April in Sơn La averages a daily high of 30.1°C with nights around 18.3°C. Expect roughly 10 wet days totalling 107mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sơn La is October–March.
Based on SON LA, VM (2.1km), 1995–2024. 18 years of April data.