All data are in degrees Fahrenheit


Water temperature in Cardiff

Detailed information about the current water temperature in Cardiff. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Cardiff now



July 14, 05:05











Day Length:

16 h. 11 min.

Cardiff in July







Sea water temperature in Cardiff today

As of now, in Cardiff, the water temperature is 62.9°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 2.4°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 69.4°F on 2018, while the historical minimum was 63.3°F on 2020.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the minimum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 63.6°F, with minimum temperature starting at 63.1°F, while the maximum might reach 63.9°F.

Daily water temperature in Cardiff

Date Current Year

actual* / forecast**

last year 10 years average
Jun 30 63.9°F 66.0°F 63.5°F
Jul 1 63.2°F 65.4°F 63.4°F
Jul 2 63.5°F 65.5°F 63.5°F
Jul 3 63.5°F 65.2°F 63.5°F
Jul 4 63.5°F 65.0°F 63.7°F
Jul 5 63.4°F 64.7°F 63.5°F
Jul 6 63.3°F 64.6°F 63.9°F
Jul 7 63.2°F 64.5°F 64.2°F
Jul 8 63.1°F 65.1°F 64.2°F
Jul 9 63.1°F 65.0°F 64.3°F
Jul 10 63.1°F 64.8°F 64.5°F
Jul 11 63.2°F 65.4°F 64.7°F
Jul 12 63.1°F 65.0°F 64.8°F
Jul 13 62.8°F 65.2°F 65.2°F
Jul 14 62.9°F 64.8°F 65.2°F
Jul 15 63.1°F 65.1°F 65.5°F
Jul 16 63.2°F 64.6°F 65.6°F
Jul 17 63.6°F 64.8°F 65.9°F
Jul 18 63.8°F 65.0°F 66.2°F
Jul 19 63.7°F 64.4°F 66.1°F
Jul 20 63.9°F 64.5°F 66.3°F
Jul 21 63.9°F 64.4°F 66.3°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Cardiff by month

In an average year, Cardiff offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Cardiff was recorded on August 15, 2022, reaching a 70.0°F. While the coldest temperature occurred on March 4, 2018, dipping to 39.0°F. The average readings by season are 45.8°F in Winter, 49.9°F in Spring, 64.1°F in Summer, and 58.4°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Barry 63.1°F 7mi
Newport 62.3°F 11mi
Bristol 63.9°F 25mi
Swansea 62.1°F 34mi

* current water temperature in this city

** straight line distance from Cardiff