Oak Island, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.5 °C (low) to 24.6 °C (high). Annual precipitation averages 1504.9 Millimeters. Oak Island is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.1 °C | 15.8 °C | 122.68 mm |
| February | 9.9 °C | 17.4 °C | 83.57 mm |
| March | 13.4 °C | 20.5 °C | 91.44 mm |
| April | 17.1 °C | 24.1 °C | 104.9 mm |
| May | 21.4 °C | 27.6 °C | 137.67 mm |
| June | 24.5 °C | 30.7 °C | 143.76 mm |
| July | 25.7 °C | 31.8 °C | 137.41 mm |
| August | 25.2 °C | 32.2 °C | 171.2 mm |
| September | 23.4 °C | 30.2 °C | 163.32 mm |
| October | 19 °C | 26.3 °C | 129.03 mm |
| November | 13.4 °C | 21.1 °C | 107.95 mm |
| December | 9.2 °C | 17.1 °C | 112.01 mm |
| Annual | 17.5 °C | 24.6 °C | 1504.94 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |