Weather is probably a major factor when you plan your trip to Santos, 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 July and August, with an average of 20°C. The rainiest months in Santos are January, February, March and December, with each month seeing an average of 306 mm of rainfall.