July is the hottest month in Belfast with an average temperature of 15°C (59°F) and the coldest is January at 4°C (39°F) with the most daily sunshine hours at 6 in June. The wettest month is October with an average of 90mm of rain. The best month to swim in the sea is in August when the average sea temperature is 15°C (58°F).
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Sunrise 07:31
Sunset 16:46
Sunrise 07:31
Sunset 16:46