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

54.8

°F

October 18, 18:39

Trend:

increasing

Yesterday:

54.5°F

Tomorrow:

55.1°F

Sunrise:

06:34

Sunset:

19:56

Day Length:

13 h. 22 min.

Belfast in October

Minimum:

60.3°F

Average:

63.1°F

Maximum:

66.0°F

Sea water temperature in Belfast today

As of now, in Belfast, the water temperature is 54.8°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 1.2°F higher 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 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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 54.6°F on 2021, while the historical minimum was 52.9°F on 2023.

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. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 56.0°F, with minimum temperature starting at 55.1°F, while the maximum might reach 56.9°F.

Daily water temperature in Belfast

Date Current Year

actual* / forecast**

last year 10 years average
Oct 4 51.8°F 52.2°F 52.1°F
Oct 5 52.0°F 52.4°F 52.2°F
Oct 6 51.9°F 53.1°F 52.3°F
Oct 7 52.2°F 53.4°F 52.5°F
Oct 8 51.8°F 54.3°F 52.5°F
Oct 9 52.1°F 53.1°F 52.6°F
Oct 10 52.5°F 52.8°F 52.8°F
Oct 11 52.7°F 53.0°F 53.0°F
Oct 12 53.8°F 53.5°F 53.2°F
Oct 13 53.3°F 54.9°F 53.2°F
Oct 14 53.4°F 54.8°F 53.2°F
Oct 15 53.4°F 53.8°F 53.2°F
Oct 16 53.6°F 53.4°F 53.1°F
Oct 17 54.5°F 53.9°F 53.3°F
Oct 18 54.8°F 54.0°F 53.6°F
Oct 19 55.1°F 54.4°F 53.9°F
Oct 20 55.6°F 55.0°F 54.4°F
Oct 21 55.9°F 56.0°F 54.7°F
Oct 22 56.1°F 57.1°F 55.0°F
Oct 23 56.3°F 57.5°F 55.1°F
Oct 24 56.4°F 58.3°F 55.2°F
Oct 25 56.9°F 58.9°F 55.7°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 January 31, 2018, reaching a 69.7°F. While the coldest temperature occurred on August 12, 2015, dipping to 45.5°F. The average readings by season are 62.8°F in Winter, 59.0°F in Spring, 49.7°F in Summer, and 53.9°F in Autumn.