Measurements:
°C
°F
CURRENT WEATHER
23:03
Belfast
50°F
NW 9 mph
Feels like: 48°F
Precip: 30%
World Resorts United Kingdom Belfast Weather

7 Day Weather Forecast

09.28
mon
DAY
58°F
N 9 mph
precip
10%
NIGHT
50°F
NW 9 mph
precip
30%
09.29
tue
DAY
56°F
NW 20 mph
precip
30%
NIGHT
62°F
NW 21 mph
precip
66%
09.30
wed
DAY
62°F
N 17 mph
precip
6%
NIGHT
50°F
NE 14 mph
precip
9%
10.01
thu
DAY
56°F
NE 9 mph
precip
6%
NIGHT
50°F
NE 11 mph
precip
14%
10.02
fri
DAY
60°F
NE 13 mph
precip
16%
NIGHT
48°F
N 6 mph
precip
23%
10.03
sat
DAY
58°F
N 12 mph
precip
24%
NIGHT
54°F
E 7 mph
precip
41%
10.04
sun
DAY
54°F
SE 13 mph
precip
12%
NIGHT
44°F
SE 4 mph
precip
15%

Belfast Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Belfast was 15.4°F. The maximum and minimum values were 14.7°F and 16.4°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 58.7 °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