Planning for the weather is a good way to make your trip to Klang relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 82°F, while the coldest months are January and February with an average of 80°F. The rainiest months in Klang are November, December, April, and October, with each month seeing an average of 11 inches of rainfall.