Weather will likely play an important role when you plan your trip to Sitiawan, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and June, with an average temperature of 28°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Sitiawan are November, December, October and March, with each month seeing an average of 315 mm of rainfall.