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

45.3

°F

January 1, 09:25

Trend:

stable

Yesterday:

45.6°F

Tomorrow:

45.3°F

Sunrise:

08:18

Sunset:

16:14

Day Length:

7 h. 56 min.

Cardiff in January

Minimum:

45.0°F

Average:

46.7°F

Maximum:

49.6°F

Sea water temperature in Cardiff today

As of now, in Cardiff, the water temperature is 45.3°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 1.4°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 stay about the same.

Recent sea temperature and forecast

Today's water temperature is considerably 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 49.6°F on 2016, while the historical minimum was 45.0°F on 2023.

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 histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 44.7°F, the minimum temperature may reach 44.2°F, and the maximum might stay at 45.3°F.

Daily water temperature in Cardiff

Date Current Year

actual* / forecast**

last year 10 years average
Jan 1 45.3°F 45.8°F 46.7°F
Jan 2 45.3°F 46.8°F 46.7°F
Jan 3 45.2°F 46.2°F 46.6°F
Jan 4 45.0°F 45.7°F 46.4°F
Jan 5 44.3°F 44.7°F 45.7°F
Jan 6 44.3°F 44.9°F 45.7°F
Jan 7 44.2°F 45.5°F 45.6°F
Jan 8 44.2°F 45.4°F 45.6°F
Dec 18 48.5°F 46.9°F 46.7°F
Dec 19 48.5°F 46.3°F 46.8°F
Dec 20 48.5°F 47.4°F 47.1°F
Dec 21 48.4°F 47.1°F 46.9°F
Dec 22 47.8°F 46.8°F 46.7°F
Dec 23 47.7°F 47.1°F 46.9°F
Dec 24 47.7°F 47.3°F 46.7°F
Dec 25 47.4°F 47.2°F 46.7°F
Dec 26 47.5°F 46.9°F 46.8°F
Dec 27 46.0°F 45.8°F 46.5°F
Dec 28 46.3°F 45.7°F 46.5°F
Dec 29 46.3°F 45.7°F 46.5°F
Dec 30 45.8°F 43.0°F 46.1°F
Dec 31 45.6°F 45.7°F 46.3°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 45.6°F in Winter, 50.1°F in Spring, 64.5°F in Summer, and 58.3°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Barry 46.4°F 7mi
Newport 44.1°F 11mi
Bristol 43.3°F 25mi
Swansea 46.8°F 34mi

* current water temperature in this city

** straight line distance from Cardiff