Oceanside, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.5 °C (low) to 14.5 °C (high). Annual precipitation averages 2376.2 Millimeters. Oceanside 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.2 °C | 10.1 °C | 345.95 mm |
| February | 4.3 °C | 11 °C | 256.79 mm |
| March | 4.8 °C | 12.1 °C | 264.67 mm |
| April | 5.8 °C | 13.6 °C | 198.63 mm |
| May | 8.2 °C | 15.3 °C | 120.14 mm |
| June | 9.9 °C | 17 °C | 86.11 mm |
| July | 11.6 °C | 18.8 °C | 24.64 mm |
| August | 11.5 °C | 19.3 °C | 34.04 mm |
| September | 10.4 °C | 18.8 °C | 84.33 mm |
| October | 8.4 °C | 16.2 °C | 213.36 mm |
| November | 6.3 °C | 12.1 °C | 356.36 mm |
| December | 4.3 °C | 9.6 °C | 391.16 mm |
| Annual | 7.5 °C | 14.5 °C | 2376.18 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 20-30 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |