Seal Beach, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 13.1 °C (low) to 22.4 °C (high). Annual precipitation averages 298.7 Millimeters. Seal Beach is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.6 °C | 19.2 °C | 73.41 mm |
| February | 9.2 °C | 18.9 °C | 79.5 mm |
| March | 10.6 °C | 19.6 °C | 41.4 mm |
| April | 11.7 °C | 21.1 °C | 13.72 mm |
| May | 14 °C | 22.1 °C | 6.1 mm |
| June | 15.8 °C | 23.6 °C | 2.29 mm |
| July | 17.7 °C | 25.8 °C | 0.76 mm |
| August | 18.1 °C | 26.7 °C | 0.25 mm |
| September | 17.2 °C | 26.3 °C | 2.29 mm |
| October | 14.7 °C | 24.4 °C | 10.67 mm |
| November | 11.5 °C | 21.8 °C | 17.78 mm |
| December | 8.4 °C | 19.1 °C | 50.55 mm |
| Annual | 13.1 °C | 22.4 °C | 298.72 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |