Seal Beach, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 55.6 °F (low) to 72.3 °F (high). Annual precipitation averages 11.8 Inches. Seal Beach is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 47.4 °F | 66.5 °F | 2.89 in. |
| February | 48.5 °F | 66.1 °F | 3.13 in. |
| March | 51.1 °F | 67.2 °F | 1.63 in. |
| April | 53.0 °F | 69.9 °F | 0.54 in. |
| May | 57.2 °F | 71.8 °F | 0.24 in. |
| June | 60.5 °F | 74.4 °F | 0.09 in. |
| July | 63.8 °F | 78.4 °F | 0.03 in. |
| August | 64.5 °F | 80.1 °F | 0.01 in. |
| September | 63.0 °F | 79.4 °F | 0.09 in. |
| October | 58.5 °F | 76.0 °F | 0.42 in. |
| November | 52.7 °F | 71.3 °F | 0.7 in. |
| December | 47.2 °F | 66.3 °F | 1.99 in. |
| Annual | 55.6 °F | 72.3 °F | 11.76 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10b : 35°F to 30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |