January in Dundalk averages a daily high of 6.6°C with nights around -0.7°C. Expect roughly 10 wet days totalling 73.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Dundalk is April–May.
Based on MARYLAND SCIENCE CENTER, MD US (8.5km), 1995–2024. 23 years of January data.