September weather forecastRiska, Norway
September
Weather in September
September, the first month of the autumn in Riska, is also a moderate month, with an average temperature fluctuating between 12.2°C (54°F) and 14.4°C (57.9°F).Temperature
The transition from August to September brings an average high-temperature of a moderate 14.4°C (57.9°F), barely different from August's 16.3°C (61.3°F). September nights experience a minor temperature downturn to a cool 12.2°C (54°F).Humidity
In Riska, the average relative humidity in September is 79%.Rainfall
In Riska, in September, during 19.1 rainfall days, 101mm (3.98") of precipitation is typically accumulated. Throughout the year, there are 210.4 rainfall days, and 1002mm (39.45") of precipitation is accumulated.Snowfall
May through October are months without snowfall in Riska.Daylight
In Riska, the average length of the day in September is 12h and 50min.On the first day of September in Riska, sunrise is at 06:35 and sunset at 20:37. On the last day of the month, sunrise is at 07:40 and sunset at 19:12 CEST.
Sunshine
In Riska, the average sunshine in September is 6.8h.UV index
In Riska, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the UV index of 3 transforms into the following advice:
Undertake protective steps - Preventing sun damage is advised. When the Sun is at its strongest around midday, find shade and limit exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Riska, Norway
- Average high temperature in September: 14.4°C
The warmest month (with the highest average high temperature) is August (16.3°C).
The month with the lowest average high temperature is February (3.7°C).
- Average low temperature in September: 12.2°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (1.6°C).
Average pressure in September
Riska, Norway
- Average pressure in September: 1012.6mbar
The month with the highest atmospheric pressure is May (1015mbar).
The month with the lowest atmospheric pressure is December (1006.7mbar).
Average wind speed in September
Riska, Norway
- Average wind speed in September: 20.7km/h
The windiest month (with the highest average wind speed) is January (27.4km/h).
The calmest months (with the lowest average wind speed) are June and July (17.2km/h).
Average humidity in September
Riska, Norway
- Average humidity in September: 79%
The month with the highest relative humidity is July (81%).
The months with the lowest relative humidity are October and November (76%).
Average rainfall in September
Riska, Norway
- Average rainfall in September: 101mm
The wettest month (with the highest rainfall) is December (130mm).
The driest month (with the least rainfall) is June (43mm).
Average rainfall days in September
Riska, Norway
- Average rainfall days in September: 19.1 days
The month with the highest number of rainy days is December (21.5 days).
The month with the least rainy days is June (13.3 days).
Average snowfall in September
Riska, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is March (30mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Riska, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Riska, Norway
- Average daylight in September: 12h and 48min
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 48min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in September
Riska, Norway
- Average sunshine days in September: 9.4 days
The month with the most sunshine days is June (14.4 days).
The month with the least sunshine days is December (5.8 days).
Average UV index in September
Riska, Norway
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (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
Riska, Norway
- Average cloud cover in September: 52
The month with the most cloud cover is December (Cloud cover 64).
The month with the least cloud cover is May (Cloud cover 44).
Average visibility in September
Riska, Norway
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, October, November and December (9km).
