26.08
wed
wed
Day
64°F
W 14 mph
Precip.
22%
22%
Night
59°F
W 9 mph
Precip.
16%
16%
27.08
thu
thu
Day
68°F
W 12 mph
Precip.
12%
12%
Night
61°F
SW 6 mph
Precip.
27%
27%
28.08
fri
fri
Day
68°F
SE 12 mph
Precip.
5%
5%
Night
55°F
SE 1 mph
Precip.
33%
33%
29.08
sat
sat
Day
57°F
W 7 mph
Precip.
57%
57%
Night
55°F
E 8 mph
Precip.
36%
36%
30.08
sun
sun
Day
61°F
NE 4 mph
Precip.
18%
18%
Night
55°F
SE 6 mph
Precip.
65%
65%
31.08
mon
mon
Day
59°F
E 14 mph
Precip.
17%
17%
Night
57°F
N 15 mph
Precip.
68%
68%
01.09
tue
tue
Day
57°F
E 19 mph
Precip.
27%
27%
Night
48°F
E 9 mph
Precip.
21%
21%
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.
Air temperature in Belfast, °F
Precipitation total in Belfast, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Belfast
Belfast on a weather map
Places in United Kingdom:
Name
°F
24 Hours Forecast
Belfast
Local time: 19:15
August 26, wednesday
2100
59°F
W
6 mph
6 mph
August 27, thursday
0000
59°F
W
9 mph
9 mph
0300
57°F
W
9 mph
9 mph
0600
57°F
W
10 mph
10 mph
0900
61°F
W
12 mph
12 mph
1200
68°F
W
12 mph
12 mph
1500
72°F
W
12 mph
12 mph
1800
70°F
SW
7 mph
7 mph
