Grand Case weather by month & the best time to visit
St. Martin · beach resort · semi-arid climate
The best time to visit Grand Case is February — its sunniest month (Sunshine Score 95/100), with March and January close behind. Grand Case averages about 3,131 hours of sunshine a year. Daytime highs around 26°C / 79°F and roughly 12 mm of rain in February.
When is the best time to visit Grand Case?
For sunshine, the best time to visit Grand Case is February, then March and January. The dullest month is October (78/100, 108 mm of rain). The full month-by-month picture is in the table below.
How sunny is Grand Case?
Grand Case is one of the sunniest places on Earth: about 3,131 hours of sunshine a year. February (95/100) is noticeably better than October (78). It is the only destination Sunshine Atlas tracks in St. Martin. Rain has a clear season: the wettest stretch, around October, carries about 45% of the annual 615 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 94 | 26° / 79°F | 25° / 77°F | 20 mm | 8 | 27° / 81°F |
| February | 95 | 26° / 79°F | 25° / 77°F | 12 mm | 9 | 27° / 81°F |
| March | 95 | 26° / 79°F | 25° / 77°F | 16 mm | 11 | 27° / 81°F |
| April | 93 | 27° / 81°F | 26° / 79°F | 26 mm | 11 | 28° / 82°F |
| May | 86 | 28° / 82°F | 27° / 81°F | 63 mm | 11 | 29° / 84°F |
| June | 90 | 28° / 82°F | 27° / 81°F | 42 mm | 10 | 30° / 86°F |
| July | 88 | 29° / 84°F | 28° / 82°F | 54 mm | 11 | 30° / 86°F |
| August | 86 | 29° / 84°F | 28° / 82°F | 66 mm | 11 | 30° / 86°F |
| September | 81 | 29° / 84°F | 28° / 82°F | 90 mm | 10 | 30° / 86°F |
| October | 78 | 29° / 84°F | 28° / 82°F | 108 mm | 9 | 31° / 88°F |
| November | 83 | 28° / 82°F | 27° / 81°F | 78 mm | 8 | 29° / 84°F |
| December | 90 | 27° / 81°F | 26° / 79°F | 40 mm | 7 | 28° / 82°F |
Sea temperature in Grand Case by month
The sea off Grand Case is warmest in October at around 31°C / 88°F, and coolest in January at 27°C / 81°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
.jpg/500px-Saba_Hell's_Gate_(cropped).jpg)
Grand Case: questions and answers
What kind of destination is Grand Case?
Grand Case is a beach resort in St. Martin with a semi-arid climate — the sea reaches 31°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does Grand Case get a year?
Grand Case gets about 3,131 hours of sunshine a year, at its best around February.
When is the best time to visit Grand Case?
The sunniest time to visit Grand Case is February, when the Sunshine Score peaks at 95/100 (with March and January close behind). Expect daytime highs around 26°C / 79°F.
What is the least sunny month in Grand Case?
October is the least sunny month in Grand Case, scoring 78/100 with about 108 mm of rain.
What is the sea temperature in Grand Case?
The sea in Grand Case ranges from about 27°C (January) to 31°C (October). Month-by-month sea temperatures are on this page.
How strong is the sun in Grand Case?
The typical midday UV index in Grand Case peaks around 11 (extreme) in March, easing to about 7 (high) in December. Month-by-month midday UV values are in the UV column of the table on this page.
Put the Grand Case sunshine badge on your site
A compact badge showing Grand Case's sunshine at a glance — free to embed under CC BY 4.0. Paste this wherever you'd like it to appear:
Live preview — this is exactly what your readers see: