Weather in September
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?
What is the wettest month in Oslo?
How many days does it rain in September in Oslo?
What is the sea water temperature in September in Oslo?
How many hours of daylight does Oslo have in September?
When are sunrise and sunset in September in Oslo?
How long on average sun shines in September in Oslo?
What is the UV index reading in September in Oslo?
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
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: 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: 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: 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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