Morro Bay, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 9.9 °C (low) to 18.3 °C (high). Annual precipitation averages 415.8 Millimeters. Morro Bay is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.9 °C | 17.2 °C | 77.72 mm |
| February | 7.9 °C | 17.2 °C | 93.22 mm |
| March | 8.1 °C | 17.6 °C | 85.6 mm |
| April | 8.5 °C | 17.5 °C | 26.42 mm |
| May | 9.6 °C | 17.2 °C | 11.43 mm |
| June | 10.8 °C | 17.9 °C | 1.78 mm |
| July | 12.2 °C | 18.8 °C | 1.78 mm |
| August | 12.6 °C | 19 °C | 0.76 mm |
| September | 12.3 °C | 19.8 °C | 2.29 mm |
| October | 11.3 °C | 20.4 °C | 13.46 mm |
| November | 9.6 °C | 19.3 °C | 28.96 mm |
| December | 7.8 °C | 17.1 °C | 72.39 mm |
| Annual | 9.9 °C | 18.3 °C | 415.81 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 | Csb - Warm-Summer Mediterranean Climate |