If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Tarlac: The hottest months are usually April and May with an average temp of 83°F, while the coldest months are January and February with an average of 78°F. The rainiest months in Tarlac are July, September, August, and June, with each month seeing an average of 13 inches of rainfall.