South El Monte, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 12.9 °C (low) to 25.6 °C (high). Annual precipitation averages 396.2 Millimeters. South El Monte is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.2 °C | 20.7 °C | 89.66 mm |
| February | 8.9 °C | 20.7 °C | 104.39 mm |
| March | 10.2 °C | 21.8 °C | 64.77 mm |
| April | 11.4 °C | 24.9 °C | 22.1 mm |
| May | 13.8 °C | 25.7 °C | 9.4 mm |
| June | 15.8 °C | 28.1 °C | 2.54 mm |
| July | 17.7 °C | 30.6 °C | 0.76 mm |
| August | 18.1 °C | 31.8 °C | 0.25 mm |
| September | 17.2 °C | 31.1 °C | 3.3 mm |
| October | 14.5 °C | 28 °C | 14.22 mm |
| November | 10.7 °C | 23.8 °C | 19.81 mm |
| December | 7.7 °C | 20.3 °C | 65.02 mm |
| Annual | 12.9 °C | 25.6 °C | 396.22 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°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 |