San Antonio Heights, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 51.7 °F (low) to 75 °F (high). Annual precipitation averages 24.2 Inches. San Antonio Heights is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.6 °F | 63.6 °F | 5.44 in. |
| February | 43.5 °F | 63.3 °F | 5.94 in. |
| March | 45.0 °F | 66.4 °F | 3.93 in. |
| April | 46.5 °F | 70.1 °F | 1.26 in. |
| May | 50.5 °F | 74.4 °F | 0.89 in. |
| June | 55.3 °F | 81.9 °F | 0.19 in. |
| July | 61.9 °F | 89.3 °F | 0.09 in. |
| August | 63.3 °F | 90.9 °F | 0.03 in. |
| September | 61.3 °F | 87.6 °F | 0.2 in. |
| October | 55.7 °F | 78.9 °F | 1.03 in. |
| November | 48.9 °F | 70.4 °F | 1.47 in. |
| December | 43.8 °F | 62.7 °F | 3.76 in. |
| Annual | 51.7 °F | 75 °F | 24.23 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |