Plan Your Trip Weather Cat Ba Island Weather & Climate Halong Bay Weather Halong Bay Weather in April Halong Bay Weather in August Halong Bay Weather in December Halong Bay Weather in February Halong Bay Weather in January Halong Bay Weather in July Halong Bay Weather in June Halong Bay Weather in March Halong Bay Weather in May Halong Bay Weather in November Halong Bay Weather in October Halong Bay Weather in September The Best Time to Visit Halong Bay