The best months to visit Poland are September and August. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Poland: January 2°C / 41mm; February 9°C / 38mm; March 11°C / 43mm; April 16°C / 46mm; May 23°C / 69mm; June 25°C / 70mm; July 27°C / 84mm; August 26°C / 66mm; September 23°C / 58mm; October 14°C / 46mm; November 7°C / 41mm; December 5°C / 44mm.