Weather in Rotterdam for September 2025
In general, the average temperature in Rotterdam at the beginning of September is 25.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.9 °C by the end of September.
Rotterdam sees moderate rainfall in September, averaging 9 rainy days.
Is September a good time to visit Rotterdam? check out the best time to travel to Rotterdam page.
- New! Chat with our AI weatherman - it’s amazing and free.
Rotterdam in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2  25° | 3  24° | 4  22° | 5 28° | 6 27° | 7 27° |
| 8 26° | 9  24° | 10 24° | 11 20° | 12 19° | 13 18° | 14 19° |
| 15 22° | 16 22° | 17  22° | 18 22° | 19 21° | 20 22° | 21 22° |
| 22 19° | 23 17° | 24 18° | 25 18° | 26 20° | 27 19° | 28 16° |
| 29 17° | 30 17° |
You can click on date
Temperatures trend during September in Rotterdam
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 25° /14° | 2.6 mm | 6 | |
| 2 Sept. | Fog | 25° /17° | 3.3 mm | 6 | |
| 3 Sept. | Partly cloudy | 24° /16° | 0.5 mm | 6 | |
| 4 Sept. | Sunny | 22° /15° | 1.1 mm | 6 | |
| 5 Sept. | Sunny | 28° /14° | 0.5 mm | 7 | |
| 6 Sept. | Sunny | 27° /17° | 4.3 mm | 7 | |
| 7 Sept. | Sunny | 27° /16° | 0 mm | 7 | |
| 8 Sept. | Sunny | 26° /16° | 2.4 mm | 6 | |
| 9 Sept. | Cloudy | 24° /17° | 1.7 mm | 5 | |
| 10 Sept. | Sunny | 24° /16° | 3.7 mm | 6 | |
| 11 Sept. | Patchy rain possible | 20° /14° | 6.5 mm | 5 | |
| 12 Sept. | Partly cloudy | 19° /12° | 10.6 mm | 5 | |
| 13 Sept. | Cloudy | 18° /10° | 2 mm | 5 | |
| 14 Sept. | Partly cloudy | 19° /11° | 0 mm | 5 | |
| 15 Sept. | Partly cloudy | 22° /11° | 0 mm | 5 | |
| 16 Sept. | Partly cloudy | 22° /13° | 0.5 mm | 5 | |
| 17 Sept. | Overcast | 22° /14° | 0 mm | 5 | |
| 18 Sept. | Light rain shower | 22° /15° | 4.8 mm | 6 | |
| 19 Sept. | Patchy rain possible | 21° /14° | 1.7 mm | 5 | |
| 20 Sept. | Patchy rain possible | 22° /13° | 0.2 mm | 6 | |
| 21 Sept. | Light rain shower | 22° /13° | 7.3 mm | 6 | |
| 22 Sept. | Light rain shower | 19° /12° | 4.8 mm | 5 | |
| 23 Sept. | Light rain shower | 17° /12° | 8.1 mm | 4 | |
| 24 Sept. | Sunny | 18° /10° | 0.9 mm | 5 | |
| 25 Sept. | Overcast | 18° /11° | 4 mm | 5 | |
| 26 Sept. | Overcast | 20° /13° | 10.2 mm | 5 | |
| 27 Sept. | Partly cloudy | 19° /13° | 13.4 mm | 5 | |
| 28 Sept. | Patchy rain possible | 16° /12° | 2 mm | 4 | |
| 29 Sept. | Light rain shower | 17° /10° | 0.5 mm | 4 | |
| 30 Sept. | Cloudy | 17° /10° | 6.1 mm | 4 | |
| Next | |||||
Guide for Rotterdam in September
In September, Rotterdam, Netherlands experiences a transition from late summer to early autumn. At the beginning of the month, the weather in Rotterdam is generally mild and pleasant, with average temperatures around 17°.
The city enjoys around 5 hours of sunshine per day, and the chance of rainfall is moderate, with occasional light showers. The average sea temperature is around 17°, making it suitable for outdoor activities along the coast.
As the month progresses, the weather gradually cools down, and by the end of September, the average temperatures in Rotterdam drop to around 14°. The days become shorter, with approximately 4 hours of sunshine per day.
The likelihood of rainfall increases towards the end of the month, and visitors should be prepared for overcast skies and intermittent showers. The sea temperature also decreases slightly, reaching around 16°.
Overall, September in Rotterdam offers a mix of comfortable temperatures and changing weather patterns as the city transitions from summer to autumn.
Visitors can enjoy outdoor activities at the beginning of the month, but should be prepared for cooler and potentially wetter conditions towards the end of September.
Rotterdam in September - FAQ
What to pack to Rotterdam in September?
As you prepare for your trip to Rotterdam 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 Rotterdam, 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 Rotterdam
UV exposure in Rotterdam during September
Quick links
Where is Rotterdam?Get accurate weather forecasts for Rotterdam, located at latitude 51.923 and longitude 4.479. Stay updated with localized weather information tailored for Rotterdam.