Normally the weather in Rotterdam during September is 13. Average highs are typically 18 with low temperatures being around 11. See our table below for a full breakdown:
| Month | Degrees Celsius |
|---|---|
| Temperature | 13 |
| High Temperature | 18 |
| Low Temperature | 11 |
| Sunshine Per Day | 5 |
Useful Links: Rotterdam Weather: Average Weather & Yearly Climate