January in St. Catharines averages a daily high of 0.6°C with nights around -5°C. Expect roughly 10.5 wet days totalling 36.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit St. Catharines is June–September.
Based on PORT WELLER AUT, ON CA (9km), 1995–2024. 28 years of January data.