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 25.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.7 °C by the end of September.
Brittany sees moderate rainfall in September, averaging 10 rainy days.
Is September a good time to visit Brittany? check out the best time to travel to Brittany page.
- New! Chat with our AI weatherman - it’s amazing and free.
20
Dry days
10
Rainy days
0
Snow days
26°/14°
Temperatures
21 km/h
Avg max wind
67 %
Avg humidity
Brittany in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  24° | 3  27° | 4 27° | 5  27° | 6  27° | 7 25° |
| 8 26° | 9 27° | 10  26° | 11 22° | 12 20° | 13  22° | 14 22° |
| 15 25° | 16 25° | 17  25° | 18 24° | 19 23° | 20 24° | 21 17° |
| 22 20° | 23 18° | 24 20° | 25 20° | 26 22° | 27 19° | 28 19° |
| 29 18° | 30 20° |
You can click on date
Access Brittany weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Brittany
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 | 24° /16° | 7.4 mm | 6 | |
| 2 Sept. | Mist | 24° /12° | 0.5 mm | 6 | |
| 3 Sept. | Sunny | 27° /13° | 0.6 mm | 7 | |
| 4 Sept. | Sunny | 27° /15° | 0.9 mm | 7 | |
| 5 Sept. | Partly cloudy | 27° /15° | 1.5 mm | 7 | |
| 6 Sept. | Patchy rain possible | 27° /14° | 0.5 mm | 6 | |
| 7 Sept. | Sunny | 25° /15° | 9.1 mm | 7 | |
| 8 Sept. | Partly cloudy | 26° /15° | 7.1 mm | 6 | |
| 9 Sept. | Partly cloudy | 27° /15° | 0 mm | 7 | |
| 10 Sept. | Thundery outbreaks possible | 26° /13° | 0.6 mm | 6 | |
| 11 Sept. | Patchy rain possible | 22° /11° | 1.1 mm | 5 | |
| 12 Sept. | Fog | 20° /11° | 1.1 mm | 5 | |
| 13 Sept. | Overcast | 22° /10° | 0 mm | 6 | |
| 14 Sept. | Mist | 22° /8° | 0 mm | 6 | |
| 15 Sept. | Partly cloudy | 25° /10° | 0 mm | 7 | |
| 16 Sept. | Overcast | 25° /12° | 0.3 mm | 6 | |
| 17 Sept. | Light drizzle | 25° /13° | 1.4 mm | 6 | |
| 18 Sept. | Light rain shower | 24° /12° | 2.2 mm | 6 | |
| 19 Sept. | Overcast | 23° /12° | 0 mm | 6 | |
| 20 Sept. | Light drizzle | 24° /13° | 3.8 mm | 5 | |
| 21 Sept. | Light rain shower | 17° /11° | 8.3 mm | 4 | |
| 22 Sept. | Patchy rain possible | 20° /10° | 3.2 mm | 5 | |
| 23 Sept. | Overcast | 18° /9° | 4.3 mm | 4 | |
| 24 Sept. | Sunny | 20° /10° | 1.2 mm | 5 | |
| 25 Sept. | Patchy rain possible | 20° /11° | 6.7 mm | 5 | |
| 26 Sept. | Patchy rain possible | 22° /13° | 1.7 mm | 5 | |
| 27 Sept. | Overcast | 19° /10° | 1.3 mm | 4 | |
| 28 Sept. | Mist | 19° /9° | 0.8 mm | 5 | |
| 29 Sept. | Patchy rain possible | 18° /9° | 0.4 mm | 4 | |
| 30 Sept. | Sunny | 20° /10° | 0.3 mm | 5 | |
| Next | |||||
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 26° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Brittany during September?
In September, Brittany can expect light to moderate rainfall, totaling 41.1 mm across approximately 10 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Brittany during September?
The average wind speed in Brittany during September is 21 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
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- 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
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
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 ☀️
Provinces in Brittany
Select a province for an accurate weather forecast
Top locations in Brittany
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Brittany?Get accurate weather forecasts for Brittany, located at latitude 48.112 and longitude -1.674. Stay updated with localized weather information tailored for Brittany.
Found a mistake?
We appreciate your attention to details. Tell us here.