September weather forecastSaint-Hélen, France
September
Weather in September
September, the first month of the autumn in Saint-Hélen, is still a comfortable month, with an average temperature fluctuating between 12.5°C (54.5°F) and 19.7°C (67.5°F).Temperature
Saint-Hélen's average high-temperature in September sits at a comfortable 19.7°C (67.5°F), showing little difference from the previous month. September's nights observe an average temperature of 12.5°C (54.5°F).Humidity
The least humid month is September, with an average relative humidity of 78%.Rainfall
September is the month with the least rainfall in Saint-Hélen. Rain falls for 14.3 days and accumulates 28mm (1.1") of precipitation.Snowfall
In Saint-Hélen, snow does not fall in May through October.Daylight
The average length of the day in September in Saint-Hélen is 12h and 35min.On the first day of September, sunrise is at 07:26 and sunset at 20:49. On the last day of the month, sunrise is at 08:06 and sunset at 19:48 CEST.
Sunshine
The average sunshine in September is 7.4h.UV index
In Saint-Hélen, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 4 in September translates into this advice:
Act with care - The suggestion to avoid sunburn is emphasized. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint-Hélen, 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-Hélen, 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-Hélen, 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-Hélen, 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-Hélen, 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-Hélen, 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-Hélen, 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-Hélen, 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-Hélen, 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 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-Hélen, 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-Hélen, 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-Hélen, 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-Hélen, 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).
