Visiting local bars in Sibu Island is more fun in good weather. These rainfall averages and temperatures can help you choose the best time for bar hopping. The hottest months are usually May and June with an average temp of 82°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Sibu Island are December, November, January, and October, with each month seeing an average of 15 inches of rainfall.