South Pasadena, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 12 °C (low) to 25.5 °C (high). Annual precipitation averages 469.2 Millimeters. South Pasadena is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.7 °C | 20.3 °C | 105.92 mm |
| February | 8.1 °C | 20.4 °C | 120.65 mm |
| March | 9.2 °C | 21.7 °C | 81.28 mm |
| April | 10.6 °C | 24 °C | 25.65 mm |
| May | 12.8 °C | 25.1 °C | 11.94 mm |
| June | 14.7 °C | 27.8 °C | 3.3 mm |
| July | 16.8 °C | 30.8 °C | 1.02 mm |
| August | 17.2 °C | 32.1 °C | 0.51 mm |
| September | 16.4 °C | 31.6 °C | 4.32 mm |
| October | 13.7 °C | 28.1 °C | 17.02 mm |
| November | 9.8 °C | 23.7 °C | 22.61 mm |
| December | 7.2 °C | 19.9 °C | 74.93 mm |
| Annual | 12 °C | 25.5 °C | 469.15 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 |