Port Orchard, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.6 °F (low) to 60.6 °F (high). Annual precipitation averages 48 Inches. 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 | 36.6 °F | 47.3 °F | 7.49 in. |
| February | 36.3 °F | 49.9 °F | 4.43 in. |
| March | 38.7 °F | 54.0 °F | 5.16 in. |
| April | 41.8 °F | 59.1 °F | 3.32 in. |
| May | 47.1 °F | 65.5 °F | 2.07 in. |
| June | 51.5 °F | 69.4 °F | 1.55 in. |
| July | 55.0 °F | 75.7 °F | 0.82 in. |
| August | 55.2 °F | 76.4 °F | 1.02 in. |
| September | 51.5 °F | 71.0 °F | 1.84 in. |
| October | 45.5 °F | 60.3 °F | 4.55 in. |
| November | 39.7 °F | 51.7 °F | 7.64 in. |
| December | 36.3 °F | 46.4 °F | 8.13 in. |
| Annual | 44.6 °F | 60.6 °F | 48.02 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |