The best months to visit San Marino are June and May. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in San Marino: January 9°C / 62mm; February 12°C / 72mm; March 14°C / 68mm; April 17°C / 75mm; May 19°C / 72mm; June 25°C / 52mm; July 30°C / 38mm; August 30°C / 50mm; September 22°C / 77mm; October 18°C / 88mm; November 12°C / 97mm; December 8°C / 85mm.