If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Lom Sak: The hottest months are usually April and March, with an average temperature of 28°C, while the coldest months are December and January, with an average of 24°C. The rainiest months in Lom Sak are August, July, May and September, with each month seeing an average of 450 mm of rainfall.