Watsonville, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 47.6 °F (low) to 66.1 °F (high). Annual precipitation averages 22 Inches. Watsonville is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.8 °F | 60.3 °F | 4.09 in. |
| February | 43.1 °F | 60.8 °F | 4.64 in. |
| March | 44.1 °F | 62.2 °F | 2.98 in. |
| April | 45.3 °F | 65.0 °F | 1.63 in. |
| May | 48.8 °F | 67.2 °F | 0.55 in. |
| June | 51.2 °F | 69.0 °F | 0.12 in. |
| July | 54.2 °F | 69.4 °F | 0.03 in. |
| August | 54.5 °F | 70.5 °F | 0.05 in. |
| September | 53.1 °F | 71.9 °F | 0.06 in. |
| October | 49.3 °F | 71.4 °F | 0.9 in. |
| November | 44.8 °F | 64.8 °F | 2.16 in. |
| December | 41.5 °F | 60.1 °F | 4.77 in. |
| Annual | 47.6 °F | 66.1 °F | 21.98 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |