South San Jose Hills, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 12.1 °C (low) to 26.2 °C (high). Annual precipitation averages 397 Millimeters. South San Jose Hills is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.6 °C | 20.5 °C | 94.74 mm |
| February | 8.1 °C | 20.6 °C | 103.12 mm |
| March | 9.3 °C | 21.9 °C | 58.42 mm |
| April | 10.5 °C | 24.3 °C | 19.3 mm |
| May | 13 °C | 26.1 °C | 9.4 mm |
| June | 15 °C | 29.2 °C | 2.79 mm |
| July | 17.1 °C | 32.8 °C | 1.27 mm |
| August | 17.4 °C | 33.9 °C | 0.25 mm |
| September | 16.4 °C | 32.4 °C | 3.3 mm |
| October | 13.7 °C | 28.7 °C | 15.75 mm |
| November | 10 °C | 23.8 °C | 22.61 mm |
| December | 7.2 °C | 20.2 °C | 66.04 mm |
| Annual | 12.1 °C | 26.2 °C | 396.99 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| 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 |