September weather forecastRiaz, Switzerland
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Riaz, Switzerland, with an average temperature ranging between min 5.8°C (42.4°F) and max 16°C (60.8°F).Temperature
September witnesses a gentle descent in average high-temperature, descending from August's agreeable 20.1°C (68.2°F) to a comfortable 16°C (60.8°F). An average low-temperature of 5.8°C (42.4°F) marks the nights in Riaz throughout September.Humidity
In September, the average relative humidity in Riaz, Switzerland, is 80%.Rainfall
The month with the least rainfall in Riaz is September, when the rain falls for 7.2 days and typically collects 10mm (0.39") of precipitation.Snowfall
In Riaz, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 33min.On the first day of September in Riaz, sunrise is at 06:52 and sunset at 20:10. On the last day of the month, sunrise is at 07:29 and sunset at 19:13 CEST.
Sunshine
In Riaz, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 3 in September translates into these instructions:
Act with care - The need to guard against sun damage is communicated. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Riaz, Switzerland
- Average high temperature in September: 16°C
The warmest months (with the highest average high temperature) are July and August (20.1°C).
The month with the lowest average high temperature is January (0.6°C).
- Average low temperature in September: 5.8°C
The month with the highest average low temperature is July (8.8°C).
The coldest month (with the lowest average low temperature) is February (-7.7°C).
Average pressure in September
Riaz, Switzerland
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021.1mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Riaz, Switzerland
- Average wind speed in September: 7km/h
The windiest month (with the highest average wind speed) is December (9.4km/h).
The calmest month (with the lowest average wind speed) is August (6.5km/h).
Average humidity in September
Riaz, Switzerland
- Average humidity in September: 80%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are July and August (78%).
Average rainfall in September
Riaz, Switzerland
- Average rainfall in September: 10mm
The wettest month (with the highest rainfall) is May (38mm).
The driest month (with the least rainfall) is September (10mm).
Average rainfall days in September
Riaz, Switzerland
- Average rainfall days in September: 7.2 days
The months with the highest number of rainy days are June and July (11.7 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Riaz, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (142mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Riaz, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Riaz, Switzerland
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Riaz, Switzerland
- Average sunshine days in September: 21 days
The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is June (15.2 days).
Average UV index in September
Riaz, Switzerland
- Average UV index in September: 3
The month with the highest UV index is June (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Riaz, Switzerland
- Average cloud cover in September: 36
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Riaz, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (8km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (8km).
