May in Asker averages a daily high of 15.8°C with nights around 6°C. Expect roughly 12.4 wet days totalling 79.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Asker is June–August.
Based on ASKER, NO (2.5km), 1995–2024. 30 years of May data.