Rotterdam weather in September 2025

Expect 18°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Rotterdam in September. Check more long-term weather averages for Rotterdam in September before you book your next holiday to Netherlands in 2025/2026.

  • 18°C maximum daytime temperature in September in Rotterdam18
    18°C max day temperature
  • 4 hours of sunshine per day
  • 15 days with some rainfall in September in Rotterdam15
    15 days with some rainfall
  • 10°C minimum night-time temperature in September in Rotterdam10
    10°C min night temperature
  • 13 hours of daylight per day in September in Rotterdam13
    13 hours of daylight per day
  • No heat & humidity in September in Rotterdam0
    No heat & humidity
  • 75 mm monthly rainfall in September in Rotterdam75
    75 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Rotterdam4
    4 (Moderate) UV index

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The September weather guide for Netherlands (Rotterdam) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Rotterdam in September?

Daytime temperatures usually reach 18°C in Rotterdam in September, falling to 10°C at night.

How sunny is it in Rotterdam in September?

There are normally 4 hours of bright sunshine each day in Rotterdam in September - that's 35% of daylight hours.

Does it rain in Rotterdam in September?

There are usually 15 days with some rain in Rotterdam in September and the average monthly rainfall is 75mm.

Rotterdam September sunrise & sunset times

Browse the sunrise and sunset times for Rotterdam in September 2025. Select a month to view Rotterdam sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:54 19:29
Monday, 15th September 2025 06:17 18:56
Tuesday, 30th September 2025 06:42 18:21

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