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
September
Weather in September
Temperature
Lannion records an average high-temperature of a still comfortable 18°C (64.4°F) in September, maintaining a close correlation with August's 19.1°C (66.4°F). During the month of September, the temperature falls to an average of 12.7°C (54.9°F).Humidity
February through April, September and October, with an average relative humidity of 82%, are the least humid months.Rainfall
The month with the least rainfall is September, when the rain falls for 13.7 days and typically collects 28mm (1.1") of precipitation.Snowfall
In Lannion, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 35min.On the first day of September, sunrise is at 07:31 and sunset at 20:55. On the last day of the month, sunrise is at 08:12 and sunset at 19:54 CEST.
Sunshine
In September, the average sunshine is 7.3h.UV index
In Lannion, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the least humid month?
What is the average humidity in September in Lannion?
What is the driest month in Lannion?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Lannion have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Lannion have in September?
How high is the UV index in September?
Average temperature in September
Lannion, France
- Average high temperature in September: 18°C
The warmest month (with the highest average high temperature) is August (19.1°C).
The month with the lowest average high temperature is January (9°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (5.4°C).
Average pressure in September
Lannion, 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 (1011.9mbar).
Average wind speed in September
Lannion, France
- Average wind speed in September: 18km/h
The windiest months (with the highest average wind speed) are February and December (25.3km/h).
The calmest month (with the lowest average wind speed) is July (16.3km/h).
Average humidity in September
Lannion, France
- Average humidity in September: 82%
The month with the highest relative humidity is June (85%).
The months with the lowest relative humidity are February, March, April, September and October (82%).
Average rainfall in September
Lannion, France
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is November (82mm).
The driest month (with the least rainfall) is September (28mm).
Average rainfall days in September
Lannion, France
- Average rainfall days in September: 13.7 days
The month with the highest number of rainy days is November (21.7 days).
The month with the least rainy days is September (13.7 days).
Average snowfall in September
Lannion, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (11mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Lannion, 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
Lannion, 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Lannion, France
- Average sunshine days in September: 11.1 days
The month with the most sunshine days is September (11.1 days).
The month with the least sunshine days is November (4.8 days).
Average UV index in September
Lannion, France
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February and November (UV index 2).
Average cloud cover in September
Lannion, France
- Average cloud cover in September: 42
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are April, July and September (Cloud cover 42).
Average visibility in September
Lannion, France
- Average visibility in September: 10km
The months with the highest visibility are March, April, June, July and September (10km).
The months with the lowest visibility are January, February, May, August, October, November and December (9km).
