Oslo
Norway
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Oslo, Norway

The scenic view of the Vigeland sculpture park in Oslo, Norway, at dusk
The scenic view of the Vigeland sculpture park in Oslo, Norway, at dusk
September, the first month of the autumn, in Oslo, is still a mild month, with average temperature varying between 15.1°C (59.2°F) and 7.5°C (45.5°F).

Temperature

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

Rainfall

September is the month with the most rainfall. Rain falls for 7 days and accumulates 90mm (3.5") of precipitation.

Sea temperature

In Oslo, the average seawater temperature in September is 15.4°C (59.7°F). 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 is 12.8h.

Sunshine

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

UV index

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

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 many days does it rain in September in Oslo?

In September, in Oslo, Norway, the rain falls for 7 days. Throughout September, 90mm (3.5") of precipitation is accumulated.

What is the wettest month in Oslo?

The month with the most rainfall in Oslo, Norway, is September when the rain falls for 7 days and typically aggregates up to 90mm (3.5") of precipitation.

How cold is the water in September in Oslo?

In Oslo, in September, the average water temperature 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).

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

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 is 4.8h.

What is the UV index reading in September in Oslo?

In Oslo, Norway, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's 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).
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 lowest 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 lowest number of 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 shortest days is December (Average daylight: 6.1h).

  • Average sunshine in September: 4.8h

The month with most sunshine is June (Average sunshine: 8.3h).
The month with 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).