Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a comfortable 18.8°C (65.8°F) in August to a moderate 14.6°C (58.3°F). Røyken records a mean low-temperature of 7.2°C (45°F) in September.Humidity
The average relative humidity in September in Røyken, Norway, is 80%.Rainfall
In September, in Røyken, the rain falls for 10.8 days. Throughout September, 35mm (1.38") of precipitation is accumulated. In Røyken, during the entire year, the rain falls for 123.4 days and collects up to 384mm (15.12") of precipitation.Snowfall
June through September are months without snowfall in Røyken.Daylight
In Røyken, the average length of the day in September is 12h and 51min.On the first day of September in Røyken, Norway, sunrise is at 06:15 and sunset at 20:21. On the last day of the month, sunrise is at 07:22 and sunset at 18:53 CEST.
Sunshine
In September, the average sunshine in Røyken, Norway, is 7.8h.UV index
In Røyken, Norway, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 3 in September translates into this advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Frequently asked questions
What is the usual temperature for Røyken in September?
What is the average humidity in September in Røyken?
How many days does it rain in September in Røyken?
When it does not snow in Røyken?
Does it snow in Røyken in September?
How many hours of daylight does Røyken have in September?
When is the sunrise / sunset in September in Røyken?
How long on average sun shines in September in Røyken?
How high is the UV index in September in Røyken?
Average temperature in September
Røyken, Norway
- Average high temperature in September: 14.6°C
The warmest month (with the highest average high temperature) is July (20.3°C).
The month with the lowest average high temperature is January (-2.4°C).
- Average low temperature in September: 7.2°C
The month with the highest average low temperature is July (10.6°C).
The coldest months (with the lowest average low temperature) are January and February (-7.2°C).
Average pressure in September
Røyken, Norway
- Average pressure in September: 1012.6mbar
The month with the highest atmospheric pressure is April (1014.5mbar).
The month with the lowest atmospheric pressure is December (1008mbar).
Average wind speed in September
Røyken, Norway
- Average wind speed in September: 9.6km/h
The windiest months (with the highest average wind speed) are January and December (10.6km/h).
The calmest month (with the lowest average wind speed) is August (8.4km/h).
Average humidity in September
Røyken, Norway
- Average humidity in September: 80%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Røyken, Norway
- Average rainfall in September: 35mm
The wettest months (with the highest rainfall) are July and November (42mm).
The driest month (with the least rainfall) is April (16mm).
Average rainfall days in September
Røyken, Norway
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is July (15.2 days).
The months with the least rainy days are January and February (4.8 days).
Average snowfall in September
Røyken, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is March (113mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Røyken, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Røyken, Norway
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 36min).
The month with the shortest days is December (Average daylight: 6h and 6min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is June (Average sunshine: 11h and 30min).
The months with the least sunshine are January and December (Average sunshine: 3h and 24min).
Average sunshine days in September
Røyken, Norway
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is April (19.1 days).
The month with the least sunshine days is July (13.5 days).
Average UV index in September
Røyken, Norway
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in September
Røyken, Norway
- Average cloud cover in September: 46
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is June (Cloud cover 43).
Average visibility in September
Røyken, Norway
- Average visibility in September: 8km
The months with the highest visibility are April, May, June and July (9km).
The months with the lowest visibility are January, February and March (7km).
Røyken, Norway
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