Planning for the weather is an important factor for making your trip to Ayer Keroh a success, especially when you're splurging. The hottest months are usually March and April with an average temp of 81°F, while the coldest months are January and February with an average of 80°F. The rainiest months in Ayer Keroh are November, December, October, and May, with each month seeing an average of 10 inches of rainfall.