Measurements:
°C
°F
Belfast
46°F
S 6 mph
Feels like: 44°F
Precip: 14%
World Resorts United Kingdom Belfast Weather

Belfast Sea Water Temperature

Current Sea Water Temperature:
+53.6°F
Maximum Sea Water Temperature in November: 56.8°F
Minimum Sea Water Temperature in November: 50.4°F
Average water temperature in November: 53.7°F

Sea Water Temperature for the Last 10 Days:

November 11 53.6°F November 06 53.0°F
November 10 53.6°F November 05 53.0°F
November 09 53.4°F November 04 53.4°F
November 08 53.4°F November 03 53.0°F
November 07 53.4°F November 02 53.6°F

When is the Warmest Sea for Belfast?

According to our data for the last three years for Belfast the highest average sea water temperature was in August, September and July.

Average Water Temperature by Month, °F

Sea Water Temperature in August

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Belfast was 62.6°F. The maximum and minimum values were 61.0°F and 64.4°F respectively.

Sea Water Temperature in September

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Belfast was 60.7°F. The maximum and minimum values were 58.6°F and 62.8°F respectively.

Sea Water Temperature in July

Select Year: 2026 2025 2024

The average sea surface temperature in July 2026 for Belfast was 62.1°F. The maximum and minimum values were 56.6°F and 65.2°F respectively.

Best Time to Visit Belfast
The most sunny months:
May 6 days
April 6 days
March 5 days
The most warm months:
July 64.9 °F
August 64.5 °F
June 62.2 °F
Warmest sea temperature:
August 58.9 °F
September 58.6 °F
July 57.7 °F
The most cold months:
January 43.0 °F
February 45.0 °F
December 45.1 °F
The most rainy months:
June 6 days
July 6 days
August 6 days
The most windy months:
February 13 mph
December 13 mph
January 12 mph

Belfast on the Weather Map

United Kingdom Resorts:
NAME
F°
Bath +46
Belfast +46
Bournemouth +48
Brighton +50
Bristol +46
Edinburgh +40
Gibraltar +64
Glasgow +40
Liverpool +48
London +48
Middlesbrough +46
Plymouth +50
Scarborough +48
Torquay +44
York +48
24 Hours Weather Forecast
Belfast
Local time: 11:26
11 nov, wednesday
1200 46°F
S
6 mph
1500 46°F
S
6 mph
1800 38°F
SE
6 mph
2100 34°F
SE
5 mph
12 nov, thursday
0000 40°F
S
9 mph
0300 40°F
S
12 mph
0600 34°F
S
6 mph
0900 38°F
SE
7 mph