The dry winter season (May to October) is the most pleasant time to visit Namibia. During this period you can expect warm, sunny days and cold nights, often with temperatures falling below freezing. It’s best to avoid Namib-Naukluft Park and Etosha National Park in the extreme heat (December to March), and Fish River Canyon is closed to the public between December and April. The northeastern rivers may flood during this time too, making some roads either impassable or hard to negotiate. Resort areas are busiest during both Namibian and South African school holidays - usually from mid-December to mid-January, late-April to early June, and late-August to mid-September.