January in Norwalk averages a daily high of 4°C with nights around -5.7°C. Expect roughly 10.8 wet days totalling 98.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Norwalk is August–October.
Based on STAMFORD 5 N, CT US (11.7km), 1995–2024. 20 years of January data.