Visiting local bars in Rabaul is more fun when the weather is good. These rainfall averages and temperatures can help you decide the best time for bar-hopping. The hottest months are usually May and October, with an average temperature of 27°C, while the coldest months are August and September, with an average of 27°C. The rainiest months in Rabaul are March, April, December and February, with each month seeing an average of 415 mm of rainfall.