Port Aransas, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 19.4 °C (low) to 25.1 °C (high). Annual precipitation averages 943.9 Millimeters. Port Aransas is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.3 °C | 17.2 °C | 59.44 mm |
| February | 12.2 °C | 18.6 °C | 49.02 mm |
| March | 15.3 °C | 21.3 °C | 67.06 mm |
| April | 19.3 °C | 24.6 °C | 48.51 mm |
| May | 22.9 °C | 27.5 °C | 97.28 mm |
| June | 25.8 °C | 30.4 °C | 88.65 mm |
| July | 26.4 °C | 31 °C | 73.66 mm |
| August | 26.6 °C | 31.4 °C | 59.69 mm |
| September | 24.8 °C | 30.5 °C | 167.89 mm |
| October | 21.6 °C | 27.4 °C | 109.98 mm |
| November | 16.1 °C | 22.8 °C | 77.47 mm |
| December | 11.6 °C | 18.7 °C | 45.21 mm |
| Annual | 19.4 °C | 25.1 °C | 943.86 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |