If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Saint-Leu: The hottest months are usually February and January with an average temp of 77°F, while the coldest months are August and July with an average of 69°F. The rainiest months in Saint-Leu are January, February, March, and December, with each month seeing an average of 10 inches of rainfall.