Port Orchard, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7 °C (low) to 15.9 °C (high). Annual precipitation averages 1219.7 Millimeters. Port Orchard is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °C | 8.5 °C | 190.25 mm |
| February | 2.4 °C | 9.9 °C | 112.52 mm |
| March | 3.7 °C | 12.2 °C | 131.06 mm |
| April | 5.4 °C | 15.1 °C | 84.33 mm |
| May | 8.4 °C | 18.6 °C | 52.58 mm |
| June | 10.8 °C | 20.8 °C | 39.37 mm |
| July | 12.8 °C | 24.3 °C | 20.83 mm |
| August | 12.9 °C | 24.7 °C | 25.91 mm |
| September | 10.8 °C | 21.7 °C | 46.74 mm |
| October | 7.5 °C | 15.7 °C | 115.57 mm |
| November | 4.3 °C | 10.9 °C | 194.06 mm |
| December | 2.4 °C | 8 °C | 206.5 mm |
| Annual | 7 °C | 15.9 °C | 1219.72 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |