September weather forecastGrailhen, France
September
Weather in September
September, the first month of the autumn in Grailhen, is also an enjoyable month, with an average temperature fluctuating between 18.5°C (65.3°F) and 7.9°C (46.2°F).Temperature
The onset of September entails a subtle temperature shift, as the average high-temperature eases from an agreeable 22.1°C (71.8°F) in August to a refreshing 18.5°C (65.3°F). Grailhen experiences a consistent average temperature of 7.9°C (46.2°F) throughout the nights in September.Humidity
The average relative humidity in September in Grailhen is 74%.Rainfall
The month with the least rainfall is September, when the rain falls for 11 days and typically collects 33mm (1.3") of precipitation.Snowfall
July through September are months without snowfall in Grailhen.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 07:23 and sunset at 20:33. On the last day of September, in Grailhen, sunrise is at 07:55 and sunset at 19:41 CEST.
Sunshine
The average sunshine in September in Grailhen is 9.3h.UV index
In Grailhen, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Ensure safety - Sun damage prevention is strongly urged. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grailhen, France
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is August (22.1°C).
The months with the lowest average high temperature are January and February (4.6°C).
- Average low temperature in September: 7.9°C
The month with the highest average low temperature is August (10.8°C).
The coldest month (with the lowest average low temperature) is February (-3.5°C).
Average pressure in September
Grailhen, France
- Average pressure in September: 1018.2mbar
The month with the highest atmospheric pressure is December (1021.9mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Grailhen, France
- Average wind speed in September: 5.9km/h
The windiest month (with the highest average wind speed) is November (8.2km/h).
The calmest months (with the lowest average wind speed) are August and September (5.9km/h).
Average humidity in September
Grailhen, France
- Average humidity in September: 74%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is August (71%).
Average rainfall in September
Grailhen, France
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is November (90mm).
The driest month (with the least rainfall) is September (33mm).
Average rainfall days in September
Grailhen, France
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Grailhen, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (482mm).
The months with the least snowfall are July, August and September (0mm).
Average snowfall days in September
Grailhen, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grailhen, France
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is November (Average sunshine: 6h and 6min).
Average sunshine days in September
Grailhen, France
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is December (18.7 days).
The month with the least sunshine days is April (11.6 days).
Average UV index in September
Grailhen, France
- 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, March, November and December (UV index 2).
Average cloud cover in September
Grailhen, France
- Average cloud cover in September: 24
The month with the most cloud cover is April (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Grailhen, France
- Average visibility in September: 9km
The months with the highest visibility are March, May, June, July, August, September, October and December (9km).
The months with the lowest visibility are January, February, April and November (8km).
