Seaside, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 48.5 °F (low) to 64.1 °F (high). Annual precipitation averages 16.9 Inches. Seaside is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.6 °F | 60.0 °F | 3.54 in. |
| February | 44.5 °F | 60.3 °F | 3.47 in. |
| March | 45.3 °F | 61.2 °F | 2.65 in. |
| April | 46.2 °F | 62.0 °F | 1.24 in. |
| May | 49.3 °F | 64.2 °F | 0.46 in. |
| June | 51.7 °F | 65.7 °F | 0.11 in. |
| July | 54.0 °F | 66.6 °F | 0.04 in. |
| August | 54.6 °F | 67.5 °F | 0.03 in. |
| September | 53.4 °F | 68.7 °F | 0.07 in. |
| October | 50.4 °F | 68.4 °F | 0.69 in. |
| November | 46.2 °F | 64.0 °F | 1.58 in. |
| December | 42.9 °F | 60.0 °F | 3.04 in. |
| Annual | 48.5 °F | 64.1 °F | 16.92 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 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |