If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Santa María Tonameca: The hottest months are usually April and March, with an average temperature of 26°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in Santa María Tonameca are September, June, August and October, with each month seeing an average of 505 mm of rainfall.