Ille-et-Vilaine (Rennes)
September
Weather in Ille-et-Vilaine for September 2025
Your guide to Ille-et-Vilaine weather in September - trends and predictions
In general, the average temperature in Ille-et-Vilaine at the beginning of September is 26.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.3 °C by the end of September.
Ille-et-Vilaine experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 69.4 mm.
Is September a good time to visit Ille-et-Vilaine? check out the best time to travel to Ille-et-Vilaine page.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
9
Dry days
21
Rainy days
0
Snow days
23°/12°
Temperatures
20 km/h
Avg max wind
70 %
Avg humidity
Ille-et-Vilaine in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2  25° | 3  27° | 4  28° | 5 28° | 6  27° | 7 26° |
| 8 25° | 9 25° | 10  25° | 11 24° | 12 24° | 13 25° | 14 24° |
| 15 24° | 16 23° | 17 23° | 18 23° | 19 22° | 20 22° | 21 20° |
| 22 22° | 23 20° | 24  20° | 25 20° | 26 20° | 27 19° | 28 18° |
| 29 18° | 30 20° |
You can click on date
Access Ille-et-Vilaine weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Ille-et-Vilaine
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Moderate or heavy rain shower | 25° /15° | 6.9 mm | 6 | |
| 2 Sept. | Sunny | 25° /13° | 1.4 mm | 6 | |
| 3 Sept. | Partly cloudy | 27° /13° | 0.4 mm | 6 | |
| 4 Sept. | Heavy rain at times | 28° /14° | 1 mm | 6 | |
| 5 Sept. | Partly cloudy | 28° /15° | 1.2 mm | 7 | |
| 6 Sept. | Patchy rain possible | 27° /15° | 1.7 mm | 6 | |
| 7 Sept. | Partly cloudy | 26° /15° | 6.7 mm | 7 | |
| 8 Sept. | Moderate or heavy rain shower | 25° /15° | 9.7 mm | 6 | |
| 9 Sept. | Patchy rain possible | 25° /14° | 2.7 mm | 6 | |
| 10 Sept. | Overcast | 25° /13° | 0.3 mm | 6 | |
| 11 Sept. | Partly cloudy | 24° /11° | 0.5 mm | 6 | |
| 12 Sept. | Partly cloudy | 24° /12° | 0.6 mm | 6 | |
| 13 Sept. | Partly cloudy | 25° /13° | 3.1 mm | 6 | |
| 14 Sept. | Moderate or heavy rain shower | 24° /12° | 3.2 mm | 6 | |
| 15 Sept. | Patchy rain possible | 24° /11° | 0.2 mm | 6 | |
| 16 Sept. | Patchy rain possible | 23° /12° | 0.2 mm | 5 | |
| 17 Sept. | Partly cloudy | 23° /11° | 0.7 mm | 6 | |
| 18 Sept. | Moderate rain at times | 23° /11° | 1.7 mm | 6 | |
| 19 Sept. | Partly cloudy | 22° /11° | 0.5 mm | 6 | |
| 20 Sept. | Overcast | 22° /11° | 1.9 mm | 5 | |
| 21 Sept. | Sunny | 20° /10° | 4.2 mm | 5 | |
| 22 Sept. | Sunny | 22° /9° | 1.6 mm | 5 | |
| 23 Sept. | Sunny | 20° /9° | 3.3 mm | 5 | |
| 24 Sept. | Cloudy | 20° /10° | 1.5 mm | 5 | |
| 25 Sept. | Patchy rain possible | 20° /10° | 6 mm | 5 | |
| 26 Sept. | Patchy rain possible | 20° /12° | 2.3 mm | 5 | |
| 27 Sept. | Heavy rain at times | 19° /10° | 2.2 mm | 4 | |
| 28 Sept. | Patchy rain possible | 18° /9° | 1.9 mm | 4 | |
| 29 Sept. | Partly cloudy | 18° /8° | 1.2 mm | 4 | |
| 30 Sept. | Patchy rain possible | 20° /8° | 0.9 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Ille-et-Vilaine 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 Ille-et-Vilaine forecast closer to your planned date for the most up-to-date weather information.
Ille-et-Vilaine in September - FAQ
What are the expected maximum and minimum temperatures in Ille-et-Vilaine during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Ille-et-Vilaine during September?
Moderate rainfall is anticipated in Ille-et-Vilaine during September, with a total of 69.4 mm spread over approximately 21 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Ille-et-Vilaine during September?
The average wind speed in Ille-et-Vilaine during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Ille-et-Vilaine in September?
As you prepare for your trip to Ille-et-Vilaine 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 Ille-et-Vilaine, 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 Ille-et-Vilaine
Explore the daily rainfall trends and prepare for Ille-et-Vilaines September weather 💧
UV exposure in Ille-et-Vilaine during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Ille-et-Vilaine
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Ille-et-Vilaine?Get accurate weather forecasts for Ille-et-Vilaine, located at latitude 48.112 and longitude -1.674. Stay updated with localized weather information tailored for Ille-et-Vilaine.
Found a mistake?
We appreciate your attention to details. Tell us here.