Water temperature in Grand Case

This data the coastal Grand Case sea water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current sea temperature in Grand Case

Water temperature in Grand Case today is 30.3°C. Based on our historical data over a period of ten years, the warmest water in this day in the Caribbean Sea near Grand Case was recorded in 2024 and was 30.5°C, and the coldest was recorded in 2011 at 28.5°C. Sea water temperature in Grand Case is expected to drop to 29.2°C in the next 10 days. September average water temperature in Grand Case is 29.1°C, the minimum temperature is 27.8°C, and the maximum is 30.8°C.

The swimming season in Grand Case lasts from January to December, twelve months per year! During those months, Grand Case water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Grand Case in winter reaches 26.8°C, in spring 26.9°C, in summer the average temperature rises to 28.5°C, and in autumn it is 28.9°C.

Grand Case water temperature now

The sea salinity in Grand Case is 36.45‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Grand Case for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Grand Case. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Grand Case. Data in table shown for 30 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Grand Case

Grand Case weather forecast

Current temperature and weather

Data in a table show Grand Case temperature today (30 September 2025). For more information and forecast for a few days, go to the weather forecast Grand Case.

0-3 h	3-6 h	6-9 h	9-12 h
28.8°C	28.9°C	28.9°C	28.7°C

12-15 h	15-18 h	18-21 h	21-24 h
29°C	29.1°C	29.1°C	29°C

Grand Case water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Grand Case. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Grand Case on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Grand Case

The nearest beaches and cities from Grand Case with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Orient Beach	30.3°C	29°C		0.87 m
Cul-de-Sac	30.3°C	29°C		0.87 m
Tintamarre Island	30.3°C	29°C		1.05 m
Anse Marcel	30.3°C	29°C		0.87 m
Sandy Ground	30.3°C	29°C		0.89 m
Mullet Bay	30.3°C	29°C		0.89 m
Sandy Ground	30.2°C	29°C		0.88 m
Rendezvous Bay	30.2°C	29°C		0.88 m
Meads Bay Beach	30.2°C	29°C		0.88 m
The Valley	30.2°C	29°C		0.88 m

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Our report for Grand Case is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.