Sand City, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 9.3 °C (low) to 17.5 °C (high). Annual precipitation averages 426.7 Millimeters. Sand City is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.6 °C | 15.5 °C | 89.41 mm |
| February | 7.1 °C | 15.7 °C | 86.87 mm |
| March | 7.5 °C | 16.1 °C | 67.31 mm |
| April | 8 °C | 16.3 °C | 30.73 mm |
| May | 9.7 °C | 17.4 °C | 11.43 mm |
| June | 11.1 °C | 18.3 °C | 2.79 mm |
| July | 12.2 °C | 18.7 °C | 1.02 mm |
| August | 12.6 °C | 19.3 °C | 0.76 mm |
| September | 11.9 °C | 19.8 °C | 1.78 mm |
| October | 10.4 °C | 19.8 °C | 17.53 mm |
| November | 8.1 °C | 17.7 °C | 40.39 mm |
| December | 6.3 °C | 15.5 °C | 76.71 mm |
| Annual | 9.3 °C | 17.5 °C | 426.73 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 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |