Monthly climate guide
Grenoble weather in September
September in Grenoble is typically mild, with average daytime highs around 20°C (67°F) and night-time lows near 8°C (47°F). The month usually brings about 63 mm of rain (some rain) and is a mix of sun and cloud. Daytime highs are 4°C cooler than August and 4°C warmer than October.
What stands out in September
- September brings early autumn to Grenoble.
- Afternoons and nights feel like different seasons, roughly 11°C apart.
- Grenoble is usually about 4°C cooler than Lyon, 90 km away, in September.
- Temperatures are falling — expect highs around 4°C lower by October.
Avg high
20°C
67°F
Avg low
8°C
47°F
Rainfall
63 mm
some rain
Humidity
75%
relative
Sky
53%
cloud · a mix of sun and cloud
Grenoble weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 4°C / 39°F | -4°C / 25°F | 77 mm | 87% | 76% |
| February | 5°C / 41°F | -4°C / 24°F | 59 mm | 84% | 69% |
| March | 10°C / 49°F | -1°C / 30°F | 68 mm | 79% | 62% |
| April | 13°C / 56°F | 2°C / 36°F | 70 mm | 76% | 60% |
| May | 16°C / 60°F | 5°C / 42°F | 95 mm | 78% | 65% |
| June | 20°C / 69°F | 10°C / 49°F | 79 mm | 77% | 59% |
| July | 23°C / 73°F | 12°C / 53°F | 65 mm | 74% | 49% |
| August | 23°C / 74°F | 11°C / 52°F | 53 mm | 70% | 47% |
| September | 20°C / 67°F | 8°C / 47°F | 63 mm | 75% | 53% |
| October | 15°C / 59°F | 5°C / 40°F | 92 mm | 78% | 66% |
| November | 9°C / 48°F | 1°C / 33°F | 117 mm | 84% | 73% |
| December | 5°C / 41°F | -2°C / 28°F | 89 mm | 85% | 71% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
Is September a good time to visit Grenoble?
Compare the months in the chart above to find your ideal window.
Best time to visit Grenoble →Other France cities in September
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Grenoble weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/france/grenoble/september
<a href="https://weathercompare.eu/weather/france/grenoble/september">Grenoble weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/france/grenoble" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Grenoble weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/france/grenoble/september">Grenoble weather in September</a> – WeatherCompare</p>
Grenoble in September: quick answers
Is September a good time to visit Grenoble?
Yes. September is one of the best months for Grenoble, with highs around 20°C and about 63 mm of rain.
How warm is Grenoble in September?
Average highs are about 20°C (67°F) and average lows about 8°C (47°F), based on 10 years of daily data.
Does it rain a lot in Grenoble in September?
Grenoble typically gets around 63 mm of rain in September — some rain.
Figures are long-term averages for the area around Grenoble (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.