Thailand
Best Time to Visit Ko Samui
Ko Samui, Thailand is a tropical island with a dry season from December to April and a rainy season from May to November. The best time to visit Ko Samui is during the dry season, when the weather is pleasant and the crowds are manageable. However, the island's popularity and hotel prices vary throughout the year.
✦ Visit Ko Samui in December, January, or February for a pleasant and relaxed atmosphere, and consider visiting in November or March for a more budget-friendly option.
✅ Best months
December, January, and February offer the best combination of pleasant weather and manageable crowds, making them the ideal months to visit Ko Samui.
🔥 Peak season
April is the peak month, with high hotel prices and large crowds. The Songkran Water Festival in mid-April draws many tourists, and the island's resorts and hotels are fully booked. Hotel prices increase by up to 50% during this time.
💷 Shoulder (best value)
The shoulder months of November and March offer a good balance of decent weather and lower prices. Visitors can find discounts of up to 30% on hotel rates, and the crowds are smaller than during the peak season.
🌙 Quietest & cheapest
The quietest and cheapest period is from May to October, but be prepared for frequent rain showers and potential flooding. The rainy season also brings fewer tourists, making it a good time for those who want to avoid the crowds.
Ko Samui season by season
Spring (Mar–May)
Weather: Temperatures range from 25°C to 32°C (77°F to 90°F), with occasional rain showers
Crowds: Low
Good time for snorkelling and diving
Summer (Jun–Aug)
Weather: Hot and humid, with frequent rain showers and temperatures up to 35°C (95°F)
Crowds: Medium
Best time for water sports
Autumn (Sep–Nov)
Weather: Warm and sunny, with temperatures ranging from 25°C to 30°C (77°F to 86°F)
Crowds: Medium
Good time for island-hopping
Winter (Dec–Feb)
Weather: Dry and pleasant, with temperatures ranging from 20°C to 28°C (68°F to 82°F)
Crowds: Low/medium
Best time for relaxation
🎭 Events worth timing a trip around
The Loy Krathong festival in November and the Ko Samui Regatta in April are two major events worth timing a trip around. However, the Songkran Water Festival in April can be overwhelming for some visitors.
🧳 What to pack
Don't forget to pack a light rain jacket or poncho, as sudden rain showers can occur throughout the year.
Found your dates? Get your hotel briefing.
Room tips, the 14-day forecast for your exact stay, dining, transport and more — free for any Ko Samui hotel.
Researched & reviewed by the TripSage editorial team · Updated July 2026.