The climate in Oslo during September can be summarized as mild and a little damp.
September is in the fall / autumn in Oslo and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (58°F), whilst at night 7°C (44°F) is normal.
|Daytime temperature||14.5°C 58°F|
|Nightly temperature||6.6°C 43.8°F|
|Average temperature||10.5°C 50.9°F|
|Daily sunshine||5.2 hrs|
|Avg rainfall||94 mm 3.7 ins|
|Rainy days||16 days|
|Sea temperature||15.2°C 59.3°F|
|Windspeed||15.5kph 10 mph|
On average September is the wettest month of the year in Oslo with around 94mm 3.7 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.2 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Oslo in September 2023.
Best places to visit in September
|Hottest month:||July||20.6°C 69.1°F|
|Driest month:||February||41mm 1.6ins|
|Coldest month:||January||-2.1°C 28.2°F|
|Wettest month:||September||94mm 3.7ins|