San Gabriel, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 54.5 °F (low) to 78 °F (high). Annual precipitation averages 17.7 Inches. San Gabriel is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.2 °F | 69.0 °F | 4.11 in. |
| February | 47.2 °F | 69.1 °F | 4.61 in. |
| March | 49.4 °F | 71.2 °F | 3.03 in. |
| April | 52.0 °F | 75.9 °F | 0.9 in. |
| May | 56.2 °F | 77.6 °F | 0.4 in. |
| June | 59.8 °F | 82.3 °F | 0.12 in. |
| July | 63.4 °F | 87.4 °F | 0.03 in. |
| August | 64.1 °F | 89.6 °F | 0.02 in. |
| September | 62.5 °F | 88.5 °F | 0.16 in. |
| October | 57.3 °F | 82.6 °F | 0.71 in. |
| November | 50.3 °F | 74.9 °F | 0.84 in. |
| December | 45.3 °F | 68.3 °F | 2.72 in. |
| Annual | 54.5 °F | 78 °F | 17.65 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 |