Weather in Nantes in September 2025
Average weather
Average temperature in Nantes in September
The expected average maximum temperature in September is +26°C with a maximum of +34°C and a minimum of +9°C.
The average maximum temperature goes up 8% by the end of the month, compared with the beginning of the month, from +22°C to +24°C.
Is Nantes warm or cold in September?
Nantes is typically mild in September.
Maximum temperatures go down compared to the previous month from +24°C to +22°C. The minimum temperature also goes down from +14°C to +12°C.
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:
Climate in Nantes in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +24°C | +22°C | +17°C | ||||
| Min. temperature | ||||||
| +7°C | +4°C | -1°C | ||||
| Max. temperature | ||||||
| +39°C | +34°C | +29°C | ||||
| Rainfall | ||||||
| 40 mm | 46 mm | 75 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Humidity | ||||||
| 73% | 76% | 83% | ||||
| Air pressure | ||||||
| 1016 HPa | 1016 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 10 | 10 | 6 | ||||
| Cloudy days | ||||||
| 7 | 7 | 8 | ||||
| Rainy days | ||||||
| 12 | 12 | 17 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +24°C in the day, the average maximum temperature lowers to +22°C. Prepare for more rain. Average rainfall goes from 40 mm to 46 mm. Humidity rises from 73% 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.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Nantes is gradually decreasing during September, going from 3 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Nantes?
Climate Change over Years
The climate in Nantes in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+14°C) and the highest in 2022 (+19°C). The driest year was 1996 with only 424 mm of rainfall, and the wettest year was 2000 with 898 mm.
FAQ
Is September a good time to visit Nantes?
Can you sunbathe in Nantes in September?
Is Nantes rainy in September?
Is it sunny in Nantes in September?
Other cities in France
Monthly weather in Nantes
Source of the data
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.