September weather forecastVernier, Switzerland
September
Weather in September
September heralds the arrival of autumn in Vernier—an end to the once-constant buzz of the summer activity. The average high temperature begins to fall, down to 18°C (64.4°F), signposting the transition from summer to autumn. The days start to draw in, and cooler evenings prompt residents to reach for their light jackets and scarves. Reddish hues can be seen taking over the green leaves, hinting the arrival of fall. Despite the slight chill, the city maintains its charm and continues to attract visitors for its awe-inspiring autumnal scenery.Temperature
The average high-temperature shows a slight dip in September, from August's pleasant 22.4°C (72.3°F) to a comfortable 18°C (64.4°F). Vernier's nighttime temperature during September is consistently averaged at a chilly 8.4°C (47.1°F).Humidity
The average relative humidity in September in Vernier, Switzerland, is 82%.Rainfall
In September, in Vernier, the rain falls for 13.9 days. Throughout September, 46mm (1.81") of precipitation is accumulated. In Vernier, during the entire year, the rain falls for 190.1 days and collects up to 748mm (29.45") of precipitation.Snowfall
In Vernier, snow does not fall in May through September.Daylight
In Vernier, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 06:56 and sunset at 20:14. On the last day of the month, sunrise is at 07:33 and sunset at 19:17 CEST.
Sunshine
In September, the average sunshine is 8.5h.UV index
In Vernier, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a daily UV index of 3 turns into the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Vernier, Switzerland
- Average high temperature in September: 18°C
The warmest month (with the highest average high temperature) is July (22.7°C).
The month with the lowest average high temperature is January (2.7°C).
- Average low temperature in September: 8.4°C
The month with the highest average low temperature is July (11.7°C).
The coldest month (with the lowest average low temperature) is February (-3.4°C).
Average pressure in September
Vernier, Switzerland
- Average pressure in September: 1018.5mbar
The month with the highest atmospheric pressure is December (1021.2mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Vernier, Switzerland
- Average wind speed in September: 7km/h
The windiest month (with the highest average wind speed) is February (9.5km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in September
Vernier, Switzerland
- Average humidity in September: 82%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April, July and August (79%).
Average rainfall in September
Vernier, Switzerland
- Average rainfall in September: 46mm
The wettest month (with the highest rainfall) is June (86mm).
The driest month (with the least rainfall) is October (41mm).
Average rainfall days in September
Vernier, Switzerland
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is May (20.3 days).
The month with the least rainy days is February (11.7 days).
Average snowfall in September
Vernier, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (81mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Vernier, Switzerland
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Vernier, 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 30min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Vernier, Switzerland
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is October (15.9 days).
The month with the least sunshine days is June (7.7 days).
Average UV index in September
Vernier, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Vernier, Switzerland
- Average cloud cover in September: 36
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Vernier, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are March and April (9km).
The months with the lowest visibility are January, February, May, June, July, August, September, October, November and December (8km).
