Rotterdam Weather in September
September in Rotterdam brings pleasant temperatures, with daytime highs of 20°C (68°F) and nights around 12°C (54°F). Quite a bit of rainfall is expected, around 79 mm (3.1 in), so pack an umbrella.
Rainfall in Rotterdam in September
On average, there are about 15 days with rain during this month, averaging 79 mm (3.1 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Rotterdam in September
September is a perfect month in Rotterdam, with 20°C (68°F) during the day and 12°C (54°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Rotterdam in September
The month experiences a moderate amount of sunlight, with 154 hours of sunshine. This provides a nice balance between sunshine and clouds.
Wind Speed in Rotterdam in September
Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the Netherlands, check out our Rotterdam's climate page.
Rotterdam Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
20°C (68°F)
Chance of Rain
51%
Precipitation
79 mm (3.1 in)
Rainy days
15 days
Humidity
84%
Windspeed
4 m/s (8 knots)
Sunshine
154 hours
Percentage Sunshine
34%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Rotterdam typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 13°C (55°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Rotterdam in September
Browse day-by-day weather records for Rotterdam spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Rotterdam historical weather extremes in September
The extremes listed below come from historical weather data collected in Rotterdam from 1976 through 2025.
- Rotterdam recorded its highest September temperature of 32°C (90°F) on September 15, 2020.
- Rotterdam experienced its chilliest September day on September 22, 1996, reaching only 10°C (50°F).
- Rotterdam registered its coldest September night on September 19, 1986, with temperatures dropping to 1°C (34°F).
Best Places in the Netherlands in September
Find out more about the weather in the Netherlands and which places have the best travel conditions in this month. See all of the Netherlands in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Rotterdam in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Rotterdam in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the Netherlands, check out our Rotterdam's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Rotterdam climate overview or explore weather in the Netherlands.
