Current Sea Water Temperature:
+53.2°F
| Maximum Sea Water Temperature in May: | 58.0°F |
| Minimum Sea Water Temperature in May: | 45.2°F |
| Average water temperature in May: | 50.5°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| May 18 | 53.2°F | May 13 | 53.6°F |
| May 17 | 53.0°F | May 12 | 53.2°F |
| May 16 | 53.6°F | May 11 | 53.4°F |
| May 15 | 53.8°F | May 10 | 53.2°F |
| May 14 | 53.8°F | May 09 | 52.6°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 |  |
+54 |
| Belfast |  |
+54 |
| Bournemouth | |
+56 |
| Brighton |  |
+54 |
| Bristol | |
+56 |
| Edinburgh | |
+54 |
| Gibraltar | |
+68 |
| Glasgow | |
+52 |
| Liverpool | |
+56 |
| London | |
+58 |
| Middlesbrough |  |
+56 |
| Plymouth | |
+52 |
| Scarborough | |
+50 |
| Torquay | |
+54 |
| York | |
+58 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Belfast
Local time: 14:41
18 may, monday
| 1500 |  |
54°F | NW 9 mph |
| 1800 | |
52°F | NW 12 mph |
| 2100 |  |
48°F | NW 11 mph |
19 may, tuesday
| 0000 | |
48°F | NW 12 mph |
| 0300 |  |
46°F | NW 17 mph |
| 0600 | |
48°F | NW 18 mph |
| 0900 | |
50°F | NW 14 mph |
| 1200 | |
56°F | NE 7 mph |