Taking the local weather in Karimun Jawa into account can help you maximise your time at the pool during your trip. The hottest months are usually April and May, with an average temperature of 28°C, while the coldest months are August and July, with an average of 27°C. The rainiest months in Karimun Jawa are January, December, February and March, with each month seeing an average of 390 mm of rainfall.