The Danish climate is moderated by the warm Gulf Stream and is therefore milder than surrounding Scandinavian countries. The spring months, April to May, are the mildest, while the summer months of June, July and August are the hottest. The best time to visit Rodskilde, Copenhagen as well as other Scandinavian cities, Copenhagen is in spring and ummer, especially in May, June and September with the warm weather and long daylight hours.
Find the latest weather forecasts for Denmark at the https://www.dmi.dk/