If you're looking forward to lots of outings with your partner, check out these details about year-round temperatures in Tonalá: The hottest months are usually April and March with an average temp of 80°F, while the coldest months are January and February with an average of 76°F. The rainiest months in Tonalá are June, September, August, and July, with each month seeing an average of 12 inches of rainfall.