Cardiff (CA) water temp
This data the coastal Cardiff 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 Cardiff
Water temperature in Cardiff today is 68°F. Based on our historical data over a period of ten years, the warmest water in this day in Cardiff was recorded in 2015 and was 75.4°F, and the coldest was recorded in 2024 at 63.3°F. Sea water temperature in Cardiff is expected to be constant 68°F in the next 10 days. September average water temperature in Cardiff is 70.2°F, the minimum temperature is 61.7°F, and the maximum is 77.9°F.
The swimming season in Cardiff lasts from June to October. During those months, Cardiff water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Cardiff in winter reaches 59.5°F, in spring 61.5°F, in summer the average temperature rises to 69.3°F, and in autumn it is 66.9°F.
Cardiff water temperature now
| September 26, 2025 |
|---|
| today temp |
| 68°F |
| September 25, 2025 |
|---|
| yesterday temp |
| 67.5°F |
The ocean salinity in Cardiff is 32.84‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Cardiff 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 Cardiff. 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 Cardiff. 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 |
|---|---|---|---|
| 2' 7" | 2' 7" | 2' 7" | 2' 7" |
| 0.78 m | 0.8 m | 0.79 m | 0.78 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 2' 8" | 2' 9" | 2' 9" | 2' 9" |
| 0.81 m | 0.85 m | 0.85 m | 0.85 m |
Surf report in Cardiff
Cardiff weather forecast
Current temperature and weather
Data in a table show Cardiff temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Cardiff.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | | |
| 66.6°F | 66.6°F | 66°F | 66.7°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  | | |
| 67.1°F | 68°F | 66.6°F | 65.1°F |
You may also be interested in other sections of our site for Cardiff: Sunrise and Sunset, Tides
Cardiff water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Cardiff. 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 Cardiff 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 | 59°F | 55.6°F | 62.1°F | cold |
| Ocean water temperature in Cardiff in January | ||||
| February | 59°F | 55.4°F | 63.3°F | cold |
| Ocean water temperature in Cardiff in February | ||||
| March | 59.5°F | 55.6°F | 66.4°F | cold |
| Ocean water temperature in Cardiff in March | ||||
| April | 61°F | 55°F | 68.4°F | cold |
| Ocean water temperature in Cardiff in April | ||||
| May | 64.2°F | 58.1°F | 70.5°F | cold |
| Ocean water temperature in Cardiff in May | ||||
| June | 66.6°F | 60.6°F | 72.5°F | cold |
| Ocean water temperature in Cardiff in June | ||||
| July | 70.3°F | 62.6°F | 77°F | warm |
| Ocean water temperature in Cardiff in July | ||||
| August | 70.9°F | 61°F | 78.4°F | warm |
| Ocean water temperature in Cardiff in August | ||||
| September | 70.2°F | 61.7°F | 77.9°F | warm |
| Ocean water temperature in Cardiff in September | ||||
| October | 67.3°F | 60.6°F | 73.8°F | cold |
| Ocean water temperature in Cardiff in October | ||||
| November | 63.5°F | 57.2°F | 70.7°F | cold |
| Ocean water temperature in Cardiff in November | ||||
| December | 60.6°F | 55.9°F | 65.5°F | cold |
| Ocean water temperature in Cardiff in December | ||||
Chart monthly average water temperature in Cardiff
