Things to Do in Koh Samui in May
May weather, activities, events & insider tips
May Weather in Koh Samui
Is May Right for You?
Advantages
- Post-Songkran calm means 40% fewer crowds at beaches like Chaweng and Lamai, with accommodation rates dropping 20-30% from April peaks
- Ocean temperatures reach perfect 28-29°C (82-84°F) for extended swimming and snorkeling without wetsuits
- Afternoon rain showers (typically 2-4pm) provide natural air conditioning and create dramatic sunset lighting for photography
- Mango season peaks in May - local varieties like nam dok mai and ok rong cost ฿40-60/kg at markets vs ฿120+ imported later
Considerations
- Humidity averages 70% making midday activities feel significantly hotter than the actual 32°C (91°F) temperature
- Thunderstorms can disrupt boat transfers to nearby islands, with 15-20% of scheduled trips cancelled or delayed
- Some beach clubs reduce operating hours or close entirely during heavy afternoon downpours between 2-5pm
Best Activities in May
Ang Thong Marine Park Island Hopping
May's calmer seas (post-monsoon transition) make this the ideal time for multi-island tours. Morning departures avoid afternoon storms, and you'll experience the emerald lagoon at Koh Mae Ko with crystal clarity. The 70% humidity actually works in your favor here - ocean breezes provide natural cooling.
Temple Circuit Cycling at Dawn
May's early morning temperatures (24-26°C/75-79°F) create perfect cycling conditions before 9am. Visit Wat Plai Laem and Big Buddha Temple when morning mist creates ethereal photography conditions. Local monks' morning routines are most visible during this season.
Namuang Waterfall Swimming Sessions
May's increased rainfall swells Namuang Falls to their most impressive volumes. The natural pools reach ideal swimming temperature, and the 500m (1,640 ft) jungle hike provides natural shade. Locals flock here during afternoon rain breaks.
Traditional Cooking Classes in Air-Conditioned Venues
May's humidity makes outdoor cooking uncomfortable, but indoor culinary schools thrive. Learn to balance flavors using seasonal ingredients like young coconuts and fresh herbs that peak during the rainy transition. Many schools offer market tours timed around morning freshness.
Sunset Beach Bar Crawling
May's dramatic storm-cleared skies create spectacular sunsets, especially from elevated venues. The shoulder season means less crowded beach bars and better service. Rain typically clears by 6pm, leaving fresh air and dramatic cloud formations for golden hour photography.
Spa and Wellness Retreats
May's humidity actually enhances traditional Thai massage and herbal steam treatments. Many spas offer rain-season promotions with 20-30% discounts. The sound of afternoon rain on spa pavilion roofs creates an authentic tropical wellness experience that peak season visitors miss.
May Events & Festivals
Visakha Bucha Day Temple Ceremonies
This major Buddhist holiday (typically mid-May) features candlelit processions at Big Buddha Temple and Wat Plai Laem. Locals dress in white and participate in evening circumambulation rituals. It's one of the most authentic cultural experiences available to visitors.