Planning for the weather is an important factor for making your trip to Rumah Gadong a success, especially when youโre splurging. The hottest months are usually May and August, with an average temperature of 27ยฐC, while the coldest months are February and March, with an average of 26ยฐC. The rainiest months in Rumah Gadong are November, December, January and October, with each month seeing an average of 368 mm of rainfall.