Weather in Brittany for September 2026
Until now, September 2026 in Brittany is slightly cooler than the historical average by 1 °C.
The forecast for the next days in Brittany predicts temperatures to be around 21 °C, close to the historical average.
In general, the average temperature in Brittany at the beginning of September is 22.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17 °C by the end of September.
Brittany experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 86.7 mm.
Is September a good time to visit Brittany? check out the best time to travel to Brittany page.
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Brittany Weather September
What’s the Weather Like in Brittany This September?
Temperatures trend during September in Brittany
September weather in Brittany day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 21° /14° | 5.5 mm | 4 | |
| 2 Sept. |  Overcast | 20° /13° | 2.2 mm | 5 | |
| 3 Sept. |  Sunny | 22° /14° | 2.1 mm | 5 | |
| 4 Sept. |  Moderate rain at times | 22° /15° | 3.7 mm | 5 | |
| 5 Sept. | Patchy rain possible | 22° /14° | 1.8 mm | 5 | |
| 6 Sept. | Sunny | 25° /14° | 0.7 mm | 5 | |
| 7 Sept. | Patchy rain possible | 23° /15° | 6.4 mm | 5 | |
| 8 Sept. | Patchy rain possible | 20° /14° | 8.1 mm | 4 | |
| 9 Sept. | Patchy rain possible | 19° /13° | 2.3 mm | 4 | |
| 10 Sept. | Patchy rain possible | 19° /13° | 1.2 mm | 4 | |
| 11 Sept. | Patchy rain possible | 20° /13° | 1.5 mm | 4 | |
| 12 Sept. | Sunny | 21° /14° | 0 mm | 5.2 | |
| 13 Sept. | Overcast | 23° /16° | 0 mm | 5.1 | |
| 14 Sept. | Sunny | 26° /17° | 0 mm | 5.1 | |
| 15 Sept. | Sunny | 19° /14° | 0.1 mm | 5 | |
| 16 Sept. | Patchy rain possible | 17° /13° | 0.4 mm | 5 | |
| 17 Sept. | Patchy rain possible | 18° /13° | 1.2 mm | 5 | |
| 18 Sept. | Sunny | 19° /12° | 0 mm | 5 | |
| 19 Sept. | Sunny | 24° /12° | 0 mm | 6 | |
| 20 Sept. | Sunny | 28° /16° | 0 mm | 7 | |
| 21 Sept. | Sunny | 22° /15° | 2.7 mm | 5 | |
| 22 Sept. | Patchy rain possible | 18° /13° | 4.9 mm | 5 | |
| 23 Sept. | Light rain shower | 18° /14° | 17.9 mm | 4 | |
| 24 Sept. | Sunny | 17° /14° | 3.4 mm | 5 | |
| 25 Sept. | Patchy rain possible | 18° /13° | 3.2 mm | 4 | |
| 26 Sept. |  Cloudy | 17° /11° | 2.6 mm | 4 | |
| 27 Sept. | Moderate rain at times | 17° /11° | 3.6 mm | 4 | |
| 28 Sept. | Patchy rain possible | 16° /11° | 2 mm | 4 | |
| 29 Sept. | Patchy rain possible | 17° /10° | 0.9 mm | 4 | |
| 30 Sept. | Sunny | 17° /10° | 1.4 mm | 4 | |
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Brittany weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 21°/14° | 19°/13° | 16°/11° |
| Rainfall | 52 mm | 87 mm | 96 mm |
| Wind | 22.7 km/h | 24.1 km/h | 26.7 km/h |
| Humidity | 76% | 78% | 80% |
| Rainy days | 21 days | 25 days | 25 days |
| Dry days | 10 days | 5 days | 6 days |
Planning a trip to Brittany? Discover the best time to visit
Brittany in September - FAQ
What are the expected maximum and minimum temperatures in Brittany during September?
How much rainfall should be expected in Brittany during September?
What are the typical wind conditions in Brittany during September?
September rainfall patterns in Brittany
UV exposure in Brittany during September
What to pack to Brittany in September?
Mild · highs around 19 °C, frequent showers
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
👟 Footwear
🎒 Accessories
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Where is Brittany?Get accurate weather forecasts for Brittany, located at latitude 48.39 and longitude -4.486. Stay updated with localized weather information tailored for Brittany.