Taking the local weather in Slim River into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually March and February, with an average temperature of 26°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in Slim River are November, December, April and October, with each month seeing an average of 382 mm of rainfall.