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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.
Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/14°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Brittany in September average weather

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Temperatures trend during September in Brittany

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
24° /16° 7.4 mm 6
2 Sept. Mist
Mist
24° /12° 0.5 mm 6
3 Sept. Sunny
Sunny
27° /13° 0.6 mm 7
4 Sept. Sunny
Sunny
27° /15° 0.9 mm 7
5 Sept. Partly cloudy
Partly cloudy
27° /15° 1.5 mm 7
6 Sept. Patchy rain possible
Patchy rain possible
27° /14° 0.5 mm 6
7 Sept. Sunny
Sunny
25° /15° 9.1 mm 7
8 Sept. Partly cloudy
Partly cloudy
26° /15° 7.1 mm 6
9 Sept. Partly cloudy
Partly cloudy
27° /15° 0 mm 7
10 Sept. Thundery outbreaks possible
Thundery outbreaks possible
26° /13° 0.6 mm 6
11 Sept. Patchy rain possible
Patchy rain possible
22° /11° 1.1 mm 5
12 Sept. Fog
Fog
20° /11° 1.1 mm 5
13 Sept. Overcast
Overcast
22° /10° 0 mm 6
14 Sept. Mist
Mist
22° /8° 0 mm 6
15 Sept. Partly cloudy
Partly cloudy
25° /10° 0 mm 7
16 Sept. Overcast
Overcast
25° /12° 0.3 mm 6
17 Sept. Light drizzle
Light drizzle
25° /13° 1.4 mm 6
18 Sept. Light rain shower
Light rain shower
24° /12° 2.2 mm 6
19 Sept. Overcast
Overcast
23° /12° 0 mm 6
20 Sept. Light drizzle
Light drizzle
24° /13° 3.8 mm 5
21 Sept. Light rain shower
Light rain shower
17° /11° 8.3 mm 4
22 Sept. Patchy rain possible
Patchy rain possible
20° /10° 3.2 mm 5
23 Sept. Overcast
Overcast
18° /9° 4.3 mm 4
24 Sept. Sunny
Sunny
20° /10° 1.2 mm 5
25 Sept. Patchy rain possible
Patchy rain possible
20° /11° 6.7 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
22° /13° 1.7 mm 5
27 Sept. Overcast
Overcast
19° /10° 1.3 mm 4
28 Sept. Mist
Mist
19° /9° 0.8 mm 5
29 Sept. Patchy rain possible
Patchy rain possible
18° /9° 0.4 mm 4
30 Sept. Sunny
Sunny
20° /10° 0.3 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 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 ☀️
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Location coordinates 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.

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