The best months to visit Slovakia are September and May. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Slovakia: January 3°C / 35mm; February 6°C / 33mm; March 10°C / 42mm; April 16°C / 44mm; May 20°C / 69mm; June 24°C / 74mm; July 26°C / 76mm; August 26°C / 67mm; September 21°C / 67mm; October 15°C / 49mm; November 9°C / 46mm; December 4°C / 40mm.