If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Hialeah Gardens: The hottest months are usually August and July with an average temp of 84°F, while the coldest months are January and February with an average of 71°F. The rainiest months in Hialeah Gardens are September, June, August, and July, with each month seeing an average of 7 inches of rainfall.