Lisbon in October is a great month to visit the Portuguese capital. The climate is mild, and the temperatures are lovely. Hot days are gone, but there might be a rainy day here and there. October in Lisbon has fewer crowds than the busy summer months, and it's a much-loved destination for an autumn break. The prices of hotels also tend to drop. There are many events, such as the Lisbon Marathon and the Film Festival. Reason enough to visit this beautiful city!