September weather forecastAyer, Switzerland
September
Weather in September
September, the first month of the autumn in Ayer, is also a fresh month, with temperature in the range of an average high of 12.3°C (54.1°F) and an average low of 3.3°C (37.9°F).Temperature
The shift from August to September coincides with a small decrease in the average high-temperature, down to a fresh 12.3°C (54.1°F) from an enjoyable 16.4°C (61.5°F). In Ayer, the September nights cool down to an average low of 3.3°C (37.9°F).Humidity
In Ayer, Switzerland, the average relative humidity in September is 82%.Rainfall
September and October are months with the least rain in Ayer when the rain falls for 16.5 days and typically aggregates up to 54mm (2.13") of rain.Snowfall
January through December are months with snowfall. In Ayer, in September, during 2.1 snowfall days, 36mm (1.42") of snow is typically accumulated. Throughout the year, there are 129 snowfall days, and 4010mm (157.87") of snow is accumulated.Daylight
In Ayer, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 06:50 and sunset at 20:08. On the last day of September, sunrise is at 07:27 and sunset at 19:11 CEST.
Sunshine
In Ayer, the average sunshine in September is 8.1h.UV index
In September, the average daily maximum UV index in Ayer is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 3 in September translates into this advice:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Around midday, solar radiation is most harmful; hence, exposure should be limited. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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
Ayer, 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).
