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Rotterdam — weather in September, water temperature

By months January February March April May June July August September October November December
18.8°C Daytime temperatures 14°C Night temperatures 10 Sunny days 11.7-13.6 Sun (hours) 4 Rainy days 48.3 mm Precipitation 18.1°C water temperature
Air temperature
2022 2021 2020 2019 2018 2017 2016 2015 2014 2013
The maximum daily temperature 30°C — 5 September 2022.
The maximum night temperature 20.5°C — 16 September 2020.
The minimum daily temperature 11°C — 23 September 2018.
The minimum night temperature 8°C — 26 September 2015.
water temperature
2022 2021 2020 2019 2018 2017 2016 2015 2013 2012
The warmest water 20.9 °C — 14 September 2016. The coldest water 15.5 °C — 29 September 2012.
Sunny, cloudy and gloomy days
Precipitation, mm
Maximum precipitation 61.9 mm — August. Minimum precipitation 25.4 mm — April.
Wind speed, km / h
Maximum wind speed 21.1 km / h — December. Minimum wind speed 14.6 km / h — September.
Number of hours of sunshine
The maximum number of hours of sunshine per day 9.4 h. — June. The minimum number of hours of sunshine per day 2.7 h. — December.
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