Things to Do in Koh Samui in May
May weather, activities, events & insider tips
May Weather in Koh Samui
34°C (93°F)
High Temp
26°C (79°F)
Low Temp
150 mm (5.9 inches)
Rainfall
70%
Humidity
Is May Right for You?
Advantages
- Lower tourist crowds compared to peak season
- Lush green landscapes from early rainy season
- Cheaper accommodation rates before high season
- Excellent conditions for water activities with calm seas
Considerations
- Unpredictable afternoon rain disrupts outdoor plans
- Higher humidity makes extended outdoor activities challenging
- Some island boat tours might have limited schedules
Best Activities in May
Island Snorkeling Tours
May offers calm seas and excellent underwater visibility before full rainy season. Water temperatures around 29°C (84°F) provide comfortable snorkeling conditions.
Booking Tip: Book 10-14 days ahead through licensed operators. Morning tours recommended to avoid afternoon rain.
Temple and Cultural Cycling Routes
Early morning routes before heat peaks. Lush green landscapes provide stunning backdrops for cultural exploration.
Booking Tip: Rent bikes with included rain protection. Book morning slots to avoid midday heat.
Rainforest Hiking and Nature Trails
Vegetation at peak greenness. Waterfalls running strong. Wildlife more active in cooler morning hours.
Booking Tip: Bring waterproof gear. Choose guided tours with experienced local naturalists.
Wellness and Spa Experiences
Perfect month for indoor wellness activities. Lower tourist density means more personalized treatments.
Booking Tip: Book treatments in advance. Look for packages combining multiple services.
Essential Tips
What to Pack
Lightweight, quick-dry clothing in breathable fabrics
Waterproof jacket with hood for sudden rain showers
High SPF sunscreen (50+) for high UV index
Moisture-wicking underwear and socks
Reef-safe sunscreen for water activities
Compact travel umbrella
Waterproof phone case
Lightweight, long-sleeve shirts for sun protection
Water-resistant hiking shoes for trails
Electrolyte powder packets for hydration
Insider Knowledge
Early morning (6-9am) best for outdoor activities
Negotiate prices for accommodations - May is shoulder season
Carry a small towel for unexpected rain and humidity
Stay hydrated - humidity levels can be challenging
Avoid These Mistakes
Overpacking heavy clothing
Not bringing waterproof gear
Planning full-day outdoor itineraries
Underestimating humidity's impact