Taking into account the local weather in Oberndorf an der Melk can help you maximize your time at the pool during your trip. The hottest months are usually July and August with an average temp of 60°F, while the coldest months are January and February with an average of 31°F. The rainiest months in Oberndorf an der Melk are May, July, June, and August, with each month seeing an average of 7 inches of rainfall.