August in Västerås averages a daily high of 21.8°C with nights around 12.4°C. Expect roughly 12.7 wet days totalling 75.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Västerås is June–September.
Based on VASTERAS HASSLO, SW (5.2km), 1995–2024. 27 years of August data.