Hi jma173
Welcome to the forum.
As Marc26 has said,April is probably the hottest month,and very humid.
Its still very busy and Songkran can be good fun. There is occasional rain in April,usually heavy evening showers,but nothing to put off a holiday.
Here is a link to the weather in Patong for the last few years-
www.alexmalcolm.net
Book that holiday, you know you want to
