If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Ban Laem: The hottest months are usually April and May with an average temp of 85°F, while the coldest months are December and January with an average of 80°F. The rainiest months in Ban Laem are September, October, May, and July, with each month seeing an average of 8 inches of rainfall.