You should expect the average temperature in Volterra through September is 18. Through the month the highs are about 23 degrees celsius with a low of 17 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 18 |
| High Temperature | 23 |
| Low Temperature | 17 |
Useful Links: Volterra Weather: Average Weather & Yearly Climate