The best months to visit Vatican City are May and April. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Vatican City: January 14°C / 63mm; February 16°C / 73mm; March 17°C / 76mm; April 21°C / 79mm; May 23°C / 59mm; June 29°C / 35mm; July 35°C / 23mm; August 34°C / 23mm; September 26°C / 85mm; October 23°C / 120mm; November 17°C / 133mm; December 13°C / 95mm.