September in Asker averages a daily high of 16.1°C with nights around 8.6°C. Expect roughly 11.7 wet days totalling 101.3mm. 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 September data.