Rotterdam in September usually sees fair weather conditions, with an average daily high temperature of +18°C and roughly 4 sunny days. However, you should prepare for about 8 rainy days with an average precipitation of 65 mm. The weather is changeable so pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+18°C
Avg. max. temperature
+3°C
Min.
+32°C
Max.
65 mm
Total precipitation
81%
Avg. humidity
3 m/s
Avg. wind
4 ☀️
Sunny Days
18 ⛅️
Cloudy
8 🌦
Rainy
Our opinion: Rotterdam has OK weather in September.
Average temperature in Rotterdam in September
Here are the expected maximum, average and minimum temperatures in Rotterdam for September based on the historical data.
Last Year
Historical Data
The temperature in September is +20°C on average, with a range between a maximum of +30°C during the day and a minimum of +6°C at night.
The average maximum temperature goes down 33% by the end of the month, compared with the beginning of the month, from +25°C to +17°C.
Is Rotterdam warm or cold in September?
Rotterdam is typically mild in September.
Maximum temperatures go down compared to the previous month from +21°C to +18°C. The minimum temperature also goes down from +14°C to +12°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Rotterdam:
Climate in Rotterdam in September
Rotterdam weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+21°C
+18°C
+14°C
Min. temperature
+6°C
+3°C
-3°C
Max. temperature
+34°C
+32°C
+25°C
Rainfall
70 mm
65 mm
72 mm
Wind
2 m/s
3 m/s
3 m/s
Humidity
77%
81%
84%
Air pressure
1014 HPa
1014 HPa
1013 HPa
Sunny days
4
4
3
Cloudy days
19
18
19
Rainy days
8
8
9
Snowy days
0
0
0
September weather is still as ok as in August.It’s getting colder in September. From +21°C in the day, the average maximum temperature lowers to +18°C.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 70 mm to 65 mm.Humidity rises from 77% to 81%.Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average.The amount of sunny days stay about the same, averaging 4 sunny days during the month.
October brings much the same weather, it remains ok.
Wind speed in Rotterdam in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Rotterdam is gradually increasing during September, going from 3 m/s to 4 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Rotterdam based on historical data.
Last Year
Historical Data
Typically, there is a 67% chance of rain on an average day in September, with total rainfall of approximately 110 mm. The maximum amount of rainfall per day is around 13 mm, which is considered light rain.September is a pretty wet month with over 20 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Rotterdam wettest month is October, where a typical day has a 29% chance of precipitation and 72 mm of rainfall per day. April, on the other hand, is the driest month with a mere 23% chance of precipitation and 48 mm of rainfall per day.
How was the weather last September in Rotterdam?
This is the weather in Rotterdam in September 2023:
1 September
☁️
+25°C
2 September
☁️
+27°C
3 September
☁️
+28°C
4 September
☁️
+27°C
5 September
☁️
+30°C
6 September
🌧️
+25°C
7 September
🌧️
+24°C
8 September
🌧️
+22°C
9 September
☁️
+18°C
10 September
☁️
+21°C
11 September
☁️
+22°C
12 September
☁️
+24°C
13 September
☁️
+22°C
14 September
🌧️
+19°C
15 September
☀️
+19°C
16 September
🌧️
+15°C
17 September
🌧️
+16°C
18 September
🌧️
+14°C
19 September
☁️
+17°C
20 September
☁️
+17°C
21 September
☁️
+18°C
22 September
☁️
+19°C
23 September
☁️
+18°C
24 September
☁️
+16°C
25 September
☀️
+17°C
26 September
🌧️
+13°C
27 September
🌧️
+12°C
28 September
🌧️
+14°C
29 September
☀️
+16°C
30 September
☁️
+17°C
In September 2023 Rotterdam had 3 sunny days, 17 cloudy days, and 10 rainy days. The average maximum temperature was +20°C, with an absolute maximum of +30°C and a minimum of +12°C. The average humidity was 78%, with a maximum of 96% and a minimum of 36%. The average wind speed was 3 m/s, with a maximum of 8 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change over Years
This is how Rotterdam climate have been changing during last 43 years period.
The climate in Rotterdam in September has not changed much over the last 43 years.
The average temperature was the lowest in 1986 (+16°C) and the highest in 2016 (+23°C). The driest year was 1997 with only 20 mm of rainfall, and the wettest year was 2017 with 233 mm.
FAQ
Frequently asked questions about the weather in Rotterdam in September:
Is September a good time to visit Rotterdam?
It’s always a good time to visit Rotterdam, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Rotterdam in September?
September has mild temperatures in Rotterdam. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is Rotterdam rainy in September?
Rotterdam is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Rotterdam in September?
Usually, it’s not very sunny in Rotterdam in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
Other cities in Netherlands
Check out the weather for other cities in Netherlands.
For this page, we’ve looked at the typical weather in Rotterdam, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.