Downtown Long Beach boasts a year-around average temperature of 18.6°C, peaking at 23.5°C in August, its warmest month, and dipping to an average low of 14.2°C in December, the coolest. Rainfall averages at 30.2mm annually, with February seeing the heaviest showers and May, June, July, August, September being the driest month.
Month | Temperature (Celcius) | Rainfall (mm) |
| January | 14.4 | 79.2 |
| February | 15.0 | 96.5 |
| March | 15.9 | 61.7 |
| April | 17.3 | 23.1 |
| May | 18.8 | 0.0 |
| June | 20.7 | 0.0 |
| July | 23.0 | 0.0 |
| August | 23.5 | 0.0 |
| September | 22.8 | 0.0 |
| October | 20.3 | 16.8 |
| November | 16.9 | 26.4 |
| December | 14.2 | 59.2 |