Weather is probably a major factor when you plan your trip to Tailandia, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and September with an average temp of 83°F, while the coldest months are January and February with an average of 78°F. The rainiest months in Tailandia are March, April, February, and May, with each month seeing an average of 20 inches of rainfall.