Cool
Average highs are around 18°C, so pack for cooler days.
September verdict
Rotterdam, Netherlands in September
Weather score38Poor
Poor for holiday weather
Average highs are around 18°C, so pack for cooler days. Sunshine averages 4.3h per day, so this is not one of the brighter months. Rainfall averages 75mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
18°C
Rain
75mm
Sun
4.3h
Weather score
38
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 75mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 4.3h per day, so this is not one of the brighter months.
Map
Weather map
Compare Rotterdam, Netherlands with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September18°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September75mm average rain
September is wetter than Rotterdam's yearly average, so flexible plans matter more.
Driest monthsJanuary to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.3 hours average sun
September sits close to Rotterdam's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
September38 weather score
September sits close to Rotterdam's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
