The best time to visit koh samui for perfect weather and fewer crowds is between late february and early june. this period offers warm temperatures, clear skies, and lower humidity, making it ideal for beach activities. for fewer crowds, avoid peak season (december to february) when tourist numbers are high. september to november sees occasional heavy rains but has the best deals on hotels. tips: book accommodations in advance for the best rates, explore less crowded beaches like maenam and lamai, and rent a scooter for easy island travel. sunsets at big buddha and dining at fisherman's village are must-do experiences.