Climate averages 1991–2020
Nantes weather
in September.
A mild, moderately wet month: the 4th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Nantes: daytime highs average 21.3°C and nights cool to about 13.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 49 mm of rain on roughly 7 days, which makes September a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 37 min on an average September day.
The nearest other city in this atlas is Angers (81 km away). In September its highs average 21.3°C, about as warm as Nantes, with 50 mm of rain.
Among the 57 cities listed in France, Nantes ranks joint 22nd of 57 for the warmest September highs and joint 13th of 57 for the driest September (rainfall, lowest first). The mean September high of those 57 cities is 21.3°C; Nantes is level with that mean.
From September to October, average highs fall by 4.3°C to 16.9°C, and monthly rainfall rises from 49 mm to 73 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Nantes climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.9°C3.8°C | 3.8°C | 71 | 11.2 | 9.09 h |
| February | 9.7°C3.4°C | 3.4°C | 56 | 9.7 | 10.210 h |
| March | 12.5°C5.2°C | 5.2°C | 53 | 10.3 | 11.912 h |
| April | 15.1°C7.1°C | 7.1°C | 57 | 10.4 | 13.614 h |
| May | 18.4°C10.3°C | 10.3°C | 61 | 10.6 | 15.115 h |
| June | 21.7°C13.4°C | 13.4°C | 46 | 8.4 | 15.916 h |
| July | 23.7°C15.2°C | 15.2°C | 39 | 7.3 | 15.516 h |
| August | 23.9°C15.3°C | 15.3°C | 47 | 7.3 | 14.214 h |
| September, selected | 21.3°C13.0°C | 13.0°C | 49 | 7.4 | 12.613 h |
| October | 16.9°C10.5°C | 10.5°C | 73 | 11.4 | 10.911 h |
| November | 12.3°C6.8°C | 6.8°C | 70 | 11.3 | 9.49 h |
| December | 9.3°C4.3°C | 4.3°C | 79 | 11.4 | 8.69 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Angers in SeptemberFrance · 81 kmHigh 21.3°C · Low 12.6°C · 50 mm rain
- Rennes in SeptemberFrance · 100 kmHigh 20.5°C · Low 12.2°C · 49 mm rain
- La Rochelle in SeptemberFrance · 121 kmHigh 21.6°C · Low 14.4°C · 55 mm rain
- Le Mans in SeptemberFrance · 158 kmHigh 20.8°C · Low 12.2°C · 51 mm rain
- Poitiers in SeptemberFrance · 160 kmHigh 21.7°C · Low 12.6°C · 50 mm rain
- Tours in SeptemberFrance · 171 kmHigh 21.6°C · Low 12.8°C · 49 mm rain
- Saint Helier in SeptemberJersey · 223 kmHigh 17.5°C · Low 15.1°C · 77 mm rain
- Caen in SeptemberFrance · 236 kmHigh 19.8°C · Low 12.4°C · 53 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Nantes) is explained once on the Nantes year overview and on the Sources, method and limits page.