Seine-Maritime
September
Weather in Seine-Maritime for September 2025
Your guide to Seine-Maritime weather in September - trends and predictions
In general, the average temperature in Seine-Maritime at the beginning of September is 25 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.1 °C by the end of September.
The climate of Seine-Maritime in September is notably wet, with an average of 11 rainy days.
Is September a good time to visit Seine-Maritime? check out the best time to travel to Seine-Maritime page.
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19
Dry days
11
Rainy days
0
Snow days
24°/14°
Temperatures
18 km/h
Avg max wind
70 %
Avg humidity
Seine-Maritime in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  26° | 2  23° | 3  26° | 4 23° | 5  23° | 6 27° | 7 27° |
| 8 24° | 9  24° | 10 24° | 11 19° | 12  18° | 13  18° | 14 21° |
| 15 23° | 16 23° | 17 23° | 18 23° | 19 22° | 20 23° | 21 20° |
| 22 17° | 23 18° | 24 19° | 25 17° | 26 21° | 27 18° | 28 17° |
| 29 17° | 30 18° |
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Temperatures trend during September in Seine-Maritime
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 | 26° /17° | 15.4 mm | 6 | |
| 2 Sept. | Patchy rain possible | 23° /15° | 1 mm | 6 | |
| 3 Sept. | Sunny | 26° /14° | 0.1 mm | 6 | |
| 4 Sept. | Sunny | 23° /13° | 0.8 mm | 6 | |
| 5 Sept. | Cloudy | 23° /14° | 3.3 mm | 5 | |
| 6 Sept. | Sunny | 27° /16° | 0.3 mm | 7 | |
| 7 Sept. | Sunny | 27° /15° | 2.6 mm | 7 | |
| 8 Sept. | Sunny | 24° /15° | 10.5 mm | 6 | |
| 9 Sept. | Partly cloudy | 24° /15° | 0.4 mm | 6 | |
| 10 Sept. | Partly cloudy | 24° /14° | 0.8 mm | 6 | |
| 11 Sept. | Light rain shower | 19° /11° | 2.8 mm | 5 | |
| 12 Sept. | Overcast | 18° /10° | 1.5 mm | 4 | |
| 13 Sept. | Mist | 18° /10° | 0.4 mm | 5 | |
| 14 Sept. | Cloudy | 21° /11° | 0 mm | 5 | |
| 15 Sept. | Sunny | 23° /10° | 0 mm | 6 | |
| 16 Sept. | Partly cloudy | 23° /13° | 0.1 mm | 6 | |
| 17 Sept. | Light rain shower | 23° /13° | 0.7 mm | 6 | |
| 18 Sept. | Light rain shower | 23° /13° | 3.2 mm | 6 | |
| 19 Sept. | Overcast | 22° /12° | 0 mm | 6 | |
| 20 Sept. | Patchy rain possible | 23° /13° | 0.9 mm | 5 | |
| 21 Sept. | Light rain shower | 20° /12° | 8.9 mm | 5 | |
| 22 Sept. | Light rain shower | 17° /12° | 6.4 mm | 4 | |
| 23 Sept. | Patchy rain possible | 18° /9° | 1.7 mm | 5 | |
| 24 Sept. | Sunny | 19° /10° | 5.6 mm | 5 | |
| 25 Sept. | Patchy rain possible | 17° /11° | 8.9 mm | 4 | |
| 26 Sept. | Light rain shower | 21° /13° | 2.7 mm | 5 | |
| 27 Sept. | Partly cloudy | 18° /12° | 1.3 mm | 5 | |
| 28 Sept. | Mist | 17° /8° | 0.1 mm | 4 | |
| 29 Sept. | Light rain shower | 17° /8° | 0.6 mm | 4 | |
| 30 Sept. | Sunny | 18° /10° | 0.8 mm | 5 | |
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Important Notice
Our weather forecast for Seine-Maritime 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 Seine-Maritime forecast closer to your planned date for the most up-to-date weather information.
Seine-Maritime in September - FAQ
What are the expected maximum and minimum temperatures in Seine-Maritime during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Seine-Maritime during September?
Moderate rainfall is anticipated in Seine-Maritime during September, with a total of 58.4 mm spread over approximately 11 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Seine-Maritime during September?
The average wind speed in Seine-Maritime during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Seine-Maritime in September?
As you prepare for your trip to Seine-Maritime 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 Seine-Maritime, 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 Seine-Maritime
Explore the daily rainfall trends and prepare for Seine-Maritimes September weather 💧
UV exposure in Seine-Maritime during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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