Measurements:
°C
°F
CURRENT WEATHER
22:01
Belfast
52°F
SE 17 mph
Feels like: 46°F
Precip: 22%
World Resorts United Kingdom Belfast Weather

7 Day Weather Forecast

09.08
tue
DAY
58°F
E 18 mph
precip
27%
NIGHT
54°F
SE 16 mph
precip
22%
09.09
wed
DAY
60°F
E 13 mph
precip
19%
NIGHT
50°F
N 6 mph
precip
25%
09.10
thu
DAY
60°F
NE 11 mph
precip
25%
NIGHT
54°F
E 11 mph
precip
43%
09.11
fri
DAY
60°F
E 10 mph
precip
15%
NIGHT
48°F
NE 6 mph
precip
23%
09.12
sat
DAY
56°F
N 12 mph
precip
76%
NIGHT
58°F
E 5 mph
precip
55%
09.13
sun
DAY
60°F
E 5 mph
precip
15%
NIGHT
56°F
N 6 mph
precip
23%
09.14
mon
DAY
70°F
NE 14 mph
precip
9%
NIGHT
62°F
NE 12 mph
precip
15%

Belfast Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Belfast was 14.9°F. The maximum and minimum values were 13.9°F and 16.1°F respectively.

Belfast on the Weather Map

Best Time to Visit Belfast
The most sunny months:
May 6 days
April 6 days
March 5 days
The most warm months:
July 64.9 °F
August 64.5 °F
June 62.2 °F
Warmest sea temperature:
August 58.9 °F
September 58.5 °F
July 57.7 °F
The most cold months:
January 43.0 °F
February 45.0 °F
December 45.1 °F
The most rainy months:
June 6 days
July 6 days
August 6 days
The most windy months:
February 13 mph
December 13 mph
January 12 mph
more details