Lovely, summer-like days that occur around October 18 are called St. Luke’s Little Summer in honor of the saint’s feast day. In olden days, St. Luke’s Day did not receive as much attention in the secular world as St. John’s Day (June 24) and Michaelmas (September 29), so to keep from being forgotten, St. Luke presented us with some golden days to cherish before the coming of winter, or so the story goes. Some folks call this Indian Summer, but that officially occurs between November 11 and November 2
Traditional Catholic Celebrations:
Saint Luke’s Feast Day can be celebrated by reading the Acts of Apostles and praying the three canticles he preserved for us – the Benedictus, the Magnificat and the Nunc Dimittis. As the first Christian physician, Saint Luke is the patron saint of physicians and surgeons. For this reason, we honor Saint Luke on his feast day by praying through his intercession for doctors and those who care for the sick.
Found at: Almanac.com