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
Upon the beginning of September, Lannilis's high-temperatures register at a still refreshing 18.6°C (65.5°F), closely mirroring the preceding month. Lannilis's temperature in September lowers to a consistent average of 12.7°C (54.9°F) during the nights.Humidity
April and September, with an average relative humidity of 80%, are the least humid months.Rainfall
The month with the least rainfall is September, when the rain falls for 12.5 days and typically collects 24mm (0.94") of precipitation.Snowfall
In Lannilis, snow does not fall in April through October.Daylight
The average length of the day in September in Lannilis is 12h and 35min.On the first day of September, sunrise is at 07:36 and sunset at 20:59. On the last day of the month, sunrise is at 08:16 and sunset at 19:58 CEST.
Sunshine
The average sunshine in September in Lannilis is 7.1h.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 exposure to the Sun's UV radiation for the ordinary person.Note: In September, an average UV index of 4 transforms into the following instructions:
Be vigilant - A duty to shield skin and eyes from injury exists. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What are the temperatures in Lannilis in September?
What are the least humid months in Lannilis?
What is the average humidity in September in Lannilis?
What is the driest month in Lannilis?
How many days does it rain in September in Lannilis?
When it does not snow in Lannilis?
What is the average length of the day in September in Lannilis?
When are sunrise and sunset in September in Lannilis?
How long on average sun shines in September in Lannilis?
How high is the UV index in September in Lannilis?
Average temperature in September
Lannilis, France
- Average high temperature in September: 18.6°C
The warmest month (with the highest average high temperature) is July (19.9°C).
The month with the lowest average high temperature is February (9.6°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is August (14.1°C).
The coldest month (with the lowest average low temperature) is February (5.6°C).
Average pressure in September
Lannilis, France
- Average pressure in September: 1018.3mbar
The month with the highest atmospheric pressure is September (1018.3mbar).
The month with the lowest atmospheric pressure is November (1012mbar).
Average wind speed in September
Lannilis, France
- Average wind speed in September: 16.7km/h
The windiest month (with the highest average wind speed) is December (24.1km/h).
The calmest month (with the lowest average wind speed) is July (16km/h).
Average humidity in September
Lannilis, France
- Average humidity in September: 80%
The months with the highest relative humidity are January, June and December (83%).
The months with the lowest relative humidity are April and September (80%).
Average rainfall in September
Lannilis, France
- Average rainfall in September: 24mm
The wettest month (with the highest rainfall) is November (77mm).
The driest month (with the least rainfall) is September (24mm).
Average rainfall days in September
Lannilis, France
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is December (19.5 days).
The month with the least rainy days is September (12.5 days).
Average snowfall in September
Lannilis, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (6mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Lannilis, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1 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
Lannilis, France
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 7h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 12min).
Average sunshine days in September
Lannilis, France
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is May (14.7 days).
The month with the least sunshine days is November (7.3 days).
Average UV index in September
Lannilis, France
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Lannilis, France
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 43).
Average visibility in September
Lannilis, France
- Average visibility in September: 9km
The months with the highest visibility are March and April (10km).
The months with the lowest visibility are January, February, May, June, July, August, September, October, November and December (9km).
Lannilis, France
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