DembeniDembeni is a commune in the French overseas department of Mayotte, in the Indian Ocean.WWW Official SiteGeographyClimateDembeni has a tropical savanna climate. The average annual temperature in Dembeni is. The average annual rainfall is with January as the wettest month. The temperatures are highest on average in March, at around, and lowest in August, at around. The highest temperature ever recorded in Dembeni was on 17 November 2011; the coldest temperature ever recorded was on 4 December 2002.Demographics'''Demographic evolution of Dembeni'''