If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Song Phi Nong: The hottest months are usually April and May with an average temp of 84°F, while the coldest months are January and December with an average of 79°F. The rainiest months in Song Phi Nong are September, October, July, and August, with each month seeing an average of 8 inches of rainfall.