September weather forecastLa Roche-Derrien, France
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in La Roche-Derrien, France, with an average temperature ranging between max 18°C (64.4°F) and min 12.7°C (54.9°F).Temperature
With the advent of September, La Roche-Derrien's high-temperatures adjust to a still enjoyable 18°C (64.4°F), closely aligning with the preceding month. The average nighttime temperature in La Roche-Derrien lowers to a cool 12.7°C (54.9°F) throughout September.Humidity
The months with the lowest humidity in La Roche-Derrien are February through April, September and October, with an average relative humidity of 82%.Rainfall
September is the month with the least rainfall. Rain falls for 13.7 days and accumulates 28mm (1.1") of precipitation.Snowfall
In La Roche-Derrien, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 35min.On the first day of September, sunrise is at 07:30 and sunset at 20:54. On the last day of the month, sunrise is at 08:11 and sunset at 19:53 CEST.
Sunshine
The average sunshine in September is 7.3h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, France
- Average daylight in September: 12h and 36min
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 18min
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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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
La Roche-Derrien, 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).
