Normally average temperatures in Slough during September is 14. You can expect a high of 20 and lows around 11. We have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 14 |
| High Temperature | 20 |
| Low Temperature | 11 |
| Sunshine Per Day | 6 |
Useful Links: Slough Weather: Average Weather & Yearly Climate