16.09
wed
wed
Day
57°F
E 12 mph
Precip.
18%
18%
Night
55°F
NE 17 mph
Precip.
38%
38%
17.09
thu
thu
Day
52°F
E 16 mph
Precip.
37%
37%
Night
48°F
NE 12 mph
Precip.
17%
17%
18.09
fri
fri
Day
52°F
N 12 mph
Precip.
73%
73%
Night
59°F
NE 14 mph
Precip.
37%
37%
19.09
sat
sat
Day
59°F
E 17 mph
Precip.
16%
16%
Night
48°F
E 9 mph
Precip.
32%
32%
20.09
sun
sun
Day
52°F
NE 6 mph
Precip.
28%
28%
Night
61°F
NE 10 mph
Precip.
34%
34%
21.09
mon
mon
Day
66°F
E 9 mph
Precip.
8%
8%
Night
59°F
NE 4 mph
Precip.
15%
15%
22.09
tue
tue
Day
66°F
E 4 mph
Precip.
11%
11%
Night
55°F
NW 3 mph
Precip.
16%
16%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 60.3°F. The highest and lowest sea temperatures during the month were 61.5°F and 59.2°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: 05:25
September 16, wednesday
0600
52°F
E
11 mph
11 mph
0900
54°F
E
11 mph
11 mph
1200
57°F
E
12 mph
12 mph
1500
57°F
NE
11 mph
11 mph
1800
57°F
NE
13 mph
13 mph
2100
55°F
NE
17 mph
17 mph
September 17, thursday
0000
55°F
NE
17 mph
17 mph
0300
52°F
E
14 mph
14 mph
