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 16.0°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

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.

60.8

°F

September 4, 14:38

Trend:

stable

Yesterday:

63.3°F

Tomorrow:

60.9°F

Sunrise:

06:02

Sunset:

19:08

Day Length:

13 h. 6 min.

Belfast in September

Minimum:

37.0°F

Average:

40.0°F

Maximum:

42.7°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 60.8°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 0.8°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 stay about the same.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling 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 64.6°F on 2018, while the historical minimum was 57.9°F on 2017.

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 histoorical minimum and others when it was close to the historical maximum. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 60.9°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
Aug 21	60.2°F	61.9°F	64.1°F
Aug 22	60.7°F	61.7°F	63.6°F
Aug 23	59.9°F	63.1°F	63.2°F
Aug 24	59.3°F	63.5°F	63.2°F
Aug 25	61.7°F	63.0°F	63.3°F
Aug 26	64.6°F	60.8°F	63.2°F
Aug 27	65.4°F	61.8°F	63.6°F
Aug 28	65.6°F	62.4°F	63.7°F
Aug 29	65.8°F	62.1°F	64.0°F
Aug 30	63.8°F	61.4°F	63.4°F
Aug 31	64.3°F	61.4°F	63.3°F
Sep 1	63.7°F	61.5°F	63.0°F
Sep 2	64.5°F	62.0°F	62.6°F
Sep 3	63.3°F	63.1°F	61.9°F
Sep 4	60.8°F	62.9°F	61.6°F
Sep 5	60.9°F	63.9°F	61.7°F
Sep 6	60.9°F	63.1°F	61.7°F
Sep 7	61.0°F	62.2°F	61.8°F
Sep 8	60.8°F	61.7°F	61.6°F
Sep 9	60.7°F	62.7°F	61.5°F
Sep 10	60.9°F	62.3°F	61.7°F
Sep 11	60.7°F	61.1°F	61.5°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.