Current sea water temperature:
+58.5°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: | 57.8°F |
| more information | |
14 days
forecast
forecast
| Belfast |
monthly
weather
weather
| Belfast |
Sea water temperature for the last 10 days:
| September 28 | 58.5°F | September 23 | 59.0°F |
| September 27 | 58.8°F | September 22 | 59.4°F |
| September 26 | 59.0°F | September 21 | 59.0°F |
| September 25 | 59.0°F | September 20 | 58.8°F |
| September 24 | 59.4°F | September 19 | 59.2°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:
2026
2025
2024
The average sea water temperature in September of 2026 was 59.8°F. The highest and lowest sea temperatures during the month were 61.5°F and 58.5°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
October
October
| Belfast |
Best time for vacation in Belfast
Belfast on a weather map
Places in United Kingdom:
Name
°F
24 Hours Forecast
Belfast
Local time: 04:19
September 29, tuesday
0600
52°F
NW
16 mph
16 mph
0900
54°F
NW
19 mph
19 mph
1200
57°F
NW
21 mph
21 mph
1500
57°F
NW
23 mph
23 mph
1800
63°F
NW
22 mph
22 mph
2100
64°F
NW
22 mph
22 mph
September 30, wednesday
0000
61°F
NW
22 mph
22 mph
0300
61°F
N
14 mph
14 mph
