Seacliff, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 47.7 °F (low) to 62.9 °F (high). Annual precipitation averages 27.3 Inches. Seacliff is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.5 °F | 59.8 °F | 5.72 in. |
| February | 43.4 °F | 60.5 °F | 5.65 in. |
| March | 44.1 °F | 61.8 °F | 3.67 in. |
| April | 45.2 °F | 61.1 °F | 1.94 in. |
| May | 48.5 °F | 61.8 °F | 0.69 in. |
| June | 51.0 °F | 64.2 °F | 0.32 in. |
| July | 53.5 °F | 63.9 °F | 0.04 in. |
| August | 54.0 °F | 65.6 °F | 0.09 in. |
| September | 52.8 °F | 66.5 °F | 0.12 in. |
| October | 49.8 °F | 66.3 °F | 1.23 in. |
| November | 45.5 °F | 64.2 °F | 2.51 in. |
| December | 42.0 °F | 59.4 °F | 5.31 in. |
| Annual | 47.7 °F | 62.9 °F | 27.29 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |