May in Lahr averages a daily high of 20.7°C with nights around 9.3°C. Expect roughly 14.1 wet days totalling 96.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lahr is May–September.
Based on LAHR, GM (4.1km), 1995–2024. 30 years of May data.