This data the coastal Alphonse Island 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.
Water temperature in Alphonse Island today is 25.7°C. Based on our historical data over a period of ten years, the warmest water in this day in the Indian Ocean near Alphonse Island was recorded in 2015 and was 28°C, and the coldest was recorded in 2016 at 25.9°C. Sea water temperature in Alphonse Island is expected to rise to 27.1°C in the next 10 days. September average water temperature in Alphonse Island is 27°C, the minimum temperature is 25.4°C, and the maximum is 29°C.
The swimming season in Alphonse Island lasts from January to December, twelve months per year! During those months, Alphonse Island water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Alphonse Island in winter reaches 28.5°C, in spring 29.6°C, in summer the average temperature rises to 26.7°C, and in autumn it is 27.8°C.
7 September 2025 |
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today temp |
25.7°C |
6 September 2025 |
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yesterday temp |
25.8°C |
The sea salinity in Alphonse Island is 34.38‰, and the average salinity of the World Ocean is 35‰.
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 Alphonse Island. 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 Alphonse Island. Data in table shown for 8 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
3' 6" | 3' 5" | 3' 5" | 3' 7" |
1.06 m | 1.03 m | 1.04 m | 1.08 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
3' 6" | 3' 9" | 3' 11" | 4' 0" |
1.07 m | 1.14 m | 1.19 m | 1.23 m |
Data in a table show Alphonse Island temperature today (8 September 2025). For more information and forecast for a few days, go to the weather forecast Alphonse Island.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
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25.2°C | 25°C | 25.1°C | 25.1°C |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
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25.3°C | 25.4°C | 25.2°C | 25.2°C |
You may also be interested in other sections of our site for Alphonse Island: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly sea temperature in Alphonse Island. 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 Alphonse Island 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
Month | Avr | Min | Max | |
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January | 28.4°C | 26.6°C | 30.2°C | hot |
Sea water temperature in Alphonse Island in January | ||||
February | 28.8°C | 27.7°C | 30.4°C | hot |
Sea water temperature in Alphonse Island in February | ||||
March | 29.5°C | 27.9°C | 30.8°C | hot |
Sea water temperature in Alphonse Island in March | ||||
April | 30°C | 28.2°C | 31.2°C | hot |
Sea water temperature in Alphonse Island in April | ||||
May | 29.3°C | 27.6°C | 30.7°C | hot |
Sea water temperature in Alphonse Island in May | ||||
June | 27.6°C | 25.7°C | 29.6°C | hot |
Sea water temperature in Alphonse Island in June | ||||
July | 26.3°C | 24.5°C | 27.8°C | hot |
Sea water temperature in Alphonse Island in July | ||||
August | 26.3°C | 24.6°C | 28.6°C | hot |
Sea water temperature in Alphonse Island in August | ||||
September | 27°C | 25.4°C | 29°C | hot |
Sea water temperature in Alphonse Island in September | ||||
October | 27.9°C | 26.2°C | 29.8°C | hot |
Sea water temperature in Alphonse Island in October | ||||
November | 28.5°C | 26.6°C | 30.1°C | hot |
Sea water temperature in Alphonse Island in November | ||||
December | 28.4°C | 26.1°C | 30.1°C | hot |
Sea water temperature in Alphonse Island in December |