April is the hottest month in Gampaha with an average temperature of 29°C (84°F) and the coldest is January at 27°C (81°F). The wettest month is June with an average of 105mm of rain. The best month to swim in the sea is in April when the average sea temperature is 30°C (86°F).
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Sunrise 06:03
Sunset 17:50
Sunrise 06:03
Sunset 17:50