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
Arolla's September weather shows a modest shift in high-temperatures, falling from August's mild 14.4°C (57.9°F) to a cool 10.4°C (50.7°F). Arolla experiences an average low-temperature reading of 2.2°C (36°F) throughout September.Humidity
In Arolla, the average relative humidity in September is 83%.Rainfall
In September, in Arolla, the rain falls for 15.4 days. Throughout September, 62mm (2.44") of precipitation is accumulated. In Arolla, during the entire year, the rain falls for 138.3 days and collects up to 1170mm (46.06") of precipitation.Snowfall
January through December are months with snowfall in Arolla. In September, it is snowing for 6.7 days. Throughout September, 183mm (7.2") of snow is accumulated. In Arolla, during the entire year, snow falls for 168.8 days and aggregates up to 6180mm (243.31") of snow.Daylight
In Arolla, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 06:51 and sunset at 20:08. On the last day of the month, sunrise is at 07:27 and sunset at 19:11 CEST.
Sunshine
In Arolla, Switzerland, the average sunshine in September is 8h.UV index
The average daily maximum UV index in September in Arolla, Switzerland, is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 2 in September converts into the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Frequently asked questions
What is the temperature in September in Arolla?
What is the average humidity in September in Arolla?
How many days does it rain in September in Arolla?
How many days does it snow in September in Arolla?
What is the average length of the day in September in Arolla?
When are sunrise and sunset in September in Arolla?
How many hours of sunshine does Arolla have in September?
What is the UV index reading in September in Arolla?
Average temperature in September
Arolla, Switzerland
- Average high temperature in September: 10.4°C
The warmest months (with the highest average high temperature) are July and August (14.4°C).
The month with the lowest average high temperature is January (-4.2°C).
- Average low temperature in September: 2.2°C
The month with the highest average low temperature is August (4.7°C).
The coldest month (with the lowest average low temperature) is January (-13.3°C).
Average pressure in September
Arolla, Switzerland
- Average pressure in September: 1017.9mbar
The month with the highest atmospheric pressure is December (1020.7mbar).
The month with the lowest atmospheric pressure is April (1015mbar).
Average wind speed in September
Arolla, Switzerland
- Average wind speed in September: 6.7km/h
The windiest month (with the highest average wind speed) is December (10km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in September
Arolla, Switzerland
- Average humidity in September: 83%
The month with the highest relative humidity is April (91%).
The month with the lowest relative humidity is July (80%).
Average rainfall in September
Arolla, Switzerland
- Average rainfall in September: 62mm
The wettest month (with the highest rainfall) is May (154mm).
The driest month (with the least rainfall) is February (58mm).
Average rainfall days in September
Arolla, Switzerland
- Average rainfall days in September: 15.4 days
The month with the highest number of rainy days is July (23 days).
The month with the least rainy days is November (3.5 days).
Average snowfall in September
Arolla, Switzerland
- Average snowfall in September: 183mm
The month with the highest snowfall is November (1031mm).
The month with the least snowfall is July (11mm).
Average snowfall days in September
Arolla, Switzerland
- Average snowfall days in September: 6.7 days
The month with the highest number of snowfall days is April (23.8 days).
The months with the least snowfall days are July and August (1.3 days).
Average daylight in September /
Average sunshine in September
Arolla, 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 0min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is November (Average sunshine: 4h and 30min).
Average sunshine days in September
Arolla, Switzerland
- Average sunshine days in September: 10.4 days
The month with the most sunshine days is October (14.5 days).
The month with the least sunshine days is June (4.1 days).
Average UV index in September
Arolla, Switzerland
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 3).
The months with the lowest UV index are January, February, March, April and November (UV index 1).
Average cloud cover in September
Arolla, Switzerland
- Average cloud cover in September: 47
The month with the most cloud cover is April (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 42).
Average visibility in September
Arolla, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are June, July and August (8km).
The months with the lowest visibility are February, March, April, May and November (6km).
Arolla, Switzerland
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