Saint-Louis is the fifth-largest commune in the French overseas department of Réunion. It is located on the southwest part of the isla…Saint-Louis is the fifth-largest commune in the French overseas department of Réunion. It is located on the southwest part of the island of Réunion, adjacent to Saint-Pierre. Saint-Louis has a tropical savanna climate. The average annual temperature in Saint-Louis is 22.2 °C. The average annual rainfall is 1,161.6 mm with January as the wettest month. The temperatures are highest on average in February, at around 25.2 °C, and lowest in July, at around 19.0 °C. The highest temperature ever recorded in Saint-Louis was 34.6 °C on 11 February 2016; the coldest temperature ever recorded was 10.4 °C on 10 August 2020.