Dormagen experiences a moderate climate with distinct seasonal variations. Winters are chilly, with temperatures often below freezing, but can occasionally rise above 10°C in February. As spring approaches, temperatures gradually warm up, reaching averages around 12°C by May, which marks the beginning of warmer months. Summers are mild to warm, with July and August averaging around 18-19°C, while autumns bring a slight cooling trend, returning to averages around 6-11°C in November and December.