grand Case, water temperatures are consistently warm throughout the year. The warmest month is September, with an average water temperature of 29°C (84°F).
The coolest month is January, with an average temperature of 26°C (79°F). This makes Grand Case a year-round destination for swimming and other water-based activities.
Grand Case Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grand Case - and find the best time to visit.
Grand Case 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Grand Case climate overview or explore weather in Saint Martin.
Popular this month
Where to go in August - average daytime high across popular destinations.
Baie Longue
30°C (86°F) Cul de Sac30°C (86°F) Marigot30°C (86°F) Grand Case30°C (86°F) Orient Bay French St Martin30°C (86°F) Les Terres Basses30°C (86°F) Baie Nettle30°C (86°F) Orient Bay30°C (86°F) 
