If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Bang Lamung: The hottest months are usually May and April with an average temp of 84°F, while the coldest months are December and January with an average of 81°F. The rainiest months in Bang Lamung are September, October, July, and August, with each month seeing an average of 10 inches of rainfall.