Planning for the weather is a good way to make your trip to Bandar Seri Begawan relaxing and enjoyable, especially when you’re splurging. The hottest months are usually May and June, with an average temperature of 28°C, while the coldest months are February and January, with an average of 27°C. The rainiest months in Bandar Seri Begawan are December, November, October and January, with each month seeing an average of 301 mm of rainfall.