May in Speyer averages a daily high of 21.4°C with nights around 9.9°C. Expect roughly 12.3 wet days totalling 69.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Speyer is May–September.
Based on WAGHAUSEL KIRRLACH, GM (11.4km), 1995–2024. 30 years of May data.