Weather can make or break a road trip, so we've gathered some data about year-round temperatures in Tanah Merah to help you plan yours. The hottest months are usually November and October, with an average temperature of 26°C, while the coldest months are August and July, with an average of 25°C. The rainiest months in Tanah Merah are March, April, December and November, with each month seeing an average of 508 mm of rainfall.