September weather forecastHeiwiller, France
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Heiwiller, France, with an average temperature varying between 9.6°C (49.3°F) and 19.9°C (67.8°F).Temperature
As September begins, there is a minor decrease in the average high-temperature, softly falling from a warm 24.1°C (75.4°F) in August to a refreshing 19.9°C (67.8°F). Throughout the month of September, the nighttime temperature in Heiwiller, France, dips to an average of 9.6°C (49.3°F).Humidity
The average relative humidity in September is 79%.Rainfall
The month with the least rainfall in Heiwiller, France, is September, when the rain falls for 12.4 days and typically collects 33mm (1.3") of precipitation.Snowfall
April through September are months without snowfall in Heiwiller.Daylight
In September, the average length of the day is 12h and 34min.On the first day of September in Heiwiller, sunrise is at 06:49 and sunset at 20:11. On the last day of the month, sunrise is at 07:29 and sunset at 19:11 CEST.
Sunshine
In September, the average sunshine in Heiwiller is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Heiwiller, France
- Average high temperature in September: 19.9°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 (3.8°C).
- Average low temperature in September: 9.6°C
The month with the highest average low temperature is August (13.3°C).
The coldest month (with the lowest average low temperature) is January (-1.7°C).
Average pressure in September
Heiwiller, France
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.6mbar).
The month with the lowest atmospheric pressure is November (1015.6mbar).
Average wind speed in September
Heiwiller, France
- Average wind speed in September: 7.2km/h
The windiest month (with the highest average wind speed) is February (10.1km/h).
The calmest month (with the lowest average wind speed) is August (6.7km/h).
Average humidity in September
Heiwiller, France
- Average humidity in September: 79%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and August (76%).
Average rainfall in September
Heiwiller, France
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is June (82mm).
The driest month (with the least rainfall) is September (33mm).
Average rainfall days in September
Heiwiller, France
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is May (20.8 days).
The month with the least rainy days is October (12.2 days).
Average snowfall in September
Heiwiller, France
- Average snowfall in September: 0mm
The month with the highest snowfall is December (60mm).
The months with the least snowfall are April, May, June, July, August and September (0mm).
Average snowfall days in September
Heiwiller, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Heiwiller, 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: 8h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Heiwiller, France
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is October (16 days).
The month with the least sunshine days is May (7.5 days).
Average UV index in September
Heiwiller, 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, February, November and December (UV index 2).
Average cloud cover in September
Heiwiller, France
- Average cloud cover in September: 34
The months with the most cloud cover are January and December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Heiwiller, France
- Average visibility in September: 8km
The months with the highest visibility are March, April, May, June, July, August and October (9km).
The months with the lowest visibility are January, February, September, November and December (8km).
