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

62.1

°F

August 3, 21:31

Trend:

decreasing

Yesterday:

62.5°F

Tomorrow:

61.9°F

Sunrise:

05:37

Sunset:

21:22

Day Length:

15 h. 45 min.

Belfast in August

Minimum:

42.9°F

Average:

47.6°F

Maximum:

49.0°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 62.1°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 3.6°F higher 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 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 60.3°F on 2021, while the historical minimum was 56.0°F on 2017.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 61.8°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Belfast

Date Current Year

actual* / forecast**

last year 10 years average
Jul 20 63.1°F 61.0°F 58.5°F
Jul 21 63.2°F 60.6°F 58.4°F
Jul 22 62.6°F 60.2°F 58.3°F
Jul 23 62.9°F 59.8°F 58.3°F
Jul 24 62.5°F 59.5°F 58.4°F
Jul 25 62.8°F 59.2°F 58.4°F
Jul 26 61.7°F 58.9°F 58.5°F
Jul 27 61.9°F 58.6°F 58.6°F
Jul 28 61.5°F 59.0°F 58.7°F
Jul 29 61.3°F 58.9°F 58.7°F
Jul 30 61.8°F 58.8°F 58.7°F
Jul 31 62.3°F 58.8°F 58.7°F
Aug 1 62.1°F 59.0°F 58.8°F
Aug 2 62.5°F 58.8°F 58.8°F
Aug 3 62.1°F 58.7°F 58.5°F
Aug 4 61.9°F 58.6°F 58.3°F
Aug 5 62.0°F 59.2°F 58.4°F
Aug 6 61.9°F 59.2°F 58.3°F
Aug 7 61.9°F 59.1°F 58.2°F
Aug 8 61.8°F 59.5°F 58.2°F
Aug 9 61.6°F 59.2°F 57.9°F
Aug 10 61.4°F 59.1°F 57.8°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 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 July 15, 2026, reaching a 63.7°F. While the coldest temperature occurred on January 9, 2021, dipping to 42.4°F. The average readings by season are 47.7°F in Winter, 48.2°F in Spring, 57.1°F in Summer, and 55.8°F in Autumn.