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 2.88°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.

37.2

°F

January 16, 05:34

Trend:

decreasing

Yesterday:

37.2°F

Tomorrow:

37.0°F

Sunrise:

07:09

Sunset:

16:24

Day Length:

9 h. 15 min.

Belfast in January

Minimum:

38.4°F

Average:

40.6°F

Maximum:

42.5°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 37.2°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. 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

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 40.2°F on 2022, while the historical minimum was 36.8°F on 2018.

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. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 36.5°F, the minimum temperature may reach 36.2°F, and the maximum might stay at 37.0°F.

Daily water temperature in Belfast

Date	Current Year actual* / forecast**	last year	10 years average
Jan 2	38.6°F	40.7°F	40.8°F
Jan 3	37.9°F	40.8°F	40.5°F
Jan 4	36.6°F	39.5°F	40.3°F
Jan 5	36.8°F	39.9°F	40.3°F
Jan 6	36.6°F	39.8°F	40.1°F
Jan 7	36.6°F	39.8°F	40.1°F
Jan 8	36.9°F	39.6°F	40.0°F
Jan 9	37.0°F	39.1°F	40.0°F
Jan 10	36.3°F	39.1°F	39.9°F
Jan 11	37.0°F	40.0°F	39.8°F
Jan 12	37.1°F	39.8°F	39.8°F
Jan 13	36.7°F	39.5°F	39.5°F
Jan 14	37.2°F	39.2°F	39.5°F
Jan 15	37.2°F	38.9°F	39.1°F
Jan 16	37.2°F	38.1°F	39.0°F
Jan 17	37.0°F	38.1°F	38.8°F
Jan 18	36.8°F	36.9°F	38.6°F
Jan 19	36.6°F	36.6°F	38.4°F
Jan 20	36.5°F	37.9°F	38.3°F
Jan 21	36.3°F	37.5°F	38.1°F
Jan 22	36.2°F	36.6°F	38.0°F
Jan 23	36.3°F	36.9°F	38.1°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 39.7°F in Winter, 41.9°F in Spring, 60.8°F in Summer, and 55.8°F in Autumn.