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Weather in Grenoble for September 2025

Your guide to Grenoble weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Grenoble is slightly cooler than the historical average by -1.8 °C.

  • Expect cooler weather in the next days in Grenoble with the forecast suggesting a temperature of 19.6 °C, lower than the historical average.

  • In general, the average temperature in Grenoble at the beginning of September is 24.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.7 °C by the end of September.

    • Rain 🌧️

  • Grenoble in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 131.9 mm.

    • More

  • Is September a good time to visit Grenoble? check out the best time to travel to Grenoble page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/9°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Grenoble Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Sunny
24°
2
Sunny
23°
3
Sunny
24°
4
Sunny
24°
5
Sunny
22°
6
Sunny
25°
7
Sunny
28°
8
Sunny
25°
9
Light rain shower
20°
10
Sunny
20°
11
Partly cloudy
22°
12
Partly cloudy
19°
13
Moderate rain
15°
14
Patchy rain possible
16°
15
Partly cloudy
17°
16
Patchy rain possible
20°
17
Sunny
24°
18
Sunny
29°
19
Sunny
31°
20
Sunny
30°
21
Patchy rain possible
22°
22
Patchy rain possible
19°
23
Patchy rain possible
11°
24
Patchy rain possible
11°
25
Patchy rain possible
12°
26
Partly cloudy
15°
27
Partly cloudy
17°
28
Sunny
20°
29
Patchy rain possible
14°
30
Sunny
21°

Temperatures trend during September in Grenoble

See the weather trend as well as the moving average line

September weather in Grenoble day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 24° /9° 22.5 mm 6
2 Sept. Sunny
Sunny
 23° /10° 0.8 mm 6
3 Sept. Sunny
Sunny
 24° /11° 3.6 mm 6
4 Sept. Sunny
Sunny
 24° /12° 7.3 mm 5
5 Sept. Sunny
Sunny
 22° /10° 5.1 mm 5
6 Sept. Sunny
Sunny
 25° /10° 0 mm 6
7 Sept. Sunny
Sunny
 28° /12° 0.2 mm 7
8 Sept. Sunny
Sunny
 25° /12° 5.1 mm 6
9 Sept. Light rain shower
Light rain shower
 20° /10° 2.3 mm 5
10 Sept. Sunny
Sunny
 20° /9° 1.3 mm 5
11 Sept. Partly cloudy
Partly cloudy
 22° /9° 2.6 mm 5
12 Sept. Partly cloudy
Partly cloudy
 19° /6° 0.5 mm 5
13 Sept. Moderate rain
Moderate rain
 15° /5° 7.7 mm 4
14 Sept. Patchy rain possible
Patchy rain possible
 16° /6° 0.9 mm 4
15 Sept. Partly cloudy
Partly cloudy
 17° /5° 0 mm 5
16 Sept. Patchy rain possible
Patchy rain possible
 20° /2° 0.3 mm 1.2
17 Sept. Sunny
Sunny
 24° /1° 0 mm 1.5
18 Sept. Sunny
Sunny
 29° /5° 0 mm 1.4
19 Sept. Sunny
Sunny
 31° /7° 0 mm 1.5
20 Sept. Sunny
Sunny
 30° /8° 0 mm 1.5
21 Sept. Patchy rain possible
Patchy rain possible
 22° /7° 2.9 mm 4
22 Sept. Patchy rain possible
Patchy rain possible
 19° /5° 0.6 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 11° /3° 1.7 mm 2
24 Sept. Patchy rain possible
Patchy rain possible
 11° /-4° 0.5 mm 2
25 Sept. Patchy rain possible
Patchy rain possible
 12° /-4° 0.1 mm 1
26 Sept. Partly cloudy
Partly cloudy
 15° /-5° 0 mm 2
27 Sept. Partly cloudy
Partly cloudy
 17° /-2° 0 mm 3
28 Sept. Sunny
Sunny
 20° /-2° 0 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 14° /2° 3.4 mm 2
30 Sept. Sunny
Sunny
 21° /12° 3.9 mm 5
Next
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.
Change Month
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Grenoble weather in September vs August vs October

Compare September weather in Grenoble with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures25°/14°21°/9°17°/9°
Rainfall99 mm132 mm202 mm
Wind9 km/h8 km/h8 km/h
Humidity66%73%79%
Rainy days13 days18 days21 days
Dry days18 days12 days10 days

Planning a trip to Grenoble? Discover the best time to visit

Grenoble in September - FAQ

What are the expected maximum and minimum temperatures in Grenoble during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 9°. 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 131.9 mm is expected in Grenoble during September, occurring over more than 18 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 8 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 ☀️

Quick links

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Location coordinates Where is Grenoble?

Get accurate weather forecasts for Grenoble, located at latitude 45.179 and longitude 5.715. Stay updated with localized weather information tailored for Grenoble.

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