Click on a day for an hourly weather forecast
The temperatures in Rotterdam in September are usually low and can range between 14°C and 19°C.
You can expect about 3 to 8 days of rain in Rotterdam during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Rotterdam in September 2025.
If you’re planning to visit Rotterdam in the near future, we highly recommend that you review the 14 day weather forecast for Rotterdam before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 4° | 8 | 19 | 4 | 67 mm | Awful | Rotterdam in January |
| February | 7° / 3° | 7 | 17 | 4 | 49 mm | Bad | Rotterdam in February |
| March | 9° / 5° | 5 | 25 | 1 | 43 mm | Ok | Rotterdam in March |
| April | 13° / 8° | 3 | 27 | 1 | 32 mm | Ok | Rotterdam in April |
| May | 15° / 10° | 5 | 26 | 0 | 62 mm | Good | Rotterdam in May |
| June | 18° / 13° | 4 | 26 | 0 | 67 mm | Good | Rotterdam in June |
| July | 20° / 16° | 5 | 26 | 0 | 87 mm | Good | Rotterdam in July |
| August | 21° / 16° | 6 | 25 | 0 | 106 mm | Good | Rotterdam in August |
| September | 19° / 14° | 4 | 26 | 0 | 77 mm | Good | Rotterdam in September |
| October | 15° / 11° | 6 | 25 | 0 | 89 mm | Good | Rotterdam in October |
| November | 11° / 8° | 6 | 23 | 0 | 81 mm | Ok | Rotterdam in November |
| December | 8° / 5° | 8 | 20 | 2 | 79 mm | Awful | Rotterdam in December |