One of the paintings - part of the famous Nympheas (Water Lilies) series - has not been seen in public since 1945.
It is expected to sell for an estimated $30-45m (£20.5m-£13m) when it goes under the hammer on 5 May.
The six works, which have been held in private collections, are expected to raise in excess of $78m (£53.5m).
The other works are Le Palais Ducal painted in 1908 in Venice; Bassin aux nympheas, les rosiers (1913); Le Chemin d'Epinay, effet de neige (1875); La Seine a Vetheuil (1901), and Au Val Saint-Nicolas pres Dieppe, matin (1897).
The impressionist's works will be on show in London until 14 April, before returning to New York where they will be on view from 1 May.
Six oil paintings by impressionist master Claude Monet have gone on display in London ahead of their auction in New York.