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
September
Weather in September
Temperature
The transition from August to September brings an average high-temperature of a refreshing 19.7°C (67.5°F), barely different from August's 21.3°C (70.3°F). During September, Saint-Rieul's temperature averages to a cool 12.5°C (54.5°F) at night.Humidity
With an average relative humidity of 78%, September is the least humid month in Saint-Rieul.Rainfall
September is the month with the least rainfall in Saint-Rieul. Rain falls for 14.3 days and accumulates 28mm (1.1") of precipitation.Snowfall
May through October are months without snowfall.Daylight
In Saint-Rieul, the average length of the day in September is 12h and 35min.On the first day of the month, sunrise is at 07:27 and sunset at 20:51. On the last day of September, in Saint-Rieul, sunrise is at 08:08 and sunset at 19:50 CEST.
Sunshine
In Saint-Rieul, the average sunshine in September is 7.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Saint-Rieul?
What is the least humid month in Saint-Rieul?
What is the average humidity in September in Saint-Rieul?
What is the driest month in Saint-Rieul?
How much does it rain in Saint-Rieul in September?
When it does not snow in Saint-Rieul?
How many hours of daylight does Saint-Rieul have in September?
What time are sunrise and sunset in September in Saint-Rieul?
How many hours of sunshine does Saint-Rieul have in September?
How high is the UV index in September in Saint-Rieul?
Average temperature in September
Saint-Rieul, France
- Average high temperature in September: 19.7°C
The warmest month (with the highest average high temperature) is August (21.3°C).
The month with the lowest average high temperature is January (8.7°C).
- Average low temperature in September: 12.5°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (4.3°C).
Average pressure in September
Saint-Rieul, France
- Average pressure in September: 1018.2mbar
The month with the highest atmospheric pressure is September (1018.2mbar).
The month with the lowest atmospheric pressure is November (1012.4mbar).
Average wind speed in September
Saint-Rieul, France
- Average wind speed in September: 15.3km/h
The windiest month (with the highest average wind speed) is December (22.3km/h).
The calmest month (with the lowest average wind speed) is August (14.3km/h).
Average humidity in September
Saint-Rieul, France
- Average humidity in September: 78%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is September (78%).
Average rainfall in September
Saint-Rieul, France
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is November (72mm).
The driest month (with the least rainfall) is September (28mm).
Average rainfall days in September
Saint-Rieul, France
- Average rainfall days in September: 14.3 days
The month with the highest number of rainy days is January (20.2 days).
The month with the least rainy days is September (14.3 days).
Average snowfall in September
Saint-Rieul, France
- Average snowfall in September: 0mm
The month with the highest snowfall is December (11mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Saint-Rieul, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Saint-Rieul, France
- Average daylight in September: 12h and 4min
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 2min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Saint-Rieul, France
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is September (12.5 days).
The months with the least sunshine days are January and November (6.6 days).
Average UV index in September
Saint-Rieul, 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 and February (UV index 2).
Average cloud cover in September
Saint-Rieul, France
- Average cloud cover in September: 39
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 39).
Average visibility in September
Saint-Rieul, France
- Average visibility in September: 9km
The month with the highest visibility is March (10km).
The months with the lowest visibility are January, February, April, May, June, July, August, September, October, November and December (9km).
