Gatwick boasts a year-around average temperature of 10.0°C, peaking at 16.6°C in July, August, its warmest month, and dipping to an average low of 4.0°C in January, the coolest. Rainfall averages at 61.3mm annually, with November seeing the heaviest showers and June being the driest month.
Month | Temperature (Celcius) | Rainfall (mm) |
| January | 4.0 | 68.3 |
| February | 4.3 | 52.6 |
| March | 6.0 | 45.2 |
| April | 9.1 | 58.2 |
| May | 11.6 | 51.1 |
| June | 15.2 | 43.9 |
| July | 16.6 | 67.3 |
| August | 16.6 | 64.3 |
| September | 14.0 | 56.9 |
| October | 10.6 | 73.9 |
| November | 7.3 | 80.3 |
| December | 4.9 | 73.2 |