January in Sankt Gallen averages a daily high of -4.2°C with nights around -9.6°C. Expect roughly 15.7 wet days totalling 286.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Sankt Gallen is June–August.
Based on SAENTIS, SZ (19.4km), 1995–2024. 29 years of January data.