Weather is probably a major factor when you plan your trip to São Tomé Island, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April, with an average temperature of 28°C, while the coldest months are July and August, with an average of 25°C. The rainiest months in São Tomé Island are November, October, December and April, with each month seeing an average of 249 mm of rainfall.