South San Jose Hills, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 53.8 °F (low) to 79.2 °F (high). Annual precipitation averages 15.6 Inches. South San Jose Hills is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 45.7 °F | 68.9 °F | 3.73 in. |
| February | 46.6 °F | 69.1 °F | 4.06 in. |
| March | 48.7 °F | 71.5 °F | 2.3 in. |
| April | 50.9 °F | 75.8 °F | 0.76 in. |
| May | 55.4 °F | 78.9 °F | 0.37 in. |
| June | 59.0 °F | 84.5 °F | 0.11 in. |
| July | 62.7 °F | 91.0 °F | 0.05 in. |
| August | 63.3 °F | 93.0 °F | 0.01 in. |
| September | 61.5 °F | 90.4 °F | 0.13 in. |
| October | 56.7 °F | 83.6 °F | 0.62 in. |
| November | 50.0 °F | 74.9 °F | 0.89 in. |
| December | 45.0 °F | 68.3 °F | 2.6 in. |
| Annual | 53.8 °F | 79.2 °F | 15.63 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| 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 |