Monthly climate guide
Rotterdam weather in September
September in Rotterdam is typically mild, with average daytime highs around 19°C (66°F) and night-time lows near 13°C (56°F). The month usually brings about 69 mm of rain (some rain) and is often cloudy. Daytime highs are 3°C cooler than August and 4°C warmer than October.
What stands out in September
- Comfortable temperatures make it easy to walk between Erasmus Bridge and Cube Houses.
- Just 150 km apart, but Rotterdam runs about 2°C cooler than Maastricht this month.
- September brings early autumn to Rotterdam.
- Only 2 months are warmer in Rotterdam than September.
Avg high
19°C
66°F
Avg low
13°C
56°F
Rainfall
69 mm
some rain
Humidity
79%
relative
Sky
59%
cloud · often cloudy
Rotterdam weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 6°C / 43°F | 3°C / 37°F | 77 mm | 91% | 74% |
| February | 6°C / 43°F | 2°C / 35°F | 61 mm | 89% | 68% |
| March | 9°C / 48°F | 3°C / 38°F | 51 mm | 86% | 63% |
| April | 13°C / 55°F | 6°C / 43°F | 36 mm | 81% | 61% |
| May | 16°C / 61°F | 9°C / 49°F | 50 mm | 79% | 64% |
| June | 19°C / 66°F | 13°C / 55°F | 70 mm | 79% | 67% |
| July | 21°C / 70°F | 15°C / 59°F | 76 mm | 77% | 64% |
| August | 22°C / 71°F | 15°C / 60°F | 76 mm | 76% | 61% |
| September | 19°C / 66°F | 13°C / 56°F | 69 mm | 79% | 59% |
| October | 15°C / 59°F | 10°C / 50°F | 85 mm | 85% | 68% |
| November | 10°C / 50°F | 6°C / 43°F | 69 mm | 89% | 70% |
| December | 8°C / 46°F | 4°C / 40°F | 92 mm | 91% | 75% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
Is September a good time to visit Rotterdam?
Our Rotterdam guide recommends: May to September for the warmest, driest weather.
Rotterdam is one of Europe's most bike-friendly cities — renting one is an easy way to cover its spread-out modern landmarks.
Best time to visit Rotterdam →Other Netherlands cities in September
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Rotterdam weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/netherlands/rotterdam/september
<a href="https://weathercompare.eu/weather/netherlands/rotterdam/september">Rotterdam weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/netherlands/rotterdam" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Rotterdam weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/netherlands/rotterdam/september">Rotterdam weather in September</a> – WeatherCompare</p>
Rotterdam in September: quick answers
Is September a good time to visit Rotterdam?
Yes. September is one of the best months for Rotterdam, with highs around 19°C and about 69 mm of rain.
How warm is Rotterdam in September?
Average highs are about 19°C (66°F) and average lows about 13°C (56°F), based on 10 years of daily data.
Does it rain a lot in Rotterdam in September?
Rotterdam typically gets around 69 mm of rain in September — some rain.
When is the best time to visit Rotterdam?
May to September for the warmest, driest weather.
Figures are long-term averages for the area around Rotterdam (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.