The best time to visit Ko Phi Phi is during the dry season from November to April, when the weather is warm, dry, and perfect for beach activities. Temperatures range between 27°C and 33°C (80°F to 91°F), with clear skies and calm seas, making it ideal for snorkeling, diving, and island-hopping. While this is the busiest time of the year, with more tourists and higher prices, it's worth it for the great weather and lively atmosphere.
May to October is the monsoon season, with frequent rains and rougher seas, making boat trips less predictable. However, if you prefer fewer crowds and lower accommodation prices, this is a good time to visit. Just be prepared for afternoon downpours, and check the weather forecast before planning outdoor activities. The lush greenery and quieter beaches during this season offer a different but equally beautiful experience of Ko Phi Phi.