Climate averages 1991–2020
Saint-Étienne weather
in September.
A mild, wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Saint-Étienne: daytime highs average 20.2°C and nights cool to about 11.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 90 mm of rain on roughly 10 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 35 min on an average September day.
The nearest other city in this atlas is Lyon (50 km away). In September its highs average 22.1°C, 1.9°C warmer than Saint-Étienne, with 93 mm of rain.
Among the 57 cities listed in France, Saint-Étienne ranks joint 39th of 57 for the warmest September highs and 49th of 57 for the driest September (rainfall, lowest first). The mean September high of those 57 cities is 21.3°C; Saint-Étienne is 1.1°C cooler than that mean.
From September to October, average highs fall by 4.4°C to 15.8°C, and monthly rainfall rises from 90 mm to 95 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
Saint-Étienne climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.3°C0.0°C | 0.0°C | 63 | 12.2 | 9.19 h |
| February | 7.4°C-0.2°C | -0.2°C | 49 | 10.0 | 10.410 h |
| March | 11.1°C2.2°C | 2.2°C | 55 | 11.3 | 11.912 h |
| April | 14.3°C4.8°C | 4.8°C | 86 | 12.5 | 13.513 h |
| May | 18.1°C8.7°C | 8.7°C | 98 | 13.5 | 14.915 h |
| June | 22.2°C12.4°C | 12.4°C | 89 | 12.4 | 15.616 h |
| July | 24.6°C14.7°C | 14.7°C | 83 | 10.4 | 15.315 h |
| August | 24.7°C14.7°C | 14.7°C | 77 | 9.7 | 14.114 h |
| September, selected | 20.2°C11.2°C | 11.2°C | 90 | 9.5 | 12.613 h |
| October | 15.8°C8.2°C | 8.2°C | 95 | 11.5 | 11.011 h |
| November | 10.1°C3.7°C | 3.7°C | 94 | 12.3 | 9.610 h |
| December | 7.0°C1.1°C | 1.1°C | 64 | 11.4 | 8.89 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
- Lyon in SeptemberFrance · 50 kmHigh 22.1°C · Low 12.9°C · 93 mm rain
- Villeurbanne in SeptemberFrance · 53 kmHigh 21.8°C · Low 12.9°C · 93 mm rain
- Grenoble in SeptemberFrance · 107 kmHigh 21.8°C · Low 12.8°C · 111 mm rain
- Clermont-Ferrand in SeptemberFrance · 108 kmHigh 20.1°C · Low 10.8°C · 83 mm rain
- Geneva in SeptemberSwitzerland · 161 kmHigh 19.8°C · Low 11.6°C · 109 mm rain
- Avignon in SeptemberFrance · 168 kmHigh 25.2°C · Low 15.2°C · 93 mm rain
- Nîmes in SeptemberFrance · 178 kmHigh 25.1°C · Low 15.3°C · 99 mm rain
- Montpellier in SeptemberFrance · 207 kmHigh 23.7°C · Low 15.6°C · 96 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 Saint-Étienne) is explained once on the Saint-Étienne year overview and on the Sources, method and limits page.