May in Dundalk averages a daily high of 24.4°C with nights around 15.1°C. Expect roughly 11.3 wet days totalling 89mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Dundalk is April–May.
Based on MARYLAND SCIENCE CENTER, MD US (8.5km), 1995–2024. 24 years of May data.