Planning for the weather is a good way to make your trip to Saint-Denis relaxing and enjoyable, especially when you’re splurging. The hottest months are usually February and January, with an average temperature of 26°C, while the coldest months are August and July, with an average of 21°C. The rainiest months in Saint-Denis are January, February, March and December, with each month seeing an average of 272 mm of rainfall.