Measurements:
°C
°F
CURRENT WEATHER
15:44
Belfast
54°F
NW 9 mph
Feels like: 52°F
Precip: 0%
World Resorts United Kingdom Belfast Weather

7 Day Weather Forecast

05.18
mon
DAY
54°F
NW 6 mph
precip
86%
NIGHT
48°F
NW 12 mph
precip
100%
05.19
tue
DAY
56°F
NE 7 mph
precip
100%
NIGHT
50°F
NW 4 mph
precip
100%
05.20
wed
DAY
54°F
NE 14 mph
precip
100%
NIGHT
54°F
N 8 mph
precip
60%
05.21
thu
DAY
66°F
NE 12 mph
precip
100%
NIGHT
54°F
NW 5 mph
precip
0%
05.22
fri
DAY
68°F
NE 9 mph
precip
70%
NIGHT
56°F
NE 5 mph
precip
0%
05.23
sat
DAY
64°F
SE 4 mph
precip
80%
NIGHT
48°F
SW 2 mph
precip
0%
05.24
sun
DAY
66°F
W 4 mph
precip
0%
NIGHT
52°F
NE 4 mph
precip
0%

Belfast Sea Water Temperature in May, °F

Select Year: 2026 2025 2024

The average sea surface temperature in May 2026 for Belfast was 11.6°F. The maximum and minimum values were 11.2°F and 11.9°F respectively.

Belfast on the Weather Map

Best Time to Visit Belfast
The most sunny months:
May 6 days
April 6 days
March 5 days
The most warm months:
July 64.8 °F
August 64.5 °F
June 62.2 °F
Warmest sea temperature:
August 58.7 °F
September 58.5 °F
July 57.4 °F
The most cold months:
January 43.0 °F
February 45.0 °F
December 45.1 °F
The most rainy months:
July 7 days
June 6 days
August 6 days
The most windy months:
February 13 mph
December 13 mph
January 12 mph
more details