September weather forecastGrilly, France
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Grilly, France, with temperature in the range of an average low of 8.4°C (47.1°F) and an average high of 18°C (64.4°F).Temperature
The average high-temperature shows a slight dip in September, from August's pleasant 22.4°C (72.3°F) to a refreshing 18°C (64.4°F). Grilly witnesses a consistent average low-temperature of 8.4°C (47.1°F) throughout September.Humidity
In September, the average relative humidity in Grilly is 82%.Rainfall
In Grilly, during September, the rain falls for 13.9 days and regularly aggregates up to 46mm (1.81") of precipitation. In Grilly, France, during the entire year, the rain falls for 190.1 days and collects up to 748mm (29.45") of precipitation.Snowfall
In Grilly, France, snow does not fall in May through September.Daylight
In September, the average length of the day is 12h and 32min.On the first day of September in Grilly, 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
The average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily high UV index of 3 in September leads to these guidelines:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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
Grilly, France
- 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).
