Water temperature in Harbour Island
This data the coastal Harbour 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.
Current sea temperature in Harbour Island
Water temperature in Harbour Island today is 85.5°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Harbour Island was recorded in 2021 and was 86.9°F, and the coldest was recorded in 2008 at 83.3°F. Sea water temperature in Harbour Island is expected to drop to 85.3°F in the next 10 days. September average water temperature in Harbour Island is 85.3°F, the minimum temperature is 82.2°F, and the maximum is 87.4°F.
The swimming season in Harbour Island lasts from January to December, twelve months per year! During those months, Harbour Island water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Harbour Island in winter reaches 76.1°F, in spring 77.5°F, in summer the average temperature rises to 84.6°F, and in autumn it is 82.8°F.
Harbour Island water temperature now
| September 5, 2025 |
|---|
| today temp |
| 85.5°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 85.6°F |
The sea salinity in Harbour Island is 36.91‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Harbour Island 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 Harbour 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 Harbour Island. Data in table shown for September 5, 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 |
|---|---|---|---|
| 2' 0" | 2' 0" | 1' 10" | 1' 9" |
| 0.61 m | 0.6 m | 0.56 m | 0.54 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 9" | 1' 9" | 1' 8" | 1' 7" |
| 0.53 m | 0.53 m | 0.52 m | 0.48 m |
Surf report in Harbour Island
Harbour Island weather forecast
Current temperature and weather
Data in a table show Harbour Island temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Harbour Island.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 79.7°F | 81.5°F | 81.5°F | 82°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  | |  |
| 82.6°F | 81°F | 81°F | 81.3°F |
You may also be interested in other sections of our site for Harbour Island: Sunrise and Sunset, Tides
Harbour Island water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Harbour 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 Harbour 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 | |
|---|---|---|---|---|
| January | 75.7°F | 72.1°F | 78.6°F | warm |
| Sea water temperature in Harbour Island in January | ||||
| February | 75.2°F | 71.8°F | 78.1°F | warm |
| Sea water temperature in Harbour Island in February | ||||
| March | 75.6°F | 70.9°F | 79.3°F | warm |
| Sea water temperature in Harbour Island in March | ||||
| April | 77.2°F | 73.2°F | 82.6°F | hot |
| Sea water temperature in Harbour Island in April | ||||
| May | 79.7°F | 75.4°F | 85.5°F | hot |
| Sea water temperature in Harbour Island in May | ||||
| June | 82.9°F | 77.9°F | 86.9°F | hot |
| Sea water temperature in Harbour Island in June | ||||
| July | 84.9°F | 82°F | 88.3°F | hot |
| Sea water temperature in Harbour Island in July | ||||
| August | 85.8°F | 83.1°F | 88.2°F | hot |
| Sea water temperature in Harbour Island in August | ||||
| September | 85.3°F | 82.2°F | 87.4°F | hot |
| Sea water temperature in Harbour Island in September | ||||
| October | 83.1°F | 77.9°F | 86.7°F | hot |
| Sea water temperature in Harbour Island in October | ||||
| November | 79.7°F | 75.9°F | 83.1°F | hot |
| Sea water temperature in Harbour Island in November | ||||
| December | 77.4°F | 74.3°F | 81.5°F | hot |
| Sea water temperature in Harbour Island in December | ||||
Chart monthly average water temperature in Harbour Island
