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 My Tho: The hottest months are usually April and March, with an average temperature of 28°C, while the coldest months are January and December, with an average of 27°C. The rainiest months in My Tho are October, September, July and August, with each month seeing an average of 289 mm of rainfall.