September · Netherlands
Best time to visit Rotterdam in September Weather, crowds & prices
Weather in Rotterdam in September
Average temperature 17°C, 101 mm of rain, about 25 days with 6+ hours of sunshine and 79% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.9/10
Ranked #5 of 12 months
- Avg temp
- 17°C
- Rainfall
- 101 mm
- Humidity
- 79%
- Days with 6h+ sun
- 25
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Rotterdam scores 7.9/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 17°C, 101 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
Rotterdam rebuilt itself in glass and steel, and its harbour, bridges, and museums reward a walking or cycling stay.
September in Rotterdam: strong conditions, 5th of 12
September averages 17°C (62°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Monthly rainfall reaches 101 mm — wet for this destination — but about 25 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 7.9/10 here, 5th of 12 months, against 9.1/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
Plan for mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Rotterdam in September?
- In September, Rotterdam averages 17°C, 101 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 7.9/10.
- Is September a good time to visit Rotterdam?
- September earns a 7.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Rotterdam in September?
- Expect about 101 mm of rain in September. Average humidity is 79% and there are about 25 days with 6+ hours of sunshine.
Curated in Rotterdam
Tickets & experiences
Things to do in Rotterdam
Rotterdam, Netherlands. Live activities and tours from GetYourGuide, matched to this destination.