Siesta Key water temp
This data the coastal Siesta Key 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 Siesta Key
Water temperature in Siesta Key today is 86°F. Based on our historical data over a period of ten years, the warmest water in this day in the Gulf of Mexico near Siesta Key was recorded in 2007 and was 87.4°F, and the coldest was recorded in 2018 at 84.2°F. Sea water temperature in Siesta Key is expected to drop to 85.8°F in the next 10 days. September average water temperature in Siesta Key is 85.5°F, the minimum temperature is 81.9°F, and the maximum is 88.3°F.
The swimming season in Siesta Key lasts from February to December. During those months, Siesta Key water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Siesta Key in winter reaches 66.7°F, in spring 74.5°F, in summer the average temperature rises to 85.8°F, and in autumn it is 80.1°F.
Siesta Key water temperature now
| September 5, 2025 |
|---|
| today temp |
| 86°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 86°F |
The ocean salinity in Siesta Key is 36.33‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Siesta Key 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 Siesta Key. 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 Siesta Key. 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 |
|---|---|---|---|
| 0' 9" | 0' 9" | 0' 10" | 0' 10" |
| 0.22 m | 0.23 m | 0.25 m | 0.26 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 0' 11" | 0' 11" | 0' 10" | 0' 10" |
| 0.27 m | 0.27 m | 0.26 m | 0.26 m |
Surf report in Siesta Key
Siesta Key weather forecast
Current temperature and weather
Data in a table show Siesta Key temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Siesta Key.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | |  |  |
| 81.7°F | 80.6°F | 80.1°F | 80.4°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | |  |
| 84°F | 85.5°F | 84°F | 82°F |
You may also be interested in other sections of our site for Siesta Key: Sunrise and Sunset, Tides
Siesta Key water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Siesta Key. 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 Siesta Key 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 | 65.5°F | 55.8°F | 74.1°F | cold |
| Ocean water temperature in Siesta Key in January | ||||
| February | 66°F | 59.5°F | 74.5°F | cold |
| Ocean water temperature in Siesta Key in February | ||||
| March | 69.3°F | 58.8°F | 78.3°F | warm |
| Ocean water temperature in Siesta Key in March | ||||
| April | 74.7°F | 64.6°F | 80.8°F | warm |
| Ocean water temperature in Siesta Key in April | ||||
| May | 79.7°F | 73.9°F | 86.2°F | hot |
| Ocean water temperature in Siesta Key in May | ||||
| June | 84.2°F | 76.5°F | 87.8°F | hot |
| Ocean water temperature in Siesta Key in June | ||||
| July | 86.4°F | 83.5°F | 89.2°F | hot |
| Ocean water temperature in Siesta Key in July | ||||
| August | 86.9°F | 83.7°F | 91°F | hot |
| Ocean water temperature in Siesta Key in August | ||||
| September | 85.5°F | 81.9°F | 88.3°F | hot |
| Ocean water temperature in Siesta Key in September | ||||
| October | 80.8°F | 72.7°F | 87.1°F | hot |
| Ocean water temperature in Siesta Key in October | ||||
| November | 73.9°F | 67.8°F | 82.4°F | warm |
| Ocean water temperature in Siesta Key in November | ||||
| December | 68.9°F | 61.5°F | 74.8°F | warm |
| Ocean water temperature in Siesta Key in December | ||||
Chart monthly average water temperature in Siesta Key
