Seabeck, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.6 °C (low) to 15.8 °C (high). Annual precipitation averages 1119.6 Millimeters. Seabeck is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 8.3 °C | 170.18 mm |
| February | 2 °C | 9.7 °C | 107.19 mm |
| March | 3.3 °C | 12.1 °C | 119.89 mm |
| April | 5 °C | 15.1 °C | 78.99 mm |
| May | 8 °C | 18.6 °C | 51.05 mm |
| June | 10.4 °C | 20.7 °C | 41.4 mm |
| July | 12.3 °C | 24.3 °C | 20.83 mm |
| August | 12.4 °C | 24.8 °C | 26.16 mm |
| September | 10.3 °C | 21.8 °C | 44.2 mm |
| October | 7.1 °C | 15.8 °C | 105.16 mm |
| November | 3.9 °C | 10.8 °C | 174.24 mm |
| December | 2 °C | 7.8 °C | 180.34 mm |
| Annual | 6.6 °C | 15.8 °C | 1119.63 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |