Newlands boasts a year-around average temperature of 16.7°C, peaking at 21.0°C in February, its warmest month, and dipping to an average low of 12.6°C in July, the coolest. Rainfall averages at 31.9mm annually, with July seeing the heaviest showers and January, February being the driest month.
Month | Temperature (Celcius) | Rainfall (mm) |
| January | 20.8 | 15.0 |
| February | 21.0 | 15.0 |
| March | 19.8 | 17.8 |
| April | 17.3 | 34.3 |
| May | 15.0 | 45.7 |
| June | 13.2 | 53.3 |
| July | 12.6 | 61.0 |
| August | 12.9 | 45.7 |
| September | 14.2 | 34.3 |
| October | 15.9 | 20.3 |
| November | 18.3 | 20.3 |
| December | 19.9 | 20.3 |
