Climate averages 1991–2020
Grenoble weather
in September.
A mild, wet month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Grenoble: daytime highs average 21.8°C and nights cool to about 12.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 111 mm of rain on roughly 12 days, which makes September a wet month (the 4th 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 Villeurbanne (92 km away). In September its highs average 21.8°C, about as warm as Grenoble, with 93 mm of rain.
Among the 57 cities listed in France, Grenoble ranks joint 16th of 57 for the warmest September highs and 57th of 57 for the driest September (rainfall, lowest first). The mean September high of those 57 cities is 21.3°C; Grenoble is 0.5°C warmer than that mean.
From September to October, average highs fall by 4.3°C to 17.5°C, and monthly rainfall rises from 111 mm to 118 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
Grenoble climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.2°C-0.3°C | -0.3°C | 119 | 13.1 | 9.29 h |
| February | 8.5°C0.1°C | 0.1°C | 102 | 11.3 | 10.410 h |
| March | 12.8°C3.1°C | 3.1°C | 109 | 12.9 | 11.912 h |
| April | 16.3°C6.2°C | 6.2°C | 120 | 14.3 | 13.513 h |
| May | 20.0°C10.4°C | 10.4°C | 147 | 16.8 | 14.815 h |
| June | 23.9°C14.4°C | 14.4°C | 127 | 15.3 | 15.616 h |
| July | 26.4°C16.8°C | 16.8°C | 113 | 12.8 | 15.315 h |
| August | 26.3°C16.8°C | 16.8°C | 107 | 12.0 | 14.114 h |
| September, selected | 21.8°C12.8°C | 12.8°C | 111 | 11.6 | 12.613 h |
| October | 17.5°C8.8°C | 8.8°C | 118 | 12.7 | 11.011 h |
| November | 11.4°C3.8°C | 3.8°C | 141 | 13.5 | 9.610 h |
| December | 7.7°C0.7°C | 0.7°C | 133 | 13.4 | 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
- Villeurbanne in SeptemberFrance · 92 kmHigh 21.8°C · Low 12.9°C · 93 mm rain
- Lyon in SeptemberFrance · 93 kmHigh 22.1°C · Low 12.9°C · 93 mm rain
- Saint-Étienne in SeptemberFrance · 107 kmHigh 20.2°C · Low 11.2°C · 90 mm rain
- Geneva in SeptemberSwitzerland · 119 kmHigh 19.8°C · Low 11.6°C · 109 mm rain
- Avignon in SeptemberFrance · 154 kmHigh 25.2°C · Low 15.2°C · 93 mm rain
- Turin in SeptemberItaly · 155 kmHigh 21.7°C · Low 13.0°C · 88 mm rain
- Lausanne in SeptemberSwitzerland · 165 kmHigh 18.8°C · Low 13.2°C · 108 mm rain
- Nîmes in SeptemberFrance · 184 kmHigh 25.1°C · Low 15.3°C · 99 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 Grenoble) is explained once on the Grenoble year overview and on the Sources, method and limits page.