Frequently the average temperatures in Haarlem during the duration of September is 12. Through the month the highs are about 19 and low around 9. We have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 12 |
| High Temperature | 19 |
| Low Temperature | 9 |
Useful Links: Haarlem Weather: Average Weather & Yearly Climate