Current sea water temperature:
+46.9°F
| Minimum sea water temperature in January: | 50.2°F |
| Maximum sea water temperature in January: | 42.4°F |
| Average sea water temperature in January: | 47.2°F |
| more information | |
14 days
forecast
forecast
| Belfast |
monthly
weather
weather
| Belfast |
Sea water temperature for the last 10 days:
| January 12 | 46.9°F | January 7 | 47.8°F |
| January 11 | 47.5°F | January 6 | 48.0°F |
| January 10 | 47.7°F | January 5 | 48.0°F |
| January 9 | 47.8°F | January 4 | 48.0°F |
| January 8 | 48.0°F | January 3 | 47.8°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
January
January
| Belfast |
Best time for vacation in Belfast
Belfast on a weather map
Places in United Kingdom:
Name
°F
24 Hours Forecast
Belfast
Local time: 23:53
January 13, tuesday
0000
43°F
N
3 mph
3 mph
0300
43°F
N
5 mph
5 mph
0600
37°F
SE
12 mph
12 mph
0900
39°F
E
9 mph
9 mph
1200
41°F
E
11 mph
11 mph
1500
41°F
E
14 mph
14 mph
1800
36°F
E
10 mph
10 mph
2100
36°F
E
9 mph
9 mph
