Diving is possible year round with peak seasons tending to be around March, April and again from June to September. During these time visibility can reach up to 30 meters. The monsoon season in the Gulf of Thailand starts in November and goes until about January. Though it is typically rainy only in November, diving is still possible. Whale sharks, Minke Whales, pilot whales and Bruda Whales have been spotted around Koh Tao during these months.
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