Newport Beach, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 13.1 °C (low) to 21 °C (high). Annual precipitation averages 280.2 Millimeters. Newport Beach is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.7 °C | 19.3 °C | 64.77 mm |
| February | 9.1 °C | 19.2 °C | 72.39 mm |
| March | 10.6 °C | 19.6 °C | 39.37 mm |
| April | 11.6 °C | 19.4 °C | 16.26 mm |
| May | 14 °C | 20 °C | 5.84 mm |
| June | 15.9 °C | 21.2 °C | 2.54 mm |
| July | 17.7 °C | 22.7 °C | 1.52 mm |
| August | 18.1 °C | 23.6 °C | 0 mm |
| September | 17.3 °C | 23.6 °C | 2.54 mm |
| October | 14.7 °C | 22.8 °C | 10.41 mm |
| November | 11.2 °C | 21.9 °C | 18.54 mm |
| December | 8.6 °C | 19.2 °C | 45.97 mm |
| Annual | 13.1 °C | 21 °C | 280.15 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |