Lyon is typically warm in September.

Maximum temperatures go down compared to the previous month from +81°F to +73°F. The minimum temperature also goes down from +61°F to +55°F.

It’s generally warm, but pack a long-sleeve shirt for evenings.

Take a look at how September is compared to other months in Lyon:

September weather is still as good as in August. It’s getting colder in September. From +81°F in the day, the average maximum temperature lowers to +73°F. Prepare for more rain. Average rainfall goes from 84 mm to 90 mm. Humidity rises from 64% to 71%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 11 sunny days in August to 10 in September.

Next month (October) brings a further decline in the weather.

The climate in Lyon in September has not changed that much over the last 43 years.

The average temperature was the lowest in 1980 (+59°F) and the highest in 2023 (+67°F). The driest year was 1991 with only 641 mm of rainfall, and the wettest year was 1987 with 1253 mm.

For this page, we’ve looked at the typical weather in Lyon, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.