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
September
Weather in September
Temperature
Upon the onset of September, Risa witnesses an average high-temperature of a moderate 14.5°C (58.1°F), showing a close resemblance to the prior month. Risa maintains a near steady average temperature of 12.3°C (54.1°F) during the nights of September, demonstrating little drop from daytime highs.Humidity
In September, the average relative humidity in Risa is 79%.Rainfall
In Risa, Norway, in September, during 15.2 rainfall days, 59mm (2.32") of precipitation is typically accumulated. Throughout the year, there are 180.8 rainfall days, and 668mm (26.3") of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Risa, the average length of the day in September is 12h and 49min.On the first day of September in Risa, sunrise is at 06:36 and sunset at 20:37. On the last day of the month, sunrise is at 07:40 and sunset at 19:13 CEST.
Sunshine
In September, the average sunshine in Risa is 6.5h.UV index
The months with the highest UV index in Risa are May through September, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, an average UV index of 4 transforms into the following instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Risa?
What is the average humidity in September in Risa?
How much does it rain in Risa in September?
When it does not snow in Risa?
What is the average length of the day in September in Risa?
When is the sunrise / sunset in September in Risa?
How many hours of sunshine does Risa have in September?
What is the month with the highest UV index in Risa?
What is the UV index intensity in September in Risa?
Average temperature in September
Risa, Norway
- Average high temperature in September: 14.5°C
The warmest month (with the highest average high temperature) is August (16.5°C).
The month with the lowest average high temperature is February (3.9°C).
- Average low temperature in September: 12.3°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (1.9°C).
Average pressure in September
Risa, Norway
- Average pressure in September: 1012.7mbar
The month with the highest atmospheric pressure is May (1015mbar).
The month with the lowest atmospheric pressure is December (1006.8mbar).
Average wind speed in September
Risa, Norway
- Average wind speed in September: 23.1km/h
The windiest month (with the highest average wind speed) is January (30km/h).
The calmest month (with the lowest average wind speed) is July (19.7km/h).
Average humidity in September
Risa, Norway
- Average humidity in September: 79%
The month with the highest relative humidity is July (82%).
The months with the lowest relative humidity are April, October and November (77%).
Average rainfall in September
Risa, Norway
- Average rainfall in September: 59mm
The wettest months (with the highest rainfall) are October and December (73mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Risa, Norway
- Average rainfall days in September: 15.2 days
The month with the highest number of rainy days is August (18.4 days).
The month with the least rainy days is February (12.3 days).
Average snowfall in September
Risa, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is December (31mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Risa, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Risa, Norway
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 18min).
The month with the shortest days is December (Average daylight: 6h and 24min).
- Average sunshine in September: 6h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 2h and 24min).
Average sunshine days in September
Risa, Norway
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is May (15.7 days).
The month with the least sunshine days is December (9.6 days).
Average UV index in September
Risa, Norway
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Risa, Norway
- Average cloud cover in September: 53
The month with the most cloud cover is December (Cloud cover 65).
The months with the least cloud cover are May and June (Cloud cover 45).
Average visibility in September
Risa, Norway
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, November and December (9km).
