Palacios, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 62.7 °F (low) to 78.7 °F (high). Annual precipitation averages 44.2 Inches. Palacios is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 45.5 °F | 63.8 °F | 3.39 in. |
| February | 49.3 °F | 66.8 °F | 2.31 in. |
| March | 55.6 °F | 71.8 °F | 2.92 in. |
| April | 61.8 °F | 77.9 °F | 2.8 in. |
| May | 69.8 °F | 83.7 °F | 4.2 in. |
| June | 75.6 °F | 88.8 °F | 4.73 in. |
| July | 77.4 °F | 90.4 °F | 4.22 in. |
| August | 76.7 °F | 91.7 °F | 3.26 in. |
| September | 72.3 °F | 88.5 °F | 5.58 in. |
| October | 64.2 °F | 82.2 °F | 4.11 in. |
| November | 55.7 °F | 72.9 °F | 3.68 in. |
| December | 47.9 °F | 65.8 °F | 3.01 in. |
| Annual | 62.7 °F | 78.7 °F | 44.21 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 |