Water temperature in Cardiff
55.4
°F
May 21, 00:20
Trend:
increasingYesterday:
55.0°FTomorrow:
55.7°F
Sunrise:
Sunset:
Day Length:
15 h. 53 min.Cardiff in May
Minimum:
43.6°FAverage:
45.5°FMaximum:
47.2°FSea water temperature in Cardiff today
As of now, in Cardiff, the water temperature is 55.4°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. 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 rise a bit.Recent sea temperature and forecast
The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 58.9°F on 2025, while the historical minimum was 55.0°F on 2021.
Daily water temperature in Cardiff
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| May 7 | 54.9°F | 55.3°F | 53.1°F |
| May 8 | 54.7°F | 55.0°F | 53.2°F |
| May 9 | 54.5°F | 55.8°F | 53.5°F |
| May 10 | 55.5°F | 56.1°F | 53.8°F |
| May 11 | 54.7°F | 56.2°F | 54.0°F |
| May 12 | 55.1°F | 56.2°F | 54.0°F |
| May 13 | 55.0°F | 57.1°F | 54.5°F |
| May 14 | 55.1°F | 57.4°F | 54.7°F |
| May 15 | 54.8°F | 57.8°F | 54.9°F |
| May 16 | 54.8°F | 57.9°F | 55.2°F |
| May 17 | 53.4°F | 58.1°F | 55.3°F |
| May 18 | 53.9°F | 58.7°F | 55.5°F |
| May 19 | 54.3°F | 58.8°F | 55.7°F |
| May 20 | 55.0°F | 59.0°F | 56.4°F |
| May 21 | 55.4°F | 58.9°F | 56.8°F |
| May 22 | 55.7°F | 59.9°F | 57.1°F |
| May 23 | 55.7°F | 59.1°F | 57.1°F |
| May 24 | 56.1°F | 59.2°F | 57.5°F |
| May 25 | 56.2°F | 59.4°F | 57.6°F |
| May 26 | 56.2°F | 59.8°F | 57.6°F |
| May 27 | 56.7°F | 59.9°F | 58.0°F |
| May 28 | 56.8°F | 59.9°F | 58.2°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.