August in Marl averages a daily high of 23.9°C with nights around 12.9°C. Expect roughly 14.3 wet days totalling 89.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Marl is May–September.
Based on BOCHUM, GM (23.2km), 1995–2024. 13 years of August data.