Current sea water temperature:
+45.7°F
| Minimum sea water temperature in March: | 48.0°F |
| Maximum sea water temperature in March: | 42.6°F |
| Average sea water temperature in March: | 45.2°F |
| more information | |
14 days
forecast
forecast
| Belfast |
monthly
weather
weather
| Belfast |
Sea water temperature for the last 10 days:
| March 20 | 45.7°F | March 15 | 45.9°F |
| March 19 | 46.0°F | March 14 | 45.7°F |
| March 18 | 46.0°F | March 13 | 46.2°F |
| March 17 | 45.5°F | March 12 | 46.8°F |
| March 16 | 45.7°F | March 11 | 46.2°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
March
March
| Belfast |
Best time for vacation in Belfast
Belfast on a weather map
Places in United Kingdom:
Name
°F
24 Hours Forecast
Belfast
Local time: 16:12
March 20, friday
1800
48°F
NE
4 mph
4 mph
2100
43°F
NE
5 mph
5 mph
March 21, saturday
0000
41°F
E
3 mph
3 mph
0300
39°F
E
4 mph
4 mph
0600
37°F
E
2 mph
2 mph
0900
46°F
E
2 mph
2 mph
1200
54°F
NE
4 mph
4 mph
1500
55°F
NE
6 mph
6 mph
