All data are in degrees Fahrenheit

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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

59.1

°F

September 13, 07:41

Trend:

decreasing

Yesterday:

59.2°F

Tomorrow:

59.0°F

Sunrise:

06:52

Sunset:

19:46

Day Length:

12 h. 54 min.

Belfast in September

Minimum:

42.4°F

Average:

47.5°F

Maximum:

49.0°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 59.1°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 0.9°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

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 60.7°F on 2023, while the historical minimum was 55.9°F on 2015.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest 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 58.9°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 30 61.2°F 58.4°F 58.6°F
Aug 31 61.1°F 58.4°F 58.5°F
Sep 1 60.9°F 58.3°F 58.5°F
Sep 2 60.7°F 58.3°F 58.4°F
Sep 3 60.4°F 58.3°F 58.3°F
Sep 4 60.2°F 58.4°F 58.2°F
Sep 5 60.1°F 58.5°F 58.2°F
Sep 6 60.2°F 58.5°F 58.3°F
Sep 7 60.0°F 58.9°F 58.4°F
Sep 8 59.8°F 59.4°F 58.5°F
Sep 9 59.7°F 59.3°F 58.6°F
Sep 10 59.6°F 59.1°F 58.5°F
Sep 11 59.3°F 58.8°F 58.4°F
Sep 12 59.2°F 58.5°F 58.2°F
Sep 13 59.1°F 58.4°F 58.1°F
Sep 14 59.0°F 58.2°F 58.1°F
Sep 15 59.0°F 58.0°F 58.1°F
Sep 16 59.0°F 58.2°F 58.1°F
Sep 17 58.9°F 58.0°F 58.0°F
Sep 18 58.9°F 58.1°F 58.0°F
Sep 19 58.9°F 58.2°F 58.0°F
Sep 20 58.8°F 58.0°F 57.8°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 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, 47.9°F in Spring, 56.6°F in Summer, and 55.7°F in Autumn.