Other facts from our historical weather data: Which months have the greatest rainfall in Ko Pha-ngan? Most rainfall (rainy season) is seen in May, September, October and November. Which is the hottest month in Ko Pha-ngan? May has an average maximum temperature of 31°C (88°F) and is the hottest month of the year. Which is the coolest month in Ko Pha-ngan? The coolest month is January with an average maximum temperature of 29°C (84°F). Which is the wettest month in Ko Pha-ngan? October tops the wettest month list with 319mm (12.6 in) of rainfall. Which is the driest month in Ko Pha-ngan? February is the driest month with 44mm (1.7 in) of precipitation. Which is the sunniest month in Ko Pha-ngan? March is the sunniest month with an average of 240 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.