What is the current water temperature in Belfast?

Q: What is the current water temperature in Belfast?

As of now, in Belfast, the water temperature is 4.78°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.

United States > Belfast

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.

40.6

°F

April 14, 02:36

Trend:

increasing

Yesterday:

40.2°F

Tomorrow:

41.4°F

Sunrise:

05:54

Sunset:

19:19

Day Length:

13 h. 25 min.

Belfast in April

Minimum:

36.6°F

Average:

40.3°F

Maximum:

43.6°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 40.6°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. 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

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming 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 45.0°F on 2021, while the historical minimum was 37.3°F on 2019.

latest data

last year

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 minimum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 41.8°F, with minimum temperature starting at 41.4°F, while the maximum might reach 42.0°F.

Daily water temperature in Belfast

Date	Current Year actual* / forecast**	last year	10 years average
Mar 31	36.0°F	37.0°F	37.7°F
Apr 1	36.0°F	37.5°F	37.7°F
Apr 2	35.9°F	37.5°F	38.0°F
Apr 3	37.4°F	36.7°F	38.0°F
Apr 4	36.4°F	36.6°F	37.9°F
Apr 5	38.3°F	38.1°F	38.4°F
Apr 6	37.3°F	38.1°F	38.4°F
Apr 7	38.8°F	38.1°F	38.8°F
Apr 8	37.0°F	38.2°F	38.9°F
Apr 9	38.6°F	38.2°F	39.1°F
Apr 10	39.4°F	38.0°F	39.3°F
Apr 11	39.7°F	38.0°F	39.5°F
Apr 12	41.1°F	37.7°F	39.8°F
Apr 13	40.2°F	38.0°F	40.3°F
Apr 14	40.6°F	38.1°F	40.7°F
Apr 15	41.4°F	38.5°F	41.5°F
Apr 16	41.8°F	38.7°F	41.9°F
Apr 17	41.7°F	38.9°F	41.9°F
Apr 18	41.9°F	40.2°F	42.1°F
Apr 19	41.8°F	40.2°F	41.9°F
Apr 20	41.8°F	38.5°F	42.0°F
Apr 21	42.0°F	39.7°F	42.2°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 July 30, 2023, reaching a 71.2°F. While the coldest temperature occurred on February 26, 2025, dipping to 32.2°F. The average readings by season are 39.6°F in Winter, 41.9°F in Spring, 60.8°F in Summer, and 55.8°F in Autumn.