Mystic Island water temp
This data the coastal Mystic Island ocean 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 ocean temperature in Mystic Island
Water temperature in Mystic Island today is 71.6°F. Based on our historical data over a period of ten years, the warmest water in this day in Mystic Island was recorded in 2018 and was 74.3°F, and the coldest was recorded in 2009 at 68.4°F. Sea water temperature in Mystic Island is expected to drop to 69.6°F in the next 10 days. September average water temperature in Mystic Island is 72.3°F, the minimum temperature is 66.6°F, and the maximum is 80.4°F.
The swimming season in Mystic Island lasts from June to September. During those months, Mystic Island water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Mystic Island in winter reaches 42.4°F, in spring 50°F, in summer the average temperature rises to 73.4°F, and in autumn it is 64°F.
Mystic Island water temperature now
| September 17, 2025 |
|---|
| today temp |
| 71.6°F |
| September 16, 2025 |
|---|
| yesterday temp |
| 72°F |
The ocean salinity in Mystic Island is 29.78‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Mystic 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 Mystic 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 Mystic Island. Data in table shown for September 17, 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 |
|---|---|---|---|
| 7' 1" | 6' 11" | 6' 7" | 6' 1" |
| 2.17 m | 2.11 m | 2 m | 1.85 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 5' 1" | 4' 6" | 4' 1" | 3' 9" |
| 1.56 m | 1.37 m | 1.24 m | 1.14 m |
Surf report in Mystic Island
Mystic Island weather forecast
Current temperature and weather
Data in a table show Mystic Island temperature today (September 17, 2025). For more information and forecast for a few days, go to the weather forecast Mystic Island.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | | |
| 68.5°F | 69.3°F | 69.8°F | 70.5°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  | |  |
| 71.6°F | 72.1°F | 71.6°F | 70.9°F |
You may also be interested in other sections of our site for Mystic Island: Sunrise and Sunset, Tides
Mystic Island water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Mystic 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 Mystic 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 | 41.4°F | 33.3°F | 49.8°F | cold |
| Ocean water temperature in Mystic Island in January | ||||
| February | 39.6°F | 32.5°F | 45.5°F | cold |
| Ocean water temperature in Mystic Island in February | ||||
| March | 42.6°F | 33.3°F | 51.3°F | cold |
| Ocean water temperature in Mystic Island in March | ||||
| April | 49.3°F | 40.8°F | 61.2°F | cold |
| Ocean water temperature in Mystic Island in April | ||||
| May | 57.9°F | 48.9°F | 70.2°F | cold |
| Ocean water temperature in Mystic Island in May | ||||
| June | 68.5°F | 59.5°F | 78.6°F | warm |
| Ocean water temperature in Mystic Island in June | ||||
| July | 75.7°F | 67.6°F | 84°F | warm |
| Ocean water temperature in Mystic Island in July | ||||
| August | 76.1°F | 70°F | 82°F | warm |
| Ocean water temperature in Mystic Island in August | ||||
| September | 72.3°F | 66.6°F | 80.4°F | warm |
| Ocean water temperature in Mystic Island in September | ||||
| October | 64.8°F | 57.2°F | 73.4°F | cold |
| Ocean water temperature in Mystic Island in October | ||||
| November | 55°F | 45.7°F | 63.3°F | cold |
| Ocean water temperature in Mystic Island in November | ||||
| December | 46.6°F | 35.2°F | 53.4°F | cold |
| Ocean water temperature in Mystic Island in December | ||||
Chart monthly average water temperature in Mystic Island
