San Antonio Heights, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 11 °C (low) to 23.9 °C (high). Annual precipitation averages 615.5 Millimeters. San Antonio Heights is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7 °C | 17.6 °C | 138.18 mm |
| February | 6.4 °C | 17.4 °C | 150.88 mm |
| March | 7.2 °C | 19.1 °C | 99.82 mm |
| April | 8.1 °C | 21.2 °C | 32 mm |
| May | 10.3 °C | 23.6 °C | 22.61 mm |
| June | 12.9 °C | 27.7 °C | 4.83 mm |
| July | 16.6 °C | 31.8 °C | 2.29 mm |
| August | 17.4 °C | 32.7 °C | 0.76 mm |
| September | 16.3 °C | 30.9 °C | 5.08 mm |
| October | 13.2 °C | 26.1 °C | 26.16 mm |
| November | 9.4 °C | 21.3 °C | 37.34 mm |
| December | 6.6 °C | 17.1 °C | 95.5 mm |
| Annual | 11 °C | 23.9 °C | 615.45 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |