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Weather in Rennes for September 2025

Your guide to Rennes weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Rennes is cooler than usual, with temperatures averaging 21.9 °C, this is -2.9 °C below the typical seasonal average.

  • The forecast for the next days in Rennes predicts a temperature of 20.6 °C, which is cooler than the historical average.

  • In general, the average temperature in Rennes at the beginning of September is 25.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.7 °C by the end of September.

    • Rain 🌧️

  • Rennes 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 Rennes? check out the best time to travel to Rennes 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

Rennes 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
24°
16
Cloudy
21°
17
Sunny
25°
18
Sunny
29°
19
Partly cloudy
31°
20
Patchy rain possible
20°
21
Mist
19°
22
Patchy rain possible
16°
23
Partly cloudy
17°
24
Sunny
18°
25
Sunny
19°
26
Sunny
20°
27
Sunny
19°
28
Patchy rain possible
18°
29
Patchy rain possible
17°
30
Patchy rain possible
20°

Temperatures trend during September in Rennes

See the weather trend as well as the moving average line

September weather in Rennes 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
 24° /11° 0.2 mm 6
16 Sept. Cloudy
Cloudy
 21° /10° 0.1 mm 0.8
17 Sept. Sunny
Sunny
 25° /12° 0 mm 1.2
18 Sept. Sunny
Sunny
 29° /11° 0 mm 1.2
19 Sept. Partly cloudy
Partly cloudy
 31° /15° 0 mm 1
20 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 2.8 mm 0.1
21 Sept. Mist
Mist
 19° /9° 0.1 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 16° /8° 0.5 mm 3
23 Sept. Partly cloudy
Partly cloudy
 17° /10° 0.1 mm 4
24 Sept. Sunny
Sunny
 18° /7° 0 mm 4
25 Sept. Sunny
Sunny
 19° /6° 0 mm 4
26 Sept. Sunny
Sunny
 20° /6° 0 mm 4
27 Sept. Sunny
Sunny
 19° /7° 0 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 18° /7° 0.2 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 2.8 mm 3
30 Sept. Patchy rain possible
Patchy rain possible
 20° /8° 0.9 mm 5
Next
Important Notice
Our weather forecast for Rennes 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 Rennes forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Rennes weather in September vs August vs October

Compare September weather in Rennes 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 Rennes? Discover the best time to visit

Rennes in September - FAQ

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

What to pack to Rennes in September?

As you prepare for your trip to Rennes 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 Rennes, 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 Rennes

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

UV exposure in Rennes during September

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

Quick links

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Location coordinates Where is Rennes?

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

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