September weather forecastChartres, France
September
Weather in September
September marks the beginning of autumn, with temperatures in Chartres falling from the summer peak to an average high of 20.7°C (69.3°F) and an average low of 11.4°C (52.5°F). A stark reduction in rainfall from 34mm (1.34") in August to 16mm (0.63") ranks September as one of the driest months of the year. This month's weather allows for comfortable explorations amidst the autumn-fall colors and cooler breeze. With daylight hours dwindling, night activities might become more appealing to residents and visitors alike. As September makes way for October, temperature declines continue and signals the approach of winter.Temperature
The shift from August to September in Chartres includes a minor decrease in the average high-temperature, lightly dropping from a moderately hot 24.1°C (75.4°F) to an agreeable 20.7°C (69.3°F). Throughout September, Chartres witnesses a nighttime temperature average of 11.4°C (52.5°F).Humidity
In September, the average relative humidity in Chartres is 73%.Rainfall
The month with the least rainfall is September, when the rain falls for 10.1 days and typically collects 16mm (0.63") of precipitation.Snowfall
In Chartres, snow does not fall in April through October.Daylight
In September, the average length of the day in Chartres is 12h and 35min.On the first day of September in Chartres, sunrise is at 07:12 and sunset at 20:35. On the last day of the month, sunrise is at 07:52 and sunset at 19:34 CEST.
Sunshine
In Chartres, the average sunshine in September is 7.4h.UV index
In Chartres, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Be vigilant - A duty to shield skin and eyes from injury exists. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chartres, France
- Average high temperature in September: 20.7°C
The warmest month (with the highest average high temperature) is August (24.1°C).
The month with the lowest average high temperature is January (6°C).
- Average low temperature in September: 11.4°C
The month with the highest average low temperature is August (14.3°C).
The coldest months (with the lowest average low temperature) are January and February (1.3°C).
Average pressure in September
Chartres, France
- Average pressure in September: 1018.1mbar
The month with the highest atmospheric pressure is December (1018.5mbar).
The month with the lowest atmospheric pressure is November (1013.4mbar).
Average wind speed in September
Chartres, France
- Average wind speed in September: 11.6km/h
The windiest month (with the highest average wind speed) is February (17.2km/h).
The calmest month (with the lowest average wind speed) is August (11.1km/h).
Average humidity in September
Chartres, France
- Average humidity in September: 73%
The months with the highest relative humidity are January and December (88%).
The month with the lowest relative humidity is August (70%).
Average rainfall in September
Chartres, France
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is June (49mm).
The driest month (with the least rainfall) is September (16mm).
Average rainfall days in September
Chartres, France
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is September (10.1 days).
Average snowfall in September
Chartres, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (22mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Chartres, France
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Chartres, France
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 7h and 24min
The months with the most sunshine are July and August (Average sunshine: 8h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Chartres, France
- Average sunshine days in September: 17.7 days
The months with the most sunshine days are September and October (17.7 days).
The month with the least sunshine days is June (9.4 days).
Average UV index in September
Chartres, France
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Chartres, France
- Average cloud cover in September: 39
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 39).
Average visibility in September
Chartres, France
- Average visibility in September: 9km
The months with the highest visibility are February, March, April, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, May and June (8km).
