Nantes is typically mild in September.

Maximum temperatures go down compared to the previous month from +75°F to +72°F. The minimum temperature also goes down from +57°F to +54°F.

Pack a light jacket as it will be warm in the day and cool in the evenings.

September is one of the warmest months in Nantes, here is the comparison with other months:

September weather is still as good as in August. It’s getting colder in September. From +75°F in the day, the average maximum temperature lowers to +72°F. Prepare for more rain. Average rainfall goes from 40 mm to 47 mm. Humidity rises from 74% to 76%. The average wind speed doesn’t change much during September, staying around 2 m/s. The amount of sunny days stay about the same, averaging 10 sunny days during the month.

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

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

The average temperature was the lowest in 1980 (+58°F) and the highest in 2022 (+66°F). The driest year was 1996 with only 424 mm of rainfall, and the wettest year was 2000 with 898 mm.

For this page, we’ve looked at the typical weather in Nantes, 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.