Rotterdam weather in September
September in Rotterdam: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Rotterdam · #321 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Rotterdam in September
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Rotterdam climate normals — September
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Rainfall | 66 mm / 2.6 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 9 h/day | |
| Daylight | 12.6 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Rotterdam in September — FAQ
- Is September a good time to visit Rotterdam?
- September in Rotterdam: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Rotterdam on SeasonMap's comfort score (87/100).
- What is the weather like in Rotterdam in September?
- In September, Rotterdam averages a daily high of 19.9°C and a low of 12.8°C, with about 66 mm of rain over roughly 10.6 rainy days.
- What is the air quality in Rotterdam in September?
- Rotterdam has a mean US Air Quality Index of about 50 in September.