The temperatures are highest on average in July, at around , and lowest in January, at around . The highest temperature ever recorded in Saint-Martin-de-Londres was  on 1 August 1947; the coldest temperature ever recorded was  on 4 February 1963.
Temperatures peak in Saint-Martin-de-Londres during July, reaching approximately , while dropping to around in January. The record high of  was set on August 1, 1947, and the record low of  occurred on February 4, 1963.