Current sea water temperature:
+46.6°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 15 | 46.6°F | January 10 | 47.7°F |
| January 14 | 46.6°F | January 9 | 47.8°F |
| January 13 | 46.9°F | January 8 | 48.0°F |
| January 12 | 46.9°F | January 7 | 47.8°F |
| January 11 | 47.5°F | January 6 | 48.0°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: 07:13
January 16, friday
0900
36°F
NW
4 mph
4 mph
1200
45°F
NW
8 mph
8 mph
1500
43°F
NW
7 mph
7 mph
1800
39°F
NW
8 mph
8 mph
2100
41°F
NW
13 mph
13 mph
January 17, saturday
0000
41°F
NW
9 mph
9 mph
0300
43°F
NW
7 mph
7 mph
0600
41°F
NW
9 mph
9 mph
