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Weather in Ille-et-Vilaine for September 2025

Your guide to Ille-et-Vilaine weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Ille-et-Vilaine is cooler than usual, with temperatures averaging 21.7 °C, this is -3 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Ille-et-Vilaine with the forecast suggesting a temperature of 21.3 °C, lower than the historical average.

  • In general, the average temperature in Ille-et-Vilaine at the beginning of September is 25.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.6 °C by the end of September.

    • Rain 🌧️

  • Ille-et-Vilaine experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 69.4 mm.

    • More

  • Is September a good time to visit Ille-et-Vilaine? check out the best time to travel to Ille-et-Vilaine page.

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

Average dry days
9
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/12°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Ille-et-Vilaine Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
24°
2
Sunny
25°
3
Light rain shower
26°
4
Light rain shower
26°
5
Partly cloudy
27°
6
Patchy rain possible
27°
7
Partly cloudy
26°
8
Moderate or heavy rain shower
24°
9
Patchy rain possible
24°
10
Overcast
24°
11
Partly cloudy
23°
12
Partly cloudy
23°
13
Partly cloudy
24°
14
Moderate or heavy rain shower
24°
15
Patchy rain possible
23°
16
Patchy rain possible
23°
17
Sunny
25°
18
Sunny
28°
19
Patchy rain possible
33°
20
Patchy rain possible
26°
21
Partly cloudy
20°
22
Patchy rain possible
18°
23
Partly cloudy
18°
24
Partly cloudy
17°
25
Sunny
19°
26
Patchy rain possible
17°
27
Patchy rain possible
16°
28
Sunny
19°
29
Sunny
20°
30
Sunny
22°

Temperatures trend during September in Ille-et-Vilaine

See the weather trend as well as the moving average line

September weather in Ille-et-Vilaine 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
 24° /14° 5.8 mm 6
2 Sept. Sunny
Sunny
 25° /12° 2.9 mm 6
3 Sept. Light rain shower
Light rain shower
 26° /13° 0.9 mm 6
4 Sept. Light rain shower
Light rain shower
 26° /14° 1.1 mm 6
5 Sept. Partly cloudy
Partly cloudy
 27° /14° 1 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 27° /14° 1.4 mm 6
7 Sept. Partly cloudy
Partly cloudy
 26° /15° 5.5 mm 6
8 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 24° /14° 7.8 mm 6
9 Sept. Patchy rain possible
Patchy rain possible
 24° /13° 2.2 mm 6
10 Sept. Overcast
Overcast
 24° /13° 0.5 mm 5
11 Sept. Partly cloudy
Partly cloudy
 23° /11° 0.5 mm 6
12 Sept. Partly cloudy
Partly cloudy
 23° /11° 0.5 mm 5
13 Sept. Partly cloudy
Partly cloudy
 24° /12° 3.1 mm 6
14 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 24° /12° 2.6 mm 6
15 Sept. Patchy rain possible
Patchy rain possible
 23° /11° 0.2 mm 5
16 Sept. Patchy rain possible
Patchy rain possible
 23° /11° 0.2 mm 5
17 Sept. Sunny
Sunny
 25° /12° 0 mm 1.3
18 Sept. Sunny
Sunny
 28° /12° 0 mm 1.2
19 Sept. Patchy rain possible
Patchy rain possible
 33° /14° 0.2 mm 1.1
20 Sept. Patchy rain possible
Patchy rain possible
 26° /12° 0.3 mm 0.9
21 Sept. Partly cloudy
Partly cloudy
 20° /9° 0 mm 0.6
22 Sept. Patchy rain possible
Patchy rain possible
 18° /8° 0.1 mm 3
23 Sept. Partly cloudy
Partly cloudy
 18° /9° 0 mm 4
24 Sept. Partly cloudy
Partly cloudy
 17° /8° 0 mm 4
25 Sept. Sunny
Sunny
 19° /6° 0 mm 4
26 Sept. Patchy rain possible
Patchy rain possible
 17° /6° 0.1 mm 3
27 Sept. Patchy rain possible
Patchy rain possible
 16° /7° 0.2 mm 3
28 Sept. Sunny
Sunny
 19° /5° 0 mm 4
29 Sept. Sunny
Sunny
 20° /6° 0 mm 4
30 Sept. Sunny
Sunny
 22° /9° 0 mm 4
Next
Important Notice
Our weather forecast for Ille-et-Vilaine 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 Ille-et-Vilaine forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Ille-et-Vilaine weather in September vs August vs October

Compare September weather in Ille-et-Vilaine 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
Temperatures25°/13°23°/12°18°/10°
Rainfall45 mm69 mm96 mm
Wind19.9 km/h20.3 km/h21.7 km/h
Humidity67%70%77%
Rainy days12 days21 days25 days
Dry days19 days9 days6 days

Planning a trip to Ille-et-Vilaine? Discover the best time to visit

Ille-et-Vilaine in September - FAQ

What are the expected maximum and minimum temperatures in Ille-et-Vilaine 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 Ille-et-Vilaine during September?
Moderate rainfall is anticipated in Ille-et-Vilaine 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 Ille-et-Vilaine during September?
The average wind speed in Ille-et-Vilaine during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Ille-et-Vilaine in September?

As you prepare for your trip to Ille-et-Vilaine 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 Ille-et-Vilaine, 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 Ille-et-Vilaine

Explore the daily rainfall trends and prepare for Ille-et-Vilaines September weather 💧

UV exposure in Ille-et-Vilaine during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Ille-et-Vilaine?

Get accurate weather forecasts for Ille-et-Vilaine, located at latitude 48.112 and longitude -1.674. Stay updated with localized weather information tailored for Ille-et-Vilaine.

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