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
Porrentruy in September undergoes a slight reduction in the average high-temperature, shifting from August's pleasant 22.8°C (73°F) to an enjoyable 18.5°C (65.3°F). In September, Porrentruy encounters an average low-temperature of 8.5°C (47.3°F) during the night.Humidity
The average relative humidity in September in Porrentruy is 83%.Rainfall
The month with the least rainfall in Porrentruy is September, when the rain falls for 14.3 days and typically collects 40mm (1.57") of precipitation.Snowfall
In Porrentruy, snow does not fall in June through September.Daylight
In Porrentruy, the average length of the day in September is 12h and 34min.On the first day of September in Porrentruy, sunrise is at 06:51 and sunset at 20:11. On the last day of the month, sunrise is at 07:29 and sunset at 19:13 CEST.
Sunshine
The average sunshine in September in Porrentruy, Switzerland, is 8.3h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: An average maximum UV index of 3 in September leads to these recommendations:
Exercise prevention - Precautions against solar damage are endorsed. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Frequently asked questions
What is the average September temperature in Porrentruy?
What is the average humidity in September in Porrentruy?
What is the driest month in Porrentruy?
How many days does it rain in September in Porrentruy?
When it does not snow in Porrentruy?
Does it snow in Porrentruy in September?
What is the average length of the day in September in Porrentruy?
When are sunrise and sunset in September in Porrentruy?
How many hours of sunshine does Porrentruy have in September?
What is the UV index reading in September in Porrentruy?
Average temperature in September
Porrentruy, Switzerland
- Average high temperature in September: 18.5°C
The warmest months (with the highest average high temperature) are July and August (22.8°C).
The month with the lowest average high temperature is January (3.3°C).
- Average low temperature in September: 8.5°C
The month with the highest average low temperature is July (12.3°C).
The coldest month (with the lowest average low temperature) is January (-2°C).
Average pressure in September
Porrentruy, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.8mbar).
The months with the lowest atmospheric pressure are April and November (1015.7mbar).
Average wind speed in September
Porrentruy, Switzerland
- Average wind speed in September: 8.4km/h
The windiest month (with the highest average wind speed) is February (12.3km/h).
The calmest month (with the lowest average wind speed) is August (7.7km/h).
Average humidity in September
Porrentruy, Switzerland
- Average humidity in September: 83%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (80%).
Average rainfall in September
Porrentruy, Switzerland
- Average rainfall in September: 40mm
The wettest month (with the highest rainfall) is June (94mm).
The driest month (with the least rainfall) is September (40mm).
Average rainfall days in September
Porrentruy, Switzerland
- Average rainfall days in September: 14.3 days
The month with the highest number of rainy days is June (20.9 days).
The month with the least rainy days is February (10.6 days).
Average snowfall in September
Porrentruy, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (170mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Porrentruy, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Porrentruy, 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 30min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 24min).
Average sunshine days in September
Porrentruy, Switzerland
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is October (14.8 days).
The month with the least sunshine days is June (6.7 days).
Average UV index in September
Porrentruy, 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, October, November and December (UV index 2).
Average cloud cover in September
Porrentruy, Switzerland
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Porrentruy, 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).
Porrentruy, Switzerland
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