January in Waterloo averages a daily high of -2.2°C with nights around -9.2°C. Expect roughly 12.4 wet days totalling 72.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Waterloo is May–September.
Based on ROSEVILLE, ON CA (13.6km), 1995–2024. 28 years of January data.