Coronado, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 13.7 °C (low) to 20.8 °C (high). Annual precipitation averages 237.5 Millimeters. Coronado is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.4 °C | 18.8 °C | 48.26 mm |
| February | 9.9 °C | 18.4 °C | 58.67 mm |
| March | 11.2 °C | 18.7 °C | 36.07 mm |
| April | 12.6 °C | 19.3 °C | 16 mm |
| May | 14.6 °C | 20.3 °C | 4.57 mm |
| June | 16.2 °C | 21 °C | 1.27 mm |
| July | 18 °C | 22.8 °C | 1.27 mm |
| August | 18.7 °C | 24 °C | 0.51 mm |
| September | 17.9 °C | 24 °C | 2.29 mm |
| October | 15.2 °C | 22.8 °C | 8.89 mm |
| November | 11.9 °C | 21.3 °C | 18.54 mm |
| December | 8.9 °C | 18.6 °C | 41.15 mm |
| Annual | 13.7 °C | 20.8 °C | 237.49 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 |