temperature in oslo in september
Averages for Oslo in September Averages for Oslo in September. 1  It is the beginning of autumn in September, and Oslo begins to experience a dramatic transformation as the changing of the seasons brings with it an innate beauty of colors. Temperatures in September drop to a low of 8Â°C (46Â°F). Visitors should experience about 5 hours of sunshine everyday, and about 81mm of average rainfall. Although the weather may not be appealing, it is the perfect opportunity to photograph some of ...