September weather forecast
Oslo, Norway

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

Weather in September

The first month of the autumn, September, is also a moderate month in Oslo, Norway, with average temperature varying between 7.5°C (45.5°F) and 15.1°C (59.2°F).

Temperature

In Oslo, Norway, the average high-temperature in September decreases, from a pleasant 20.1°C (68.2°F) in August, to a mild 15.1°C (59.2°F). In Oslo, in September, the average low-temperature is 7.5°C (45.5°F).

Rainfall

September is the month with the most rainfall in Oslo. 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: 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).

Daylight

The average length of the day in Oslo is 12.8h.

Sunshine

The average sunshine in September is 4.8h.

UV index

In Oslo, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

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 much does it rain in Oslo in September?

In Oslo, Norway, in September, during 7 rainfall days, 90mm (3.54") of precipitation is typically accumulated.

What is the sea temperature in September in Oslo?

In Oslo, in September, the average water temperature is 15.4°C (59.7°F). For most, swimming in 15.4°C (59.7°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

How many hours of daylight does Oslo have in September?

The average length of the day in September in Oslo is 12.8h.

How many hours of sunshine does Oslo have in September?

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

What is the UV index intensity in September in Oslo?

In Oslo, Norway, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

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).

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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).

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Average rainfall days in September
Oslo, Norway

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

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).

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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).

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

Average daylight in September / Average sunshine in September - Oslo, Norway
  • Average daylight in September: 12.8h

The month with the longest days is June (Average daylight: 18.7h).
The month with the shortest days is December (Average daylight: 6.1h).

  • Average sunshine in September: 4.8h

The month with the most sunshine is June (Average sunshine: 8.3h).
The month with the least sunshine is December (Average sunshine: 1.1h).

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Average UV index in September
Oslo, Norway

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

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

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