San Clemente Island water temp
This data the coastal San Clemente 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 San Clemente Island
Water temperature in San Clemente Island today is 70°F. Based on our historical data over a period of ten years, the warmest water in this day in San Clemente Island was recorded in 2015 and was 72.9°F, and the coldest was recorded in 2010 at 64.8°F. Sea water temperature in San Clemente Island is expected to drop to 68°F in the next 10 days. September average water temperature in San Clemente Island is 69.4°F, the minimum temperature is 64°F, and the maximum is 74.7°F.
The swimming season in San Clemente Island lasts from July to October. During those months, San Clemente Island water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in San Clemente Island in winter reaches 59.7°F, in spring 60.6°F, in summer the average temperature rises to 66.7°F, and in autumn it is 67.1°F.
San Clemente Island water temperature now
| September 26, 2025 |
|---|
| today temp |
| 70°F |
| September 25, 2025 |
|---|
| yesterday temp |
| 70.5°F |
The ocean salinity in San Clemente Island is 33.16‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in San Clemente 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 San Clemente 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 San Clemente Island. Data in table shown for September 26, 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' 3" | 3' 5" | 3' 7" | 3' 10" |
| 0.99 m | 1.04 m | 1.09 m | 1.17 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 4' 0" | 4' 0" | 3' 10" | 3' 7" |
| 1.23 m | 1.23 m | 1.18 m | 1.1 m |
Surf report in San Clemente Island
San Clemente Island weather forecast
Current temperature and weather
Data in a table show San Clemente Island temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast San Clemente Island.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  | | |
| 63.1°F | 62.1°F | 61.9°F | 63°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 | |  | |
| 63.1°F | 63.9°F | 64°F | 67.5°F |
You may also be interested in other sections of our site for San Clemente Island: Sunrise and Sunset, Tides
San Clemente Island water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in San Clemente 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 San Clemente 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
Chart monthly average water temperature in San Clemente Island
