Best Time to Visit Koh Samui (2026)
Quick Answer
The best time to visit Koh Samui is December, January, February, March, April. December-April is Koh Samui's driest, sunniest stretch, ideal for beaches and boat trips. Uniquely, this Gulf-side island also has a secondary dry window in July-September, while October-November brings the heaviest rain.
Best Months
Dec - Apr, Jul - Sep
Daily Budget
THB 1800-6500/day
Currency
THB
Language
Thai, English
Koh Samui Weather by Month
Jan
Warm, dry
Peak dry season, ideal for Ang Thong boat trips
Feb
Warm, dry
Best beach weather of the year
Mar
Hot, dry
Still dry, warming toward summer
Apr
Very hot, dry
Hot but dry, Songkran festival
May
Hot, increasing rain
Rain becoming more frequent
Jun
Warm, secondary dry spell
Brief drier window before monsoon peak
Jul
Warm, secondary dry spell
Good conditions despite mainland Thailand's monsoon
Aug
Warm, secondary dry spell
Still favourable on the Gulf side
Sep
Warm, rain increasing
Rain picking up ahead of peak monsoon
Oct
Heavy rain, storms
Wettest month, rough seas for boat trips
Nov
Heavy rain, storms
Still very wet, some ferry cancellations
Dec
Warm, dry
Dry season returns, peak holiday season
Frequently Asked Questions
Is Koh Samui good for a honeymoon?
Koh Samui is an excellent honeymoon destination. The best time for couples is Dec - Apr, Jul - Sep when the weather is ideal. Expect to budget around THB 1800-6500/day per day for a comfortable stay.
Can I visit Koh Samui on a budget?
Yes, Koh Samui can be visited on a budget. Average daily costs are THB 1800-6500/day. Budget travellers can find affordable accommodation and food while still experiencing the best the city has to offer.
How many days should I spend in Koh Samui?
We recommend 3-5 days in Koh Samui to see the main attractions. A week gives you time to explore at a relaxed pace and discover hidden gems beyond the tourist trail.
Full Travel Guide
Ready to plan your Koh Samui trip?
Things to do, where to stay, hidden gems and insider tips — all free.
Read the Full Koh Samui Guide →