September weather forecastRiantec, France
September
Weather in September
September, the first month of the autumn in Riantec, is still a comfortable month, with an average temperature varying between 12.7°C (54.9°F) and 19.4°C (66.9°F).Temperature
Riantec registers an average high-temperature of an enjoyable 19.4°C (66.9°F) at the commencement of September, closely related to the preceding month. Throughout September, Riantec anticipates an average low-temperature of 12.7°C (54.9°F).Humidity
April, July and September, with an average relative humidity of 79%, are the least humid months.Rainfall
In Riantec, France, in September, it is raining for 11.1 days, with typically 31mm (1.22") of accumulated precipitation. Throughout the year, there are 176.7 rainfall days, and 625mm (24.61") of precipitation is accumulated.Snowfall
March, May through November are months without snowfall in Riantec.Sea temperature
In Riantec, in September, the average water temperature is 17.8°C (64°F).Note: A majority do not enjoy swimming in water at 17.8°C (64°F). The difficulty in controlling breathing increases progressively as the temperature dips below 21°C (69.8°F).
Daylight
The average length of the day in September in Riantec is 12h and 34min.On the first day of the month, sunrise is at 07:32 and sunset at 20:53. On the last day of September, in Riantec, sunrise is at 08:11 and sunset at 19:54 CEST.
Sunshine
The average sunshine in September is 7.8h.UV index
In September, the average daily maximum UV index in Riantec is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Riantec, France
- Average high temperature in September: 19.4°C
The warmest months (with the highest average high temperature) are July and August (20.8°C).
The months with the lowest average high temperature are January and February (9.3°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is July (14.3°C).
The coldest month (with the lowest average low temperature) is February (5.3°C).
Average pressure in September
Riantec, France
- Average pressure in September: 1018.5mbar
The month with the highest atmospheric pressure is September (1018.5mbar).
The month with the lowest atmospheric pressure is November (1012.8mbar).
Average wind speed in September
Riantec, France
- Average wind speed in September: 15.5km/h
The windiest months (with the highest average wind speed) are January, February and December (21.6km/h).
The calmest month (with the lowest average wind speed) is August (14.9km/h).
Average humidity in September
Riantec, France
- Average humidity in September: 79%
The months with the highest relative humidity are January and December (84%).
The months with the lowest relative humidity are April, July and September (79%).
Average rainfall in September
Riantec, France
- Average rainfall in September: 31mm
The wettest month (with the highest rainfall) is November (86mm).
The driest month (with the least rainfall) is July (27mm).
Average rainfall days in September
Riantec, France
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is December (17.8 days).
The month with the least rainy days is September (11.1 days).
Average snowfall in September
Riantec, France
- Average snowfall in September: 0mm
The month with the highest snowfall is February (4mm).
The months with the least snowfall are March, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Riantec, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Riantec, France
- Average sea temperature in September: 17.8°C
The best month for swimming (with the highest average sea temperature) is August (17.9°C).
The coldest month (with the lowest average sea temperature) is February (9.9°C).
Average daylight in September /
Average sunshine in September
Riantec, France
- Average daylight in September: 12h and 36min
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: 7h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 3h and 54min).
Average sunshine days in September
Riantec, France
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is September (16.4 days).
The month with the least sunshine days is November (8.5 days).
Average UV index in September
Riantec, France
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Riantec, France
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 36).
Average visibility in September
Riantec, France
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September and November (10km).
The months with the lowest visibility are January, October and December (9km).
