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
Weather in September
Temperature
The move into September indicates a slight reduction in the average high-temperature, down from August's pleasant 22.7°C (72.9°F) to an enjoyable 19.5°C (67.1°F). Sailly-sur-la-Lys experiences an average temperature drop to a fresh 11.8°C (53.2°F) during September nights.Humidity
In September, the average relative humidity is 77%.Rainfall
September is the month with the least rainfall in Sailly-sur-la-Lys. Rain falls for 7.5 days and accumulates 12mm (0.47") of precipitation.Snowfall
In Sailly-sur-la-Lys, snow does not fall in April through October.Daylight
In Sailly-sur-la-Lys, the average length of the day in September is 12h and 37min.On the first day of the month, sunrise is at 07:03 and sunset at 20:33. On the last day of September, in Sailly-sur-la-Lys, France, sunrise is at 07:48 and sunset at 19:28 CEST.
Sunshine
The average sunshine in September in Sailly-sur-la-Lys is 7.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 in September translates into this advice:
Heed the precautions - Suggestions to avoid sunburn are made. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Sailly-sur-la-Lys?
What is the average humidity in September in Sailly-sur-la-Lys?
What is the driest month in Sailly-sur-la-Lys?
How many days does it rain in September in Sailly-sur-la-Lys?
When it does not snow in Sailly-sur-la-Lys?
How many hours of daylight does Sailly-sur-la-Lys have in September?
When are sunrise and sunset in September in Sailly-sur-la-Lys?
How long on average sun shines in September in Sailly-sur-la-Lys?
What is the UV index intensity in September in Sailly-sur-la-Lys?
Average temperature in September
Sailly-sur-la-Lys, France
- Average high temperature in September: 19.5°C
The warmest months (with the highest average high temperature) are July and August (22.7°C).
The month with the lowest average high temperature is January (6.2°C).
- Average low temperature in September: 11.8°C
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is January (1.8°C).
Average pressure in September
Sailly-sur-la-Lys, France
- Average pressure in September: 1017.5mbar
The month with the highest atmospheric pressure is September (1017.5mbar).
The month with the lowest atmospheric pressure is November (1011.9mbar).
Average wind speed in September
Sailly-sur-la-Lys, France
- Average wind speed in September: 13.1km/h
The windiest month (with the highest average wind speed) is December (18.2km/h).
The calmest month (with the lowest average wind speed) is August (12.9km/h).
Average humidity in September
Sailly-sur-la-Lys, France
- Average humidity in September: 77%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is August (74%).
Average rainfall in September
Sailly-sur-la-Lys, France
- Average rainfall in September: 12mm
The wettest month (with the highest rainfall) is December (61mm).
The driest month (with the least rainfall) is September (12mm).
Average rainfall days in September
Sailly-sur-la-Lys, France
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is December (18 days).
The month with the least rainy days is September (7.5 days).
Average snowfall in September
Sailly-sur-la-Lys, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (34mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Sailly-sur-la-Lys, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4 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
Sailly-sur-la-Lys, France
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
- Average sunshine in September: 7h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The months with the least sunshine are January and December (Average sunshine: 4h and 0min).
Average sunshine days in September
Sailly-sur-la-Lys, France
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is September (21.5 days).
The months with the least sunshine days are February and December (8.5 days).
Average UV index in September
Sailly-sur-la-Lys, 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
Sailly-sur-la-Lys, France
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are April and August (Cloud cover 40).
Average visibility in September
Sailly-sur-la-Lys, France
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Sailly-sur-la-Lys, France
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