Rennes
September
Weather in Rennes for September 2025
Your guide to Rennes weather in September - trends and predictions
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 19.7 °C by the end of September.
Rennes sees moderate rainfall in September, averaging 10 rainy days.
Is September a good time to visit Rennes? check out the best time to travel to Rennes page.
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20
Dry days
10
Rainy days
0
Snow days
26°/14°
Temperatures
21 km/h
Avg max wind
67 %
Avg humidity
Rennes in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  24° | 3  27° | 4 27° | 5  27° | 6  27° | 7 25° |
| 8 26° | 9 27° | 10  26° | 11 22° | 12 20° | 13  22° | 14 22° |
| 15 25° | 16 25° | 17  25° | 18 24° | 19 23° | 20 24° | 21 17° |
| 22 20° | 23 18° | 24 20° | 25 20° | 26 22° | 27 19° | 28 19° |
| 29 18° | 30 20° |
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Temperatures trend during September in Rennes
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Moderate or heavy rain shower | 24° /16° | 7.4 mm | 6 | |
| 2 Sept. | Mist | 24° /12° | 0.5 mm | 6 | |
| 3 Sept. | Sunny | 27° /13° | 0.6 mm | 7 | |
| 4 Sept. | Sunny | 27° /15° | 0.9 mm | 7 | |
| 5 Sept. | Partly cloudy | 27° /15° | 1.5 mm | 7 | |
| 6 Sept. | Patchy rain possible | 27° /14° | 0.5 mm | 6 | |
| 7 Sept. | Sunny | 25° /15° | 9.1 mm | 7 | |
| 8 Sept. | Partly cloudy | 26° /15° | 7.1 mm | 6 | |
| 9 Sept. | Partly cloudy | 27° /15° | 0 mm | 7 | |
| 10 Sept. | Thundery outbreaks possible | 26° /13° | 0.6 mm | 6 | |
| 11 Sept. | Patchy rain possible | 22° /11° | 1.1 mm | 5 | |
| 12 Sept. | Fog | 20° /11° | 1.1 mm | 5 | |
| 13 Sept. | Overcast | 22° /10° | 0 mm | 6 | |
| 14 Sept. | Mist | 22° /8° | 0 mm | 6 | |
| 15 Sept. | Partly cloudy | 25° /10° | 0 mm | 7 | |
| 16 Sept. | Overcast | 25° /12° | 0.3 mm | 6 | |
| 17 Sept. | Light drizzle | 25° /13° | 1.4 mm | 6 | |
| 18 Sept. | Light rain shower | 24° /12° | 2.2 mm | 6 | |
| 19 Sept. | Overcast | 23° /12° | 0 mm | 6 | |
| 20 Sept. | Light drizzle | 24° /13° | 3.8 mm | 5 | |
| 21 Sept. | Light rain shower | 17° /11° | 8.3 mm | 4 | |
| 22 Sept. | Patchy rain possible | 20° /10° | 3.2 mm | 5 | |
| 23 Sept. | Overcast | 18° /9° | 4.3 mm | 4 | |
| 24 Sept. | Sunny | 20° /10° | 1.2 mm | 5 | |
| 25 Sept. | Patchy rain possible | 20° /11° | 6.7 mm | 5 | |
| 26 Sept. | Patchy rain possible | 22° /13° | 1.7 mm | 5 | |
| 27 Sept. | Overcast | 19° /10° | 1.3 mm | 4 | |
| 28 Sept. | Mist | 19° /9° | 0.8 mm | 5 | |
| 29 Sept. | Patchy rain possible | 18° /9° | 0.4 mm | 4 | |
| 30 Sept. | Sunny | 20° /10° | 0.3 mm | 5 | |
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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.
Rennes in September - FAQ
What are the expected maximum and minimum temperatures in Rennes 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 Rennes during September?
In September, Rennes 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 Rennes during September?
The average wind speed in Rennes during September is 21 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
- 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 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 ☀️
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