Oak Island, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 63.6 °F (low) to 76.2 °F (high). Annual precipitation averages 59.3 Inches. Oak Island is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.5 °F | 60.4 °F | 4.83 in. |
| February | 49.8 °F | 63.4 °F | 3.29 in. |
| March | 56.1 °F | 68.9 °F | 3.6 in. |
| April | 62.8 °F | 75.3 °F | 4.13 in. |
| May | 70.5 °F | 81.6 °F | 5.42 in. |
| June | 76.1 °F | 87.2 °F | 5.66 in. |
| July | 78.3 °F | 89.3 °F | 5.41 in. |
| August | 77.3 °F | 90.0 °F | 6.74 in. |
| September | 74.2 °F | 86.4 °F | 6.43 in. |
| October | 66.2 °F | 79.4 °F | 5.08 in. |
| November | 56.2 °F | 69.9 °F | 4.25 in. |
| December | 48.6 °F | 62.7 °F | 4.41 in. |
| Annual | 63.6 °F | 76.2 °F | 59.25 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |