All data are in degrees Fahrenheit

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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

65.9

°F

September 16, 13:17

Trend:

stable

Yesterday:

65.2°F

Tomorrow:

65.6°F

Sunrise:

06:48

Sunset:

19:26

Day Length:

12 h. 38 min.

Cardiff in September

Minimum:

43.4°F

Average:

45.5°F

Maximum:

47.4°F

Sea water temperature in Cardiff today

As of now, in Cardiff, the water temperature is 65.9°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 2.0°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to fall 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 maximum temperature for this date. The maximum temperature recorded for this date was 67.0°F on 2023, while the historical minimum was 62.1°F on 2024.

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 maximum recorded over the past years. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 65.3°F, the minimum temperature may reach 64.8°F, and the maximum might stay at 65.8°F.

Daily water temperature in Cardiff

Date Current Year

actual* / forecast**

last year 10 years average
Sep 2 67.5°F 66.1°F 65.4°F
Sep 3 66.9°F 65.8°F 65.3°F
Sep 4 67.5°F 65.5°F 65.3°F
Sep 5 67.3°F 65.0°F 65.2°F
Sep 6 67.0°F 65.3°F 65.0°F
Sep 7 67.3°F 65.2°F 65.1°F
Sep 8 67.0°F 64.9°F 65.1°F
Sep 9 66.7°F 64.9°F 65.2°F
Sep 10 66.2°F 64.2°F 64.9°F
Sep 11 65.8°F 64.4°F 64.7°F
Sep 12 66.0°F 64.0°F 64.5°F
Sep 13 64.5°F 63.7°F 64.2°F
Sep 14 62.8°F 63.0°F 64.0°F
Sep 15 65.2°F 62.8°F 64.0°F
Sep 16 65.9°F 62.4°F 63.9°F
Sep 17 65.6°F 62.1°F 63.6°F
Sep 18 65.8°F 62.1°F 63.8°F
Sep 19 65.5°F 61.9°F 63.5°F
Sep 20 65.3°F 62.9°F 63.3°F
Sep 21 65.1°F 62.2°F 63.1°F
Sep 22 64.8°F 61.3°F 62.7°F
Sep 23 64.8°F 61.1°F 62.8°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, 2026, reaching a 71.5°F. While the coldest temperature occurred on March 4, 2018, dipping to 39.0°F. The average readings by season are 45.6°F in Winter, 50.2°F in Spring, 64.7°F in Summer, and 58.3°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Barry 66.0°F 7mi
Newport 65.6°F 11mi
Bristol 64.6°F 25mi
Swansea 65.3°F 34mi

* current water temperature in this city

** straight line distance from Cardiff