September weather forecast
Oslo, Norway

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The Vigeland sculpture park in Oslo, Norway, at dusk
The Vigeland sculpture park in Oslo, Norway, at dusk

Weather in September

With the arrival of September, temperatures start to recede, signifying the onset of autumn. Despite sea temperatures cooling down to 15.4°C (59.7°F), the Oslo harbor remains a bustling hotspot. The unexpected vibrancy of autumn foliage enhances the cityscape, offering spectacular views from lookout points like the Holmenkollen Ski Jump. September's serene climate underpins the settling down of the city after the summer rush.

Temperature

The transition into September involves a decrease in the average high-temperature, falling from a pleasant 20.1°C (68.2°F) in August to a moderate 15.1°C (59.2°F). Oslo throughout September, records an average low-temperature of 7.5°C (45.5°F).

Rainfall

September is the month with the most rainfall in Oslo, Norway. Rain falls for 7 days and accumulates 90mm (3.54") of precipitation.

Sea temperature

In Oslo, the average seawater temperature in September is 15.4°C (59.7°F).
Note: The majority of people find swimming in 15.4°C (59.7°F) unenjoyable. As the water temperature decreases from 21°C (69.8°F) to 15°C (59°F), breathing becomes more challenging to control.

Daylight

In Oslo, Norway, the average length of the day in September is 12h and 52min.
On the first day of the month, sunrise is at 06:13 and sunset at 20:20. On the last day of September, in Oslo, sunrise is at 07:21 and sunset at 18:52 CEST.

Sunshine

In September, the average sunshine in Oslo, Norway, is 4.8h.

UV index

In September, the average daily maximum UV index in Oslo is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.
Note: A daily high UV index of 3 in September leads to these guidelines:
Be vigilant - Suggestions to stave off sun damage are provided. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.

Frequently asked questions

What is the temperature in September in Oslo?

In Oslo, 15.1°C (59.2°F) is the average high-temperature and 7.5°C (45.5°F) is the average low-temperature during September.

What is the wettest month in Oslo?

The month with the most rainfall is September, when the rain falls for 7 days and typically aggregates up to 90mm (3.54") of precipitation.

How many days does it rain in September in Oslo?

In Oslo, Norway, during September, the rain falls for 7 days and regularly aggregates up to 90mm (3.54") of precipitation.

What is the sea water temperature in September in Oslo?

In Oslo, the average seawater temperature in September is 15.4°C (59.7°F). For swimming, a surface water temperature of 15.4°C (59.7°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Oslo have in September?

The average day length in September in Oslo, Norway, is 12h and 52min.

When are sunrise and sunset in September in Oslo?

On the first day of September in Oslo, Norway, sunrise is at 06:13 and sunset at 20:20. On the last day of the month, sunrise is at 07:21 and sunset at 18:52 CEST.

How long on average sun shines in September in Oslo?

The average sunshine duration in September in Oslo is 4.8h.

What is the UV index reading in September in Oslo?

In Oslo, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Oslo, Norway

Average temperature in September - Oslo, Norway
  • Average high temperature in September: 15.1°C

The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is January (-1.8°C).

  • Average low temperature in September: 7.5°C

The month with the highest average low temperature is July (12.2°C).
The coldest months (with the lowest average low temperature) are January and February (-6.8°C).

Average rainfall in September
Oslo, Norway

Average rainfall in September - Oslo, Norway
  • Average rainfall in September: 90mm

The wettest month (with the highest rainfall) is September (90mm).
The driest month (with the least rainfall) is February (36mm).

Average rainfall days in September
Oslo, Norway

Average rainfall days in September - Oslo, Norway
  • Average rainfall days in September: 7 days

The months with the highest number of rainy days are August, October and November (8 days).
The month with the least rainy days is February (4 days).

Average sea temperature in September
Oslo, Norway

Average sea temperature in September - Oslo, Norway
  • Average sea temperature in September: 15.4°C

The best month for swimming (with the highest average sea temperature) is August (17.9°C).
The coldest month (with the lowest average sea temperature) is March (3°C).

Average daylight in September /
Average sunshine in September
Oslo, Norway

Average daylight in September / Average sunshine in September - Oslo, Norway
  • Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 18h and 42min).
The month with the shortest days is December (Average daylight: 6h and 6min).

  • Average sunshine in September: 4h and 5min

The month with the most sunshine is June (Average sunshine: 8h and 18min).
The month with the least sunshine is December (Average sunshine: 1h and 6min).

Average UV index in September
Oslo, Norway

Average UV index in September - Oslo, Norway
  • Average UV index in September: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 0).

Oslo, Norway

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