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
Riddes's weather subtly changes with the onset of September, barely falling from an enjoyable 17°C (62.6°F) in August to a cool 12.7°C (54.9°F). During the nights in September, an average low-temperature of 3.6°C (38.5°F) is observed in Riddes.Humidity
In September, the average relative humidity is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 17.1 days and accumulates 45mm (1.77") of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow. In Riddes, during the entire year, snow falls for 35.6 days and aggregates up to 419mm (16.5") of snow.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 06:52 and sunset at 20:09. On the last day of September, in Riddes, sunrise is at 07:28 and sunset at 19:12 CEST.
Sunshine
In Riddes, the average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September in Riddes is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 3 transforms into these recommendations:
Exercise prevention - Warding off sunburn is urged. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Frequently asked questions
What is the usual temperature for Riddes in September?
What is the average humidity in September in Riddes?
What is the driest month in Riddes?
How many days does it rain in September in Riddes?
When does it start snowing in Riddes?
What is the average length of the day in September in Riddes?
When are sunrise and sunset in September in Riddes?
How long on average sun shines in September in Riddes?
What is the UV index intensity in September in Riddes?
Average temperature in September
Riddes, Switzerland
- Average high temperature in September: 12.7°C
The warmest month (with the highest average high temperature) is August (17°C).
The month with the lowest average high temperature is January (-2.2°C).
- Average low temperature in September: 3.6°C
The months with the highest average low temperature are July and August (6.4°C).
The coldest month (with the lowest average low temperature) is February (-10.8°C).
Average pressure in September
Riddes, Switzerland
- Average pressure in September: 1018.2mbar
The month with the highest atmospheric pressure is December (1021mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).
Average wind speed in September
Riddes, Switzerland
- Average wind speed in September: 6.5km/h
The windiest month (with the highest average wind speed) is December (8.3km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in September
Riddes, Switzerland
- Average humidity in September: 81%
The month with the highest relative humidity is March (90%).
The months with the lowest relative humidity are July, August and October (79%).
Average rainfall in September
Riddes, Switzerland
- Average rainfall in September: 45mm
The wettest month (with the highest rainfall) is May (110mm).
The driest month (with the least rainfall) is September (45mm).
Average rainfall days in September
Riddes, Switzerland
- Average rainfall days in September: 17.1 days
The month with the highest number of rainy days is May (23.3 days).
The month with the least rainy days is January (11.8 days).
Average snowfall in September
Riddes, Switzerland
- Average snowfall in September: 1mm
The month with the highest snowfall is January (110mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Riddes, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Riddes, Switzerland
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 2min
The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in September
Riddes, Switzerland
- Average sunshine days in September: 9.4 days
The month with the most sunshine days is October (15.3 days).
The month with the least sunshine days is May (4.7 days).
Average UV index in September
Riddes, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January and March (UV index 1).
Average cloud cover in September
Riddes, Switzerland
- Average cloud cover in September: 40
The months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is October (Cloud cover 36).
Average visibility in September
Riddes, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are June, July, August, October, November and December (8km).
The months with the lowest visibility are January, February, March, April, May and September (7km).
Riddes, Switzerland
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