Düsseldorf in March

April through September gives you the best weather and longest days. The Rhine promenade comes alive with outdoor cafes and beer gardens. May and June are ideal. Temperatures hit 20-25°C, perfect for walking Königsallee or exploring the Japanese quarter. The city's gardens bloom, and outdoor events kick off. Summer (July-August) gets busy with tourists and business travelers. Hotel prices spike, but the Rhine beaches open and rooftop bars extend their hours. Expect occasional rain showers. September brings fashion week and art fair season. The city buzzes with industry events, but book accommodations early. Weather stays mild through October. Winter isn't terrible – Christmas markets pop up in November and December. But the Rhine gets gray and windy. Indoor attractions like the Kunstsammlung museums become more appealing. Avoid major trade fair periods (varies by year) when hotel prices double and restaurants get packed with business groups.