June is the hottest month in Ha Long Bay with an average temperature of 29°C (84°F) and the coldest is January at 17°C (63°F) with the most daily sunshine hours at 8 in December. The wettest month is August with an average of 265mm of rain. The best month to swim in the sea is in January when the average sea temperature is 29°C (84°F).
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Sunrise 06:01
Sunset 17:11