Palacios, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17 °C (low) to 25.9 °C (high). Annual precipitation averages 1122.9 Millimeters. Palacios is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.5 °C | 17.7 °C | 86.11 mm |
| February | 9.6 °C | 19.3 °C | 58.67 mm |
| March | 13.1 °C | 22.1 °C | 74.17 mm |
| April | 16.6 °C | 25.5 °C | 71.12 mm |
| May | 21 °C | 28.7 °C | 106.68 mm |
| June | 24.2 °C | 31.6 °C | 120.14 mm |
| July | 25.2 °C | 32.4 °C | 107.19 mm |
| August | 24.8 °C | 33.2 °C | 82.8 mm |
| September | 22.4 °C | 31.4 °C | 141.73 mm |
| October | 17.9 °C | 27.9 °C | 104.39 mm |
| November | 13.2 °C | 22.7 °C | 93.47 mm |
| December | 8.8 °C | 18.8 °C | 76.45 mm |
| Annual | 17 °C | 25.9 °C | 1122.92 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 |