Rotterdam
September
Weather in Rotterdam for September 2026
Your guide to Rotterdam weather in September - trends and predictions
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Until now, September 2026 in Rotterdam is cooler than usual, with temperatures averaging 20.7 °C, this is 2.6 °C below the typical seasonal average.
Expect cooler weather in the next days in Rotterdam with the forecast suggesting a temperature of 21.4 °C, lower than the historical average.
In general, the average temperature in Rotterdam at the beginning of September is 24.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21 °C by the end of September.
The climate of Rotterdam in September is notably wet, with an average of 13 rainy days, and a total of 88.6 mm of precipitation.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
17
Dry days
13
Rainy days
0
Snow days
21°/13°
Temperatures
20 km/h
Avg max wind
70 %
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 | 23° /14° | 1.3 mm | 5 | |
| 2 Sept. |  Fog | 24° /15° | 2.8 mm | 4 | |
| 3 Sept. |  Partly cloudy | 23° /15° | 1.9 mm | 4 | |
| 4 Sept. | Light rain shower | 22° /15° | 1.8 mm | 4 | |
| 5 Sept. |  Sunny | 24° /14° | 0.3 mm | 6 | |
| 6 Sept. | Sunny | 26° /14° | 2.2 mm | 5 | |
| 7 Sept. | Sunny | 28° /15° | 0 mm | 6 | |
| 8 Sept. | Patchy rain possible | 23° /15° | 5.5 mm | 5 | |
| 9 Sept. |  Cloudy | 21° /14° | 3.2 mm | 4 | |
| 10 Sept. | Sunny | 23° /13° | 1.9 mm | 5 | |
| 11 Sept. | Light rain shower | 20° /13° | 5.8 mm | 4 | |
| 12 Sept. | Partly cloudy | 19° /12° | 8.8 mm | 4 | |
| 13 Sept. | Patchy rain possible | 21° /15° | 4.7 mm | 2.3 | |
| 14 Sept. | Sunny | 24° /13° | 0.1 mm | 4.1 | |
| 15 Sept. | Light rain shower | 23° /16° | 3 mm | 4.1 | |
| 16 Sept. | Patchy rain possible | 18° /13° | 3.6 mm | 3.1 | |
| 17 Sept. | Patchy rain possible | 18° /12° | 7.5 mm | 5 | |
| 18 Sept. | Patchy rain possible | 18° /13° | 1.4 mm | 4 | |
| 19 Sept. | Patchy rain possible | 19° /12° | 1.4 mm | 4 | |
| 20 Sept. |  Overcast | 19° /14° | 0.4 mm | 4 | |
| 21 Sept. | Sunny | 20° /14° | 0 mm | 5 | |
| 22 Sept. | Sunny | 22° /12° | 0 mm | 6 | |
| 23 Sept. | Overcast | 21° /15° | 0 mm | 6 | |
| 24 Sept. | Sunny | 23° /13° | 0 mm | 6 | |
| 25 Sept. | Sunny | 26° /15° | 0 mm | 7 | |
| 26 Sept. | Sunny | 27° /15° | 0 mm | 7 | |
| 27 Sept. | Partly cloudy | 19° /12° | 9 mm | 4 | |
| 28 Sept. | Patchy rain possible | 17° /11° | 1.3 mm | 4 | |
| 29 Sept. | Light rain shower | 18° /11° | 0.3 mm | 4 | |
| 30 Sept. | Cloudy | 17° /10° | 4.1 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.
Change Month
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 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Rotterdam during September?
Moderate rainfall is anticipated in Rotterdam during September, with a total of 88.6 mm spread over approximately 13 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Rotterdam during September?
The average wind speed in Rotterdam during September is 20 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 💧
Typically, Rotterdam has 13 rainy days in September with a total of 88.6 mm of rainfall.
UV exposure in Rotterdam during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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