Current sea water temperature:
+60.3°F
| Minimum sea water temperature in September: | 61.5°F |
| Maximum sea water temperature in September: | 55.0°F |
| Average sea water temperature in September: | 57.7°F |
| more information | |
14 days
forecast
forecast
| Belfast |
monthly
weather
weather
| Belfast |
Sea water temperature for the last 10 days:
| September 8 | 60.3°F | September 3 | 61.2°F |
| September 7 | 60.6°F | September 2 | 61.2°F |
| September 6 | 60.6°F | September 1 | 61.5°F |
| September 5 | 60.8°F | August 31 | 61.9°F |
| September 4 | 60.8°F | August 30 | 61.5°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:
2026
2025
2024
The average sea water temperature in August of 2026 was 61.3°F. The highest and lowest sea temperatures during the month were 63.0°F and 59.9°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 60.9°F. The highest and lowest sea temperatures during the month were 63.7°F and 55.9°F.
current
weather
weather
| Belfast |
weather in
September
September
| Belfast |
Best time for vacation in Belfast
Belfast on a weather map
Places in United Kingdom:
Name
°F
24 Hours Forecast
Belfast
Local time: 12:31
September 08, tuesday
1500
61°F
SE
21 mph
21 mph
1800
57°F
SE
19 mph
19 mph
2100
52°F
SE
16 mph
16 mph
September 09, wednesday
0000
54°F
SE
14 mph
14 mph
0300
48°F
SE
12 mph
12 mph
0600
50°F
E
9 mph
9 mph
0900
54°F
E
11 mph
11 mph
1200
59°F
E
13 mph
13 mph
