The best time to dive in Belize is from March to December. During this period the weather is dry and the visibility and surface conditions are at their best. Visibility in Belize is excellent, from 65-130 ft. (20-40 m). It is worth noting that during plankton blooms in the summer visibility will be reduced but rarely below 65 ft. (20 m). Temperature doesn’t vary too much over the course of the year, in the winter months it can drop to around 79° F (26° C) and rise to 86° F (30° C) in the summer. The diving season in Belize for whale sharks is late spring, early summer, between April and June. By June the chances of seeing whale sharks are greater in the southern region. Summer plankton blooms also attract mantas from August until the end of November.