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NorwayThe weather in September in Oslo
It's cool to moderate in September in Oslo with an average temperature of 16°C. Temperatures this month range from a low of 12°C to a high of 18°C. At night, you can expect temperatures between 6°C and 9°C.
Looking for sun and warm weather? September isn’t a good month to be in Oslo. The temperatures are too low for a warm stay this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Oslo, Norway. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 26°C in 2021, Oslo reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 6°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of -3°C to a highest value of 17°C.
Water temperature
The water temperature at Oslo is 19°C this month. Refreshing if you feel like a swim.
Rainfall amount
In September, there is an average of 140 mm of precipitation, spread over 16 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Oslo
Click on any day in September to get detailed info about the usual weather on that day in Oslo. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Oslo | New York | |
|---|---|---|
| Average temperature | 16°C | 27°C |
| Max. temperature | 18°C | 31°C |
| Min. temperature | 6°C | -5°C |
| Total precipitation | 140 mm | 57 mm |
| Rainy days | 16 days | 9 days |
Start of September
The month of September starts in Oslo with mild temps, averaging around 18°C during the day and nights around 9°C.
Mid September
By mid-September, daytime temps drop to around 16°C, with nights around 8°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Oslo is around 14°C, while nighttime temps are about 7°C. There’s a significant chance of many days with precipitation.
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Oslo for all months and discover the best travel time
Curious about the weather in other parts of Norway? Check out the climate and weather for spots like Lofoten, Vesterålen, Bergen, or explore other destinations in Norway.
Temperature charts
These charts show the average temperatures in September in Oslo, Norway. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Oslo
Temperature in September in Oslo over the years
Precipitation charts
These charts show the average amount of precipitation in September in Oslo, Norway. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Oslo
Total precipitation in September in Oslo over the years
Daily UV index in September in Oslo
This chart shows the average daily UV index in September in Oslo, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Oslo
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Average weather in Oslo by month
Click on a month below to see detailed weather info for Oslo. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.