Port Aransas, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 66.9 °F (low) to 77.2 °F (high). Annual precipitation averages 37.2 Inches. Port Aransas is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 50.5 °F | 63.0 °F | 2.34 in. |
| February | 53.9 °F | 65.5 °F | 1.93 in. |
| March | 59.6 °F | 70.3 °F | 2.64 in. |
| April | 66.8 °F | 76.3 °F | 1.91 in. |
| May | 73.2 °F | 81.5 °F | 3.83 in. |
| June | 78.4 °F | 86.7 °F | 3.49 in. |
| July | 79.6 °F | 87.8 °F | 2.9 in. |
| August | 79.8 °F | 88.6 °F | 2.35 in. |
| September | 76.6 °F | 86.9 °F | 6.61 in. |
| October | 70.8 °F | 81.3 °F | 4.33 in. |
| November | 60.9 °F | 73.0 °F | 3.05 in. |
| December | 52.8 °F | 65.7 °F | 1.78 in. |
| Annual | 66.9 °F | 77.2 °F | 37.16 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |