Current Sea Water Temperature:
+46.4°F
| Maximum Sea Water Temperature in March: | 47.8°F |
| Minimum Sea Water Temperature in March: | 41.8°F |
| Average water temperature in March: | 44.7°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| March 29 | 46.4°F | March 24 | 45.8°F |
| March 28 | 46.2°F | March 23 | 45.8°F |
| March 27 | 45.8°F | March 22 | 45.4°F |
| March 26 | 46.2°F | March 21 | 45.8°F |
| March 25 | 46.0°F | March 20 | 45.2°F |
When is the Warmest Sea for Belfast?
According to our data for the last three years for Belfast the highest average sea water temperature was in August, September and July.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Belfast was 62.2°F. The maximum and minimum values were 59.6°F and 64.2°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Belfast was 59.7°F. The maximum and minimum values were 57.8°F and 62.2°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Belfast was 60.6°F. The maximum and minimum values were 58.6°F and 63.4°F respectively.
United Kingdom Resorts:
NAME
F°
| Bath |  |
+38 |
| Belfast |  |
+42 |
| Bournemouth | |
+42 |
| Brighton | |
+44 |
| Bristol | |
+40 |
| Edinburgh |  |
+38 |
| Gibraltar |  |
+52 |
| Glasgow | |
+38 |
| Liverpool | |
+42 |
| London | |
+42 |
| Middlesbrough | |
+38 |
| Plymouth | |
+46 |
| Scarborough | |
+40 |
| Torquay | |
+42 |
| York | |
+38 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Belfast
Local time: 07:03
30 mar, monday
| 0900 |  |
42°F | SE 17 mph |
| 1200 | |
48°F | SE 19 mph |
| 1500 | |
50°F | SE 17 mph |
| 1800 | |
48°F | E 12 mph |
| 2100 | |
46°F | E 8 mph |
31 mar, tuesday
| 0000 | |
48°F | E 11 mph |
| 0300 | |
50°F | E 13 mph |
| 0600 | |
46°F | E 9 mph |