All data are in degrees Fahrenheit

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Water temperature in Belfast

Detailed information about the current water temperature in Belfast. 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 Belfast now

60.8

°F

April 4, 17:32

Trend:

decreasing

Yesterday:

60.9°F

Tomorrow:

60.5°F

Sunrise:

07:49

Sunset:

19:16

Day Length:

11 h. 27 min.

Belfast in April

Minimum:

60.2°F

Average:

62.5°F

Maximum:

64.2°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 60.8°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 about the same as 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 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 also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 62.7°F on 2025, while the historical minimum was 58.7°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 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 60.0°F, the minimum temperature may reach 59.5°F, and the maximum might stay at 60.5°F.

Daily water temperature in Belfast

Date Current Year

actual* / forecast**

last year 10 years average
Mar 21 60.3°F 63.4°F 61.9°F
Mar 22 60.7°F 63.2°F 61.6°F
Mar 23 61.4°F 62.7°F 61.6°F
Mar 24 62.0°F 62.4°F 61.5°F
Mar 25 61.9°F 62.0°F 61.3°F
Mar 26 62.1°F 62.9°F 61.3°F
Mar 27 61.6°F 62.9°F 61.2°F
Mar 28 61.7°F 62.5°F 61.1°F
Mar 29 61.7°F 62.8°F 60.9°F
Mar 30 61.3°F 62.3°F 60.9°F
Mar 31 60.7°F 62.2°F 61.0°F
Apr 1 60.3°F 61.9°F 60.8°F
Apr 2 60.4°F 61.9°F 61.0°F
Apr 3 60.9°F 61.7°F 60.9°F
Apr 4 60.8°F 62.7°F 60.8°F
Apr 5 60.5°F 62.1°F 60.5°F
Apr 6 60.4°F 61.8°F 60.4°F
Apr 7 60.3°F 62.0°F 60.3°F
Apr 8 59.9°F 61.9°F 59.9°F
Apr 9 59.7°F 61.3°F 59.7°F
Apr 10 59.7°F 60.6°F 59.7°F
Apr 11 59.5°F 59.7°F 59.5°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 Belfast by month

In an average year, Belfast offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Belfast was recorded on January 31, 2018, reaching a 69.7°F. While the coldest temperature occurred on August 14, 2022, dipping to 46.6°F. The average readings by season are 62.9°F in Winter, 59.0°F in Spring, 49.9°F in Summer, and 54.1°F in Autumn.