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
Attiswil records a mild change in average high-temperature during September, easing from a moderately hot 23.3°C (73.9°F) in August to a refreshing 18.8°C (65.8°F). Throughout the month of September, Attiswil observes an average nighttime temperature of 8.2°C (46.8°F).Humidity
In Attiswil, the average relative humidity in September is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 14.5 days and accumulates 45mm (1.77") of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in Attiswil is 12h and 34min.On the first day of September, sunrise is at 06:49 and sunset at 20:09. On the last day of the month, sunrise is at 07:27 and sunset at 19:10 CEST.
Sunshine
In Attiswil, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Attiswil is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
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. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Frequently asked questions
What are the temperatures in Attiswil in September?
What is the average humidity in September in Attiswil?
What is the driest month in Attiswil?
How much does it rain in Attiswil in September?
When it does not snow in Attiswil?
Does it snow in Attiswil in September?
What is the average length of the day in September in Attiswil?
What time are sunrise and sunset in September in Attiswil?
How many hours of sunshine does Attiswil have in September?
How high is the UV index in September in Attiswil?
Average temperature in September
Attiswil, Switzerland
- Average high temperature in September: 18.8°C
The warmest months (with the highest average high temperature) are July and August (23.3°C).
The month with the lowest average high temperature is January (2.9°C).
- Average low temperature in September: 8.2°C
The months with the highest average low temperature are July and August (11.8°C).
The coldest month (with the lowest average low temperature) is February (-3.4°C).
Average pressure in September
Attiswil, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).
Average wind speed in September
Attiswil, Switzerland
- Average wind speed in September: 6.4km/h
The windiest month (with the highest average wind speed) is March (8.8km/h).
The calmest month (with the lowest average wind speed) is August (5.9km/h).
Average humidity in September
Attiswil, Switzerland
- Average humidity in September: 81%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and July (78%).
Average rainfall in September
Attiswil, Switzerland
- Average rainfall in September: 45mm
The wettest month (with the highest rainfall) is May (106mm).
The driest month (with the least rainfall) is September (45mm).
Average rainfall days in September
Attiswil, Switzerland
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (22.4 days).
The month with the least rainy days is February (10.6 days).
Average snowfall in September
Attiswil, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (153mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Attiswil, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Attiswil, Switzerland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Attiswil, Switzerland
- Average sunshine days in September: 12.2 days
The month with the most sunshine days is October (15 days).
The month with the least sunshine days is May (6.6 days).
Average UV index in September
Attiswil, Switzerland
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Attiswil, Switzerland
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Attiswil, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are March, April, July and August (9km).
The months with the lowest visibility are January, February, May, June, September, October, November and December (8km).
Attiswil, Switzerland
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