When you’re planning your getaway to Sumbawa Besar, year-round temperatures and rainfall may be important factors to consider. The hottest months are usually October and November, with an average temperature of 27°C, while the coldest months are August and July, with an average of 26°C. The rainiest months in Sumbawa Besar are January, February, December and March, with each month seeing an average of 253 mm of rainfall.