September in Sollentuna averages a daily high of 17.1°C with nights around 8.9°C. Expect roughly 11.7 wet days totalling 57.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sollentuna is June–August.
Based on STOCKHOLM BROMMA, SW (8.3km), 1995–2024. 30 years of September data.