Frequent average weather in St-Nazaire right-through September is 14 with the high being 20 with lows about 11 degrees celsius. We have put some more info below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 14 |
| High Temperature | 20 |
| Low Temperature | 11 |
| Sunshine Per Day | 8 |
Useful Links: St-Nazaire Weather: Average Weather & Yearly Climate