Westport, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.6 °F (low) to 60.3 °F (high). Annual precipitation averages 62.6 Inches. Westport is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.0 °F | 46.7 °F | 8.37 in. |
| February | 34.6 °F | 50.0 °F | 6.56 in. |
| March | 36.6 °F | 53.7 °F | 7.45 in. |
| April | 39.8 °F | 58.8 °F | 6.6 in. |
| May | 44.8 °F | 64.7 °F | 2.94 in. |
| June | 49.2 °F | 68.4 °F | 1.76 in. |
| July | 52.8 °F | 74.3 °F | 0.73 in. |
| August | 53.1 °F | 75.4 °F | 1.12 in. |
| September | 49.2 °F | 72.1 °F | 2.57 in. |
| October | 43.1 °F | 62.0 °F | 5.84 in. |
| November | 37.9 °F | 51.8 °F | 9.07 in. |
| December | 34.7 °F | 46.1 °F | 9.6 in. |
| Annual | 42.6 °F | 60.3 °F | 62.61 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |