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Weather in September
Temperature
A subtle change in temperatures is noted in Lyon as August gives way to September, with average highs reducing from a warm 27.2°C (81°F) to an agreeable 22.7°C (72.9°F). September brings an average low-temperature of 12.5°C (54.5°F) to Lyon.Humidity
In September, the average relative humidity in Lyon is 76%.Rainfall
In Lyon, in September, during 7.6 rainfall days, 88mm (3.46") of precipitation is typically accumulated. Throughout the year, there are 104.1 rainfall days, and 832mm (32.76") of precipitation is accumulated.Snowfall
In Lyon, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 07:02 and sunset at 20:18. On the last day of September, sunrise is at 07:38 and sunset at 19:22 CEST.
Sunshine
In September, the average sunshine in Lyon is 6.5h.UV index
The average daily maximum UV index in September in Lyon is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 5 in September suggests the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Minimize direct exposure to the Sun during midday when its radiation is at its peak. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
What are September temperatures in Lyon?
What is the average humidity in September in Lyon?
How much does it rain in Lyon in September?
When it does not snow in Lyon?
How many hours of daylight does Lyon have in September?
When is the sunrise / sunset in September in Lyon?
How long on average sun shines in September in Lyon?
What is the UV index intensity in September in Lyon?
Average temperature in September
Lyon, France
- Average high temperature in September: 22.7°C
The warmest month (with the highest average high temperature) is July (27.7°C).
The month with the lowest average high temperature is January (6.4°C).
- Average low temperature in September: 12.5°C
The month with the highest average low temperature is July (16.6°C).
The coldest month (with the lowest average low temperature) is January (0.3°C).
Average humidity in September
Lyon, France
- Average humidity in September: 76%
The month with the highest relative humidity is December (86%).
The month with the lowest relative humidity is July (65%).
Average rainfall in September
Lyon, France
- Average rainfall in September: 87.5mm
The wettest month (with the highest rainfall) is October (98.6mm).
The driest month (with the least rainfall) is February (44.1mm).
Average rainfall days in September
Lyon, France
- Average rainfall days in September: 7.6 days
The month with the highest number of rainy days is May (11.3 days).
The month with the least rainy days is July (6.9 days).
Average snowfall days in September
Lyon, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.5 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
Lyon, France
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 6h and 3min
The month with the most sunshine is July (Average sunshine: 9h and 6min).
The month with the least sunshine is December (Average sunshine: 1h and 48min).
Average UV index in September
Lyon, France
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January and December (UV index 1).
Lyon, France
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