Typically, you can expect that the weather in St Peter Port during September is 14. Average high degrees are usually 18 and low being 13. We have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 14 |
| High Temperature | 18 |
| Low Temperature | 13 |
| Sunshine Per Day | 7 |
Useful Links: St Peter Port Weather: Average Weather & Yearly Climate