Morro Bay, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 49.8 °F (low) to 64.9 °F (high). Annual precipitation averages 16.4 Inches. Morro Bay is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.2 °F | 63.0 °F | 3.06 in. |
| February | 46.3 °F | 62.9 °F | 3.67 in. |
| March | 46.6 °F | 63.6 °F | 3.37 in. |
| April | 47.3 °F | 63.5 °F | 1.04 in. |
| May | 49.2 °F | 63.0 °F | 0.45 in. |
| June | 51.5 °F | 64.3 °F | 0.07 in. |
| July | 54.0 °F | 65.9 °F | 0.07 in. |
| August | 54.6 °F | 66.2 °F | 0.03 in. |
| September | 54.1 °F | 67.6 °F | 0.09 in. |
| October | 52.4 °F | 68.8 °F | 0.53 in. |
| November | 49.2 °F | 66.8 °F | 1.14 in. |
| December | 46.0 °F | 62.7 °F | 2.85 in. |
| Annual | 49.8 °F | 64.9 °F | 16.37 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 | Csb - Warm-Summer Mediterranean Climate |