Climatological averages, historical records, packing tips and best time to visit Paris during September. Météo-France / ECMWF reanalysis 1991-2020.
Reference values based on 1991-2020 Météo-France / ECMWF climatology. Year-to-year variation can be significant.
| Metric | Value | Date |
|---|---|---|
| All-time high | 42.6 °C | July 2019 |
| Heatwave record | 40.4 °C | August 2003 |
| All-time low | -23.9 °C | December 1879 |
| 24h rainfall | 104 mm | September 1873 |
Official records (Météo-France). Secondary stations may have more extreme readings.
In September, Paris typically shows early autumn with rentree and crisp evenings. The average high temperature is around 22°C and the average low around 12°C, with monthly rainfall of 48 mm spread over roughly 9 rain days and about 164 hours of sunshine. Average relative humidity stands at 76% and wind speed averages 12 km/h.
The local calendar in September is shaped by Journees du Patrimoine, so checking the forecast a few days in advance is worth it before any outdoor activity. Averages give a general picture but extreme events can vary widely: in September, Paris has recorded both unusually warm spells and cold incursions across recent decades.
For a typical stay we recommend light sweater and trousers. UV protection is sensible on sunny days, even in a mild winter month, and a closed-toe waterproof shoe helps on damp days. For multi-day trips bring thin layers that you can combine through the day.
The first two weeks of September usually offer the best balance in Paris: moderate crowds, friendlier prices and weather that remains representative of the month. Late September starts showing features of the transition to the next month. Use our custom historical lookup to check the actual values for the exact year you plan to travel.
Of the twelve months, September is the 4th warmest in Paris and the driest. It collects 50 mm, 7 % of the whole year’s rain, spread over 9.1 days with appreciable precipitation. The warmest month is August and the wettest is December.
Among the 10 international cities with an ERA5-Land series on this site, in September Paris is the 5th warmest, with a mean maximum of 20.9 °C, and the 9th wettest. The wettest of them that month is Mexico City, with 204 mm against Paris’s 50 mm.
ERA5-Land reanalysis from the Copernicus Climate Data Store (CC-BY licence), 30 complete years, 1995 to 2024. AEMET publishes normals for Spanish stations only, so the figures for Paris come from the global series. Sources and methodology → · Forecast for Paris →
