April in Västerås averages a daily high of 11.2°C with nights around 1°C. Expect roughly 9 wet days totalling 31.5mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Västerås is June–September.
Based on VASTERAS HASSLO, SW (5.2km), 1995–2024. 27 years of April data.