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Weather in Brest for September 2025

Your guide to Brest weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Brest is cooler than usual, with temperatures averaging 18.1 °C, this is -2.8 °C below the typical seasonal average.

  • The forecast for the next days in Brest predicts a temperature of 16.6 °C, which is cooler than the historical average.

  • In general, the average temperature in Brest at the beginning of September is 22 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.4 °C by the end of September.

    • Rain 🌧️

  • Brest experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 86.2 mm.

    • More

  • Is September a good time to visit Brest? check out the best time to travel to Brest page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
8
Dry days
Average rainy days
22
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/13°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Brest Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
21°
2
Partly cloudy
20°
3
Sunny
22°
4
Moderate rain at times
22°
5
Patchy rain possible
22°
6
Sunny
24°
7
Patchy rain possible
23°
8
Patchy rain possible
20°
9
Patchy rain possible
20°
10
Patchy rain possible
19°
11
Patchy rain possible
20°
12
Patchy rain possible
19°
13
Patchy rain possible
20°
14
Sunny
20°
15
Partly cloudy
20°
16
Patchy rain possible
16°
17
Partly cloudy
18°
18
Partly cloudy
19°
19
Sunny
19°
20
Patchy rain possible
16°
21
Patchy rain possible
13°
22
Patchy rain possible
14°
23
Patchy rain possible
13°
24
Patchy rain possible
16°
25
Patchy rain possible
16°
26
Partly cloudy
17°
27
Partly cloudy
18°
28
Sunny
19°
29
Patchy rain possible
19°
30
Patchy rain possible
17°

Temperatures trend during September in Brest

See the weather trend as well as the moving average line

September weather in Brest day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 21° /14° 6.6 mm 5
2 Sept. Partly cloudy
Partly cloudy
 20° /13° 2.6 mm 5
3 Sept. Sunny
Sunny
 22° /13° 2.5 mm 5
4 Sept. Moderate rain at times
Moderate rain at times
 22° /15° 4.4 mm 5
5 Sept. Patchy rain possible
Patchy rain possible
 22° /14° 2.2 mm 5
6 Sept. Sunny
Sunny
 24° /14° 0.9 mm 5
7 Sept. Patchy rain possible
Patchy rain possible
 23° /15° 7.6 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 20° /15° 7.5 mm 4
9 Sept. Patchy rain possible
Patchy rain possible
 20° /14° 2.6 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 1.4 mm 4
11 Sept. Patchy rain possible
Patchy rain possible
 20° /13° 1.5 mm 4
12 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 1.4 mm 4
13 Sept. Patchy rain possible
Patchy rain possible
 20° /13° 3.1 mm 5
14 Sept. Sunny
Sunny
 20° /12° 3.1 mm 5
15 Sept. Partly cloudy
Partly cloudy
 20° /11° 0 mm 5
16 Sept. Patchy rain possible
Patchy rain possible
 16° /14° 0.7 mm 0.8
17 Sept. Partly cloudy
Partly cloudy
 18° /15° 0 mm 1.2
18 Sept. Partly cloudy
Partly cloudy
 19° /15° 0.1 mm 1.2
19 Sept. Sunny
Sunny
 19° /14° 0 mm 1.1
20 Sept. Patchy rain possible
Patchy rain possible
 16° /13° 4.9 mm 0.3
21 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 1.2 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 14° /9° 0.5 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 2 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 16° /12° 0.1 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 0 mm 3
26 Sept. Partly cloudy
Partly cloudy
 17° /10° 0 mm 4
27 Sept. Partly cloudy
Partly cloudy
 18° /12° 0 mm 4
28 Sept. Sunny
Sunny
 19° /12° 0 mm 4
29 Sept. Patchy rain possible
Patchy rain possible
 19° /14° 0.2 mm 4
30 Sept. Patchy rain possible
Patchy rain possible
 17° /10° 1.7 mm 4
Next
Important Notice
Our weather forecast for Brest 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 Brest forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Brest weather in September vs August vs October

Compare September weather in Brest with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures21°/14°19°/13°17°/11°
Rainfall55 mm86 mm104 mm
Wind22.7 km/h23.4 km/h26.5 km/h
Humidity78%77%81%
Rainy days20 days22 days25 days
Dry days11 days8 days6 days

Planning a trip to Brest? Discover the best time to visit

Brest in September - FAQ

What are the expected maximum and minimum temperatures in Brest during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Brest during September?
Moderate rainfall is anticipated in Brest during September, with a total of 86.2 mm spread over approximately 22 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Brest during September?
The average wind speed in Brest during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Brest in September?

As you prepare for your trip to Brest 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 Brest, 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
    • 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 Brest

Explore the daily rainfall trends and prepare for Brests September weather 💧

UV exposure in Brest during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Get accurate weather forecasts for Brest, located at latitude 48.39 and longitude -4.486. Stay updated with localized weather information tailored for Brest.

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