September weather forecast and climate
Oslo, Norway

The Vigeland sculpture park in Oslo, Norway, at dusk
The Vigeland sculpture park in Oslo, Norway, at dusk
September, the first month of the autumn, in Oslo, is also a moderate month, 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 decreases, from an agreeable 20.1°C (68.2°F) in August, to a mild 15.1°C (59.2°F). The average low-temperature, in Oslo, is 7.5°C (45.5°F).

Rainfall

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

Sea temperature

In Oslo, Norway, the average water temperature is 15.4°C (59.7°F).
Note: Swimming in 15.4°C (59.7°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

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

Sunshine

The average sunshine in September is 4.8h.

UV index

In Oslo, Norway, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for the average 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 solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in September in Oslo?

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

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 wettest month in Oslo?

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

What is the sea temperature in September in Oslo?

In Oslo, Norway, 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).

What is the average length of the day in September in Oslo?

In Oslo, Norway, the average length of the day in September 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 value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.
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: 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: 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).

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: 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).

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).