Loyola, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 9 °C (low) to 21.9 °C (high). Annual precipitation averages 485.9 Millimeters. Loyola is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.1 °C | 15.3 °C | 100.58 mm |
| February | 5.8 °C | 16.7 °C | 106.93 mm |
| March | 6.9 °C | 18.7 °C | 69.34 mm |
| April | 7.9 °C | 20.4 °C | 33.78 mm |
| May | 9.9 °C | 23.4 °C | 11.43 mm |
| June | 11.6 °C | 26.6 °C | 3.3 mm |
| July | 13 °C | 28.1 °C | 0 mm |
| August | 13.1 °C | 27.8 °C | 1.27 mm |
| September | 12.4 °C | 27.4 °C | 1.78 mm |
| October | 10.2 °C | 24.4 °C | 19.05 mm |
| November | 6.9 °C | 18.9 °C | 44.2 mm |
| December | 4.8 °C | 15 °C | 94.23 mm |
| Annual | 9 °C | 21.9 °C | 485.89 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°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 |