Best Times to Dive Koh Tao by Season - Koh Tao Dive Guide

Best Times to Dive Koh Tao by Season

Best Times to Dive Koh Tao by Season

Summary

The best diving season at Koh Tao is November–May, offering consistent 15–25m visibility, calm conditions, and warm water (27–30°C). The shoulder months (June–October) are still diveable with lower visibility but fewer crowds and reduced prices.

Details

• Peak season (Nov–May): Dry season delivers optimal conditions—best visibility (15–25m), calm mornings, stable weather, and warmest water; popular sites are busiest; course prices are standard
• Shoulder season (June–Oct): Monsoon months bring occasional rain and swell; visibility drops to 10–15m; mornings are often calmer than afternoons; fewer tourists mean lower prices and smaller class groups
• Whale shark season (Mar–May): Peak plankton blooms increase whale shark sightings at Sail Rock and Chumphon Pinnacle; visibility can temporarily drop but rewards justify it
• Water temperature: Consistent 27–30°C year-round eliminates the need for thick wetsuits; most divers use 3mm or rashguards year-round
• Budget consideration: Open Water (~$350–450 USD) and Advanced courses (~$280–350 USD) are offered year-round; shoulder season offers better value and smaller groups

Related questions

• What's the visibility like at Koh Tao?
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• How much does a PADI course cost?

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