September weather forecastSierre, Switzerland
September
Weather in September
The first month of the autumn, September, is still a cool month in Sierre, Switzerland, with an average temperature fluctuating between 12.3°C (54.1°F) and 3.3°C (37.9°F).Temperature
The start of September signals a gentle decrease in the average high-temperature, transitioning from an enjoyable 16.4°C (61.5°F) in August to a cool 12.3°C (54.1°F). Sierre experiences a consistent average temperature of 3.3°C (37.9°F) throughout the nights in September.Humidity
In Sierre, the average relative humidity in September is 82%.Rainfall
The months with the least rainfall in Sierre are September and October Rain falls for 16.5 days and accumulates 54mm (2.13") of rain.Snowfall
Months with snowfall in Sierre are January through December. In Sierre, in September, snow falls for 2.1 days, with typically accumulated 36mm (1.42") of snow. In Sierre, during the entire year, snow falls for 129 days and aggregates up to 4010mm (157.87") of snow.Daylight
The average length of the day in September in Sierre is 12h and 32min.On the first day of September, sunrise is at 06:50 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 September, the average sunshine is 8.1h.UV index
In Sierre, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 3 in September leads to these recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sierre, Switzerland
- Average high temperature in September: 12.3°C
The warmest month (with the highest average high temperature) is July (16.5°C).
The month with the lowest average high temperature is January (-2.6°C).
- Average low temperature in September: 3.3°C
The month with the highest average low temperature is August (6.4°C).
The coldest month (with the lowest average low temperature) is February (-11.3°C).
Average pressure in September
Sierre, Switzerland
- Average pressure in September: 1018.3mbar
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
Sierre, Switzerland
- Average wind speed in September: 6.5km/h
The windiest month (with the highest average wind speed) is December (8.4km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in September
Sierre, Switzerland
- Average humidity in September: 82%
The month with the highest relative humidity is March (91%).
The months with the lowest relative humidity are July and August (79%).
Average rainfall in September
Sierre, Switzerland
- Average rainfall in September: 54mm
The wettest month (with the highest rainfall) is May (126mm).
The driest months (with the least rainfall) are September and October (54mm).
Average rainfall days in September
Sierre, Switzerland
- Average rainfall days in September: 16.5 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Sierre, Switzerland
- Average snowfall in September: 36mm
The month with the highest snowfall is December (887mm).
The month with the least snowfall is July (5mm).
Average snowfall days in September
Sierre, Switzerland
- Average snowfall days in September: 2.1 days
The month with the highest number of snowfall days is March (21.1 days).
The month with the least snowfall days is August (0.4 days).
Average daylight in September /
Average sunshine in September
Sierre, Switzerland
- Average daylight in September: 12h and 30min
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 6min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Sierre, Switzerland
- Average sunshine days in September: 9.7 days
The month with the most sunshine days is October (15.4 days).
The month with the least sunshine days is May (4.2 days).
Average UV index in September
Sierre, 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, March, April and November (UV index 1).
Average cloud cover in September
Sierre, Switzerland
- Average cloud cover in September: 43
The month with the most cloud cover is March (Cloud cover 56).
The month with the least cloud cover is October (Cloud cover 38).
Average visibility in September
Sierre, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are June, July, August and October (8km).
The months with the lowest visibility are January, February and March (6km).
