January in Basel averages a daily high of 5.3°C with nights around -0.3°C. Expect roughly 12.7 wet days totalling 49.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Basel is June–September.
Based on BASEL BINNINGEN, SZ (2.9km), 1995–2024. 29 years of January data.