Brittany (Rennes)
September
Weather in Brittany for September 2025
Your guide to Brittany weather in September - trends and predictions
In general, the average temperature in Brittany 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.
Brittany 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 Brittany? check out the best time to travel to Brittany page.
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Temperatures
Rain 🌧️
More
9
Dry days
21
Rainy days
0
Snow days
23°/12°
Temperatures
20 km/h
Avg max wind
70 %
Avg humidity
Brittany 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° |
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Temperatures trend during September in Brittany
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. | 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 | |
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Important Notice
Our weather forecast for Brittany 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 Brittany forecast closer to your planned date for the most up-to-date weather information.
Brittany in September - FAQ
What are the expected maximum and minimum temperatures in Brittany 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 Brittany during September?
Moderate rainfall is anticipated in Brittany 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 Brittany during September?
The average wind speed in Brittany during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Brittany in September?
As you prepare for your trip to Brittany 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 Brittany, 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 Brittany
Explore the daily rainfall trends and prepare for Brittanys September weather 💧
UV exposure in Brittany during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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