The best months to visit Denmark are May and September. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Denmark: January 3°C / 50mm; February 6°C / 42mm; March 8°C / 43mm; April 11°C / 41mm; May 18°C / 52mm; June 18°C / 73mm; July 19°C / 72mm; August 21°C / 76mm; September 18°C / 58mm; October 13°C / 61mm; November 8°C / 50mm; December 7°C / 54mm.