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 shift into September reveals an average high-temperature of a still enjoyable 17.8°C (64°F), closely mirroring August's climate. During the September nights, Boulogne-sur-Mer's temperature maintains an average close to the daytime highs, settling at a mild 13.8°C (56.8°F).Humidity
August and September, with an average relative humidity of 79%, are the least humid months in Boulogne-sur-Mer, France.Rainfall
In Boulogne-sur-Mer, during September, the rain falls for 13.2 days and regularly aggregates up to 31mm (1.22") of precipitation. In Boulogne-sur-Mer, during the entire year, the rain falls for 175.8 days and collects up to 430mm (16.93") of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September in Boulogne-sur-Mer is 12h and 37min.On the first day of the month, sunrise is at 07:08 and sunset at 20:38. On the last day of September, in Boulogne-sur-Mer, France, sunrise is at 07:53 and sunset at 19:33 CEST.
Sunshine
In September, the average sunshine is 7.4h.UV index
In September, the average daily maximum UV index in Boulogne-sur-Mer, France, is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Take necessary precautions - Protection from skin and eye injury is mandatory. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Frequently asked questions
What is the average September temperature in Boulogne-sur-Mer?
What are the least humid months in Boulogne-sur-Mer?
What is the average humidity in September in Boulogne-sur-Mer?
How much does it rain in Boulogne-sur-Mer in September?
When it does not snow in Boulogne-sur-Mer?
How many hours of daylight does Boulogne-sur-Mer have in September?
What time are sunrise and sunset in September in Boulogne-sur-Mer?
How long on average sun shines in September in Boulogne-sur-Mer?
What is the UV index reading in September in Boulogne-sur-Mer?
Average temperature in September
Boulogne-sur-Mer, France
- Average high temperature in September: 17.8°C
The warmest month (with the highest average high temperature) is August (19.6°C).
The month with the lowest average high temperature is January (7°C).
- Average low temperature in September: 13.8°C
The month with the highest average low temperature is August (15.7°C).
The coldest month (with the lowest average low temperature) is January (4.1°C).
Average pressure in September
Boulogne-sur-Mer, 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 (1011.6mbar).
Average wind speed in September
Boulogne-sur-Mer, France
- Average wind speed in September: 19.8km/h
The windiest month (with the highest average wind speed) is December (27.4km/h).
The calmest month (with the lowest average wind speed) is July (18.1km/h).
Average humidity in September
Boulogne-sur-Mer, France
- Average humidity in September: 79%
The months with the highest relative humidity are January, June and December (83%).
The months with the lowest relative humidity are August and September (79%).
Average rainfall in September
Boulogne-sur-Mer, France
- Average rainfall in September: 31mm
The wettest month (with the highest rainfall) is December (54mm).
The driest months (with the least rainfall) are April and May (19mm).
Average rainfall days in September
Boulogne-sur-Mer, France
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is November (17.9 days).
The month with the least rainy days is April (11.5 days).
Average snowfall in September
Boulogne-sur-Mer, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (21mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Boulogne-sur-Mer, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.5 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
Boulogne-sur-Mer, 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 48min).
The month with the least sunshine is November (Average sunshine: 4h and 12min).
Average sunshine days in September
Boulogne-sur-Mer, France
- Average sunshine days in September: 12.2 days
The month with the most sunshine days is April (15.4 days).
The month with the least sunshine days is November (9.2 days).
Average UV index in September
Boulogne-sur-Mer, 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 and November (UV index 2).
Average cloud cover in September
Boulogne-sur-Mer, France
- Average cloud cover in September: 40
The month with the most cloud cover is November (Cloud cover 59).
The months with the least cloud cover are April and August (Cloud cover 38).
Average visibility in September
Boulogne-sur-Mer, France
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
Boulogne-sur-Mer, France
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