Planning for the weather is an important factor for making your trip to Lam Kaen a success, especially when you’re splurging. The hottest months are usually March and April with an average temp of 81°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Lam Kaen are September, October, July, and August, with each month seeing an average of 15 inches of rainfall.