Weather is probably a major factor when you plan your trip to Guarujá, 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 26°C, while the coldest months are July and August, with an average of 21°C. The rainiest months in Guarujá are January, February, March and December, with each month seeing an average of 307 mm of rainfall.