San Gabriel, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 12.5 °C (low) to 25.6 °C (high). Annual precipitation averages 448.3 Millimeters. San Gabriel is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.9 °C | 20.6 °C | 104.39 mm |
| February | 8.4 °C | 20.6 °C | 117.09 mm |
| March | 9.7 °C | 21.8 °C | 76.96 mm |
| April | 11.1 °C | 24.4 °C | 22.86 mm |
| May | 13.4 °C | 25.3 °C | 10.16 mm |
| June | 15.4 °C | 27.9 °C | 3.05 mm |
| July | 17.4 °C | 30.8 °C | 0.76 mm |
| August | 17.8 °C | 32 °C | 0.51 mm |
| September | 16.9 °C | 31.4 °C | 4.06 mm |
| October | 14.1 °C | 28.1 °C | 18.03 mm |
| November | 10.2 °C | 23.8 °C | 21.34 mm |
| December | 7.4 °C | 20.2 °C | 69.09 mm |
| Annual | 12.5 °C | 25.6 °C | 448.3 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 |