April in Sankt Gallen averages a daily high of -0.6°C with nights around -5.1°C. Expect roughly 15.1 wet days totalling 174.9mm. 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. 30 years of April data.