Planning for the weather is an important factor for making your trip to Tomohon a success, especially when you're splurging. The hottest months are usually September and October, with an average temperature of 27°C, while the coldest months are February and March, with an average of 26°C. The rainiest months in Tomohon are January, May, December and November, with each month seeing an average of 319 mm of rainfall.