If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Megamendung: The hottest months are usually September and October, with an average temperature of 23°C, while the coldest months are July and August, with an average of 22°C. The rainiest months in Megamendung are November, April, December and March, with each month seeing an average of 463 mm of rainfall.