Mathis, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.3 °C (low) to 28 °C (high). Annual precipitation averages 722.4 Millimeters. Mathis is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.2 °C | 19.3 °C | 38.86 mm |
| February | 9.4 °C | 21.6 °C | 34.04 mm |
| March | 12.9 °C | 24.6 °C | 57.15 mm |
| April | 16.3 °C | 27.9 °C | 46.74 mm |
| May | 20.4 °C | 30.9 °C | 77.72 mm |
| June | 23.1 °C | 33.8 °C | 74.68 mm |
| July | 23.6 °C | 34.8 °C | 72.14 mm |
| August | 23.7 °C | 35.7 °C | 58.42 mm |
| September | 21.8 °C | 32.8 °C | 105.92 mm |
| October | 17.2 °C | 29.4 °C | 68.58 mm |
| November | 12 °C | 24.3 °C | 43.69 mm |
| December | 8.3 °C | 20.3 °C | 44.45 mm |
| Annual | 16.3 °C | 28 °C | 722.39 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 |