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Belfast in December

Find out everything about the water temperature in Belfast in December. Average, minimum and maximum recorded temperatures as well as daily temperature in December for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in December
Minimum:

39.1 °F

Average:

44.1 °F

Maximum:

48.8 °F

Sea water temperature in Belfast in December

In the city of Belfast, the month of December is too cold for swimming. The minimum recorded temperature during this month was 39.1°F on December 31, 2018, with an average temperature being 44.1°F and a maximum temperature reaching 48.8°F on December 1, 2022.

Swing in the water of such temperature might lead to potential hypothermia within just a few minutes. Throughout the month of December, the sea temperature gradually gets colder. Starting with an average temperature of 46.1°F at the beginning of the month, it steadily decreases to around 42.4°F by the end.
Date 10 years average 2024 2023
Dec 1 47.0°F 46.8°F 46.3°F
Dec 2 46.8°F 46.1°F 46.8°F
Dec 3 46.8°F 45.6°F 46.4°F
Dec 4 46.7°F 45.5°F 46.3°F
Dec 5 46.5°F 45.3°F 46.1°F
Dec 6 46.2°F 45.3°F 46.3°F
Dec 7 45.8°F 45.5°F 44.6°F
Dec 8 45.3°F 44.9°F 44.4°F
Dec 9 45.1°F 44.5°F 44.5°F
Dec 10 45.0°F 44.3°F 44.3°F
Dec 11 44.9°F 44.1°F 44.2°F
Dec 12 44.6°F 43.9°F 43.6°F
Dec 13 44.6°F 44.1°F 43.8°F
Dec 14 44.1°F 43.8°F 41.2°F
Dec 15 43.7°F 43.1°F 41.5°F
Dec 16 43.7°F 43.1°F 42.2°F
Dec 17 43.5°F 42.8°F 42.0°F
Dec 18 43.6°F 41.0°F 42.5°F
Dec 19 43.7°F 41.0°F 45.5°F
Dec 20 43.3°F 41.7°F 45.1°F
Dec 21 43.4°F 41.8°F 42.4°F
Dec 22 43.2°F 41.7°F 42.9°F
Dec 23 43.0°F 41.5°F 42.4°F
Dec 24 42.8°F 41.3°F 41.9°F
Dec 25 42.6°F 41.1°F 41.9°F
Dec 26 42.5°F 41.0°F 41.4°F
Dec 27 42.3°F 40.8°F 41.3°F
Dec 28 42.2°F 40.6°F 41.2°F
Dec 29 41.8°F 40.3°F 41.1°F
Dec 30 41.5°F 40.0°F 41.1°F
Dec 31 41.1°F 39.6°F 40.9°F

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 March 2, 2015, dipping to 32.0°F. The average readings by season are 39.8°F in Winter, 41.6°F in Spring, 60.3°F in Summer, and 55.6°F in Autumn. December's average temperature is a slight drop from November's average of 50.5°F. In January, the temperature is expected to decrease further, potentially averaging around 39.0°F.