Usually average temperatures are Bognor Regis right through September is 13. You can expect highs around 18 with low of 13 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 13 |
| High Temperature | 18 |
| Low Temperature | 13 |
| Sunshine Per Day | 7 |
Useful Links: Bognor Regis Weather: Average Weather & Yearly Climate