All data are in degrees Fahrenheit


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



July 14, 05:40











Day Length:

16 h. 45 min.

Belfast in July







Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 57.0°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 0.3°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 stay about the same.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. 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 60.5°F on 2021, while the historical minimum was 54.2°F on 2015.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 57.3°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
Jun 30 56.1°F 58.3°F 55.6°F
Jul 1 55.8°F 57.8°F 55.5°F
Jul 2 55.8°F 57.4°F 55.4°F
Jul 3 55.7°F 57.1°F 55.3°F
Jul 4 56.0°F 57.7°F 55.4°F
Jul 5 56.3°F 57.4°F 55.4°F
Jul 6 56.2°F 57.5°F 55.4°F
Jul 7 56.4°F 57.4°F 55.7°F
Jul 8 56.2°F 58.2°F 55.8°F
Jul 9 56.1°F 58.7°F 56.0°F
Jul 10 56.0°F 58.7°F 56.2°F
Jul 11 55.9°F 58.8°F 56.4°F
Jul 12 56.6°F 58.7°F 56.4°F
Jul 13 56.9°F 58.9°F 56.6°F
Jul 14 57.0°F 58.7°F 56.7°F
Jul 15 57.1°F 58.4°F 56.9°F
Jul 16 57.1°F 58.2°F 56.9°F
Jul 17 57.3°F 58.8°F 57.0°F
Jul 18 57.2°F 58.7°F 56.9°F
Jul 19 57.4°F 58.7°F 57.2°F
Jul 20 57.5°F 58.8°F 57.2°F
Jul 21 57.4°F 58.6°F 57.2°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.

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 August 14, 2022, reaching a 62.9°F. While the coldest temperature occurred on January 9, 2021, dipping to 42.4°F. The average readings by season are 47.8°F in Winter, 47.6°F in Spring, 56.3°F in Summer, and 55.8°F in Autumn.