His youth was spent in Le Havre, where he first excelled as a caricaturist but was then converted to landscape painting by his early mentor Boudin, from whom he derived his firm predilection for painting out of doors. In 1859 he studied in Paris at the Atelier Suisse and formed a friendship with Pissarro. After two years' military service in Algiers, he returned to Le Havre and met Jongkind, to whom he said he owed `the definitive education of my eye'. He then, in 1862, entered the studio of Gleyre in Paris and there met Renoir, Sisley, and Bazille, with whom he was to form the nucleus of the Impressionist group. Monet's devotion to painting out of doors is illustrated by the famous story concerning one of his most ambitious early works, Women in the Garden (Musée d'Orsay, Paris; 1866-67). The picture is about 2.5 meters high and to enable him to paint all of it outside he had a trench dug in the garden so that the canvas could be raised or lowered by pulleys to the height he required. Courbet visited him when he was working on it and said Monet would not paint even the leaves in the background unless the lighting conditions were exactly right.

In his final years he was troubled by failing eyesight, but he painted until the end. He was enormously prolific and many major galleries have examples of his work.