If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Phitsanulok: The hottest months are usually April and March, with an average temperature of 30°C, while the coldest months are December and January, with an average of 26°C. The rainiest months in Phitsanulok are August, September, July and June, with each month seeing an average of 325 mm of rainfall.