Planning for the weather is an important factor for making your trip to Rumah Tinggi a success, especially when youโre splurging. The hottest months are usually May and August, with an average temperature of 26ยฐC, while the coldest months are February and January, with an average of 25ยฐC. The rainiest months in Rumah Tinggi are December, November, January and April, with each month seeing an average of 361 mm of rainfall.