Weather will likely play an important role when you plan your trip to Watthana Nakhon, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April, with an average temperature of 29°C, while the coldest months are December and January, with an average of 26°C. The rainiest months in Watthana Nakhon are September, October, August and July, with each month seeing an average of 230 mm of rainfall.