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 1.12°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.

34.0

°F

February 25, 13:04

Trend:

stable

Yesterday:

33.8°F

Tomorrow:

33.9°F

Sunrise:

06:21

Sunset:

17:18

Day Length:

10 h. 57 min.

Belfast in March

Minimum:

37.9°F

Average:

40.5°F

Maximum:

42.0°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 34.0°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 1.8°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 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 is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 37.9°F on 2023, while the historical minimum was 32.6°F on 2025.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest 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 33.8°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
Feb 11	33.3°F	34.2°F	36.1°F
Feb 12	33.5°F	34.3°F	36.2°F
Feb 13	33.2°F	33.7°F	36.1°F
Feb 14	33.4°F	34.1°F	36.1°F
Feb 15	33.5°F	34.1°F	35.9°F
Feb 16	33.2°F	33.9°F	35.7°F
Feb 17	33.5°F	34.1°F	35.8°F
Feb 18	33.3°F	34.2°F	35.8°F
Feb 19	33.8°F	33.9°F	35.8°F
Feb 20	34.0°F	33.6°F	35.6°F
Feb 21	33.8°F	33.2°F	35.5°F
Feb 22	34.2°F	33.3°F	35.6°F
Feb 23	33.7°F	33.4°F	35.7°F
Feb 24	33.8°F	33.2°F	35.6°F
Feb 25	34.0°F	32.6°F	35.8°F
Feb 26	33.9°F	32.2°F	35.7°F
Feb 27	34.3°F	34.4°F	36.1°F
Feb 28	34.1°F	33.4°F	35.9°F
Mar 1	33.7°F	34.8°F	36.2°F
Mar 2	33.5°F	34.6°F	35.9°F
Mar 3	33.4°F	33.9°F	35.9°F
Mar 4	33.4°F	33.8°F	35.8°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 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.