Current sea water temperature:
+52.3°F
| Minimum sea water temperature in May: | 57.2°F |
| Maximum sea water temperature in May: | 45.7°F |
| Average sea water temperature in May: | 50.4°F |
| more information | |
14 days
forecast
forecast
| Belfast |
monthly
weather
weather
| Belfast |
Sea water temperature for the last 10 days:
| May 3 | 52.3°F | April 28 | 52.0°F |
| May 2 | 52.7°F | April 27 | 51.6°F |
| May 1 | 53.2°F | April 26 | 51.1°F |
| April 30 | 52.7°F | April 25 | 50.5°F |
| April 29 | 52.2°F | April 24 | 49.5°F |
Monthly sea water temperature, °F
When is the warmest sea in Belfast?
Based on the data about daily sea water temperature for the last three years the warmest sea in Belfast was noticed in August, September and July.
Monthly Sea Temperatures in Belfast, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 61.0°F. The highest and lowest sea temperatures during the month were 62.8°F and 58.6°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 58.7°F. The highest and lowest sea temperatures during the month were 61.0°F and 57.0°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 59.5°F. The highest and lowest sea temperatures during the month were 62.1°F and 57.7°F.
current
weather
weather
| Belfast |
weather in
May
May
| Belfast |
Best time for vacation in Belfast
Belfast on a weather map
Places in United Kingdom:
Name
°F
24 Hours Forecast
Belfast
Local time: 09:53
May 03, sunday
1200
48°F
SW
9 mph
9 mph
1500
48°F
SW
8 mph
8 mph
1800
48°F
SW
6 mph
6 mph
2100
46°F
S
4 mph
4 mph
May 04, monday
0000
46°F
SE
3 mph
3 mph
0300
43°F
SE
6 mph
6 mph
0600
37°F
SE
6 mph
6 mph
0900
46°F
SE
9 mph
9 mph
