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 in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 103.9 mm.
Temperatures
Rain 🌧️
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° |
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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 | |
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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.
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Rotterdam in September - FAQ
September rainfall patterns in Rotterdam
UV exposure in Rotterdam during September
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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.