Weather is probably a major factor when you plan your trip to Araruama, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January, with an average temperature of 25°C, while the coldest months are August and July, with an average of 21°C. The rainiest months in Araruama are November, December, January and March, with each month seeing an average of 192 mm of rainfall.