Rotterdam
September
Weather in Rotterdam for September 2025
Your guide to Rotterdam weather in September - trends and predictions
Moderate Wind Warning - See hour by hour.
Until now, September 2025 in Rotterdam is slightly cooler than the historical average by -1.6 °C.
Expect cooler weather in the next days in Rotterdam with the forecast suggesting a temperature of 19.2 °C, lower than the historical average.
In general, the average temperature in Rotterdam at the beginning of September is 24.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.1 °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.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
10
Dry days
20
Rainy days
0
Snow days
21°/14°
Temperatures
18 km/h
Avg max wind
71 %
Avg humidity
Rotterdam Weather September
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Temperatures trend during September in Rotterdam
See the weather trend as well as the moving average line
September weather in Rotterdam day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 24° /14° | 1.8 mm | 5 | |
| 2 Sept. |  Fog | 24° /16° | 3.5 mm | 5 | |
| 3 Sept. |  Partly cloudy | 24° /15° | 1.8 mm | 5 | |
| 4 Sept. | Light rain shower | 22° /14° | 1.1 mm | 5 | |
| 5 Sept. |  Sunny | 26° /14° | 0.4 mm | 6 | |
| 6 Sept. | Sunny | 26° /15° | 2.9 mm | 6 | |
| 7 Sept. | Sunny | 28° /15° | 0 mm | 7 | |
| 8 Sept. | Patchy rain possible | 25° /15° | 1.9 mm | 6 | |
| 9 Sept. |  Cloudy | 22° /15° | 2.4 mm | 5 | |
| 10 Sept. | Sunny | 24° /14° | 2.5 mm | 6 | |
| 11 Sept. | Light rain shower | 20° /14° | 6.3 mm | 4 | |
| 12 Sept. | Partly cloudy | 18° /12° | 10 mm | 4 | |
| 13 Sept. | Light rain shower | 17° /10° | 3.8 mm | 4 | |
| 14 Sept. | Partly cloudy | 19° /11° | 0 mm | 5 | |
| 15 Sept. | Patchy rain possible | 19° /14° | 4.8 mm | 1 | |
| 16 Sept. | Patchy rain possible | 16° /14° | 2.4 mm | 0.5 | |
| 17 Sept. | Patchy rain possible | 17° /14° | 2.2 mm | 0.5 | |
| 18 Sept. | Patchy rain possible | 22° /16° | 0.2 mm | 0.5 | |
| 19 Sept. | Partly cloudy | 20° /14° | 0 mm | 5 | |
| 20 Sept. | Sunny | 26° /13° | 0 mm | 5 | |
| 21 Sept. | Patchy rain possible | 23° /18° | 0.4 mm | 4 | |
| 22 Sept. | Patchy rain possible | 18° /14° | 0.2 mm | 4 | |
| 23 Sept. | Patchy rain possible | 19° /13° | 0.1 mm | 4 | |
| 24 Sept. | Partly cloudy | 18° /11° | 0 mm | 4 | |
| 25 Sept. | Sunny | 18° /9° | 0 mm | 4 | |
| 26 Sept. | Patchy rain possible | 19° /10° | 0.3 mm | 3 | |
| 27 Sept. |  Moderate rain | 15° /12° | 6.1 mm | 3 | |
| 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 | |||||
Important Notice
Our weather forecast for Rotterdam 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 Rotterdam forecast closer to your planned date for the most up-to-date weather information.
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Rotterdam in September - FAQ
What are the expected maximum and minimum temperatures in Rotterdam during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Rotterdam during September?
Significant rainfall exceeding 103.9 mm is expected in Rotterdam during September, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Rotterdam during September?
The average wind speed in Rotterdam during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Rotterdam
Explore the daily rainfall trends and prepare for Rotterdams September weather 💧
UV exposure in Rotterdam during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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