Grenoble
September
Weather in Grenoble for September 2025
Your guide to Grenoble weather in September - trends and predictions
In general, the average temperature in Grenoble at the beginning of September is 25 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.1 °C by the end of September.
Grenoble sees moderate rainfall in September, averaging 7 rainy days.
Is September a good time to visit Grenoble? check out the best time to travel to Grenoble page.
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23
Dry days
7
Rainy days
0
Snow days
24°/11°
Temperatures
7 km/h
Avg max wind
67 %
Avg humidity
Grenoble in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2 24° | 3 25° | 4 24° | 5 23° | 6 24° | 7 28° |
| 8 26° | 9 22° | 10 22° | 11  25° | 12 18° | 13  12° | 14  15° |
| 15 17° | 16  17° | 17  21° | 18 18° | 19 19° | 20 22° | 21 22° |
| 22  19° | 23 15° | 24 18° | 25 19° | 26 22° | 27 22° | 28 17° |
| 29 22° | 30 21° |
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Temperatures trend during September in Grenoble
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Sunny | 27° /10° | 4.1 mm | 7 | |
| 2 Sept. | Sunny | 24° /11° | 1 mm | 6 | |
| 3 Sept. | Sunny | 25° /11° | 5.5 mm | 6 | |
| 4 Sept. | Sunny | 24° /12° | 3.4 mm | 6 | |
| 5 Sept. | Sunny | 23° /11° | 7.4 mm | 6 | |
| 6 Sept. | Sunny | 24° /10° | 0 mm | 6 | |
| 7 Sept. | Sunny | 28° /12° | 0.3 mm | 7 | |
| 8 Sept. | Sunny | 26° /12° | 5.7 mm | 6 | |
| 9 Sept. | Sunny | 22° /10° | 0.6 mm | 5 | |
| 10 Sept. | Sunny | 22° /9° | 0.3 mm | 6 | |
| 11 Sept. | Partly cloudy | 25° /9° | 3.8 mm | 6 | |
| 12 Sept. | Partly cloudy | 18° /5° | 0.7 mm | 5 | |
| 13 Sept. | Moderate rain | 12° /4° | 10.6 mm | 3 | |
| 14 Sept. | Cloudy | 15° /4° | 0 mm | 4 | |
| 15 Sept. | Partly cloudy | 17° /5° | 0 mm | 5 | |
| 16 Sept. | Patchy rain possible | 17° /6° | 0.4 mm | 4 | |
| 17 Sept. | Thundery outbreaks possible | 21° /7° | 0.5 mm | 5 | |
| 18 Sept. | Light rain shower | 18° /7° | 23.2 mm | 4 | |
| 19 Sept. | Patchy rain possible | 19° /7° | 0.9 mm | 5 | |
| 20 Sept. | Patchy rain possible | 22° /11° | 1.1 mm | 5 | |
| 21 Sept. | Partly cloudy | 22° /12° | 1.7 mm | 5 | |
| 22 Sept. | Patchy light rain with thunder | 19° /10° | 18.5 mm | 4 | |
| 23 Sept. | Patchy rain possible | 15° /7° | 14.7 mm | 4 | |
| 24 Sept. | Sunny | 18° /5° | 0.1 mm | 5 | |
| 25 Sept. | Sunny | 19° /6° | 0 mm | 5 | |
| 26 Sept. | Sunny | 22° /9° | 16.1 mm | 6 | |
| 27 Sept. | Sunny | 22° /8° | 3.5 mm | 6 | |
| 28 Sept. | Sunny | 17° /8° | 3.8 mm | 5 | |
| 29 Sept. | Sunny | 22° /9° | 0 mm | 6 | |
| 30 Sept. | Sunny | 21° /12° | 3.9 mm | 5 | |
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Important Notice
Our weather forecast for Grenoble in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Grenoble forecast closer to your planned date for the most up-to-date weather information.
Grenoble in September - FAQ
What are the expected maximum and minimum temperatures in Grenoble during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Grenoble during September?
Significant rainfall exceeding 102.6 mm is expected in Grenoble during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Grenoble during September?
The average wind speed in Grenoble during September is 7 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Grenoble in September?
As you prepare for your trip to Grenoble in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Grenoble, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Grenoble
Explore the daily rainfall trends and prepare for Grenobles September weather 💧
UV exposure in Grenoble during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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