Mathews, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.7 °C (low) to 25.8 °C (high). Annual precipitation averages 1665 Millimeters. Mathews is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.7 °C | 17.3 °C | 137.41 mm |
| February | 8.7 °C | 19.3 °C | 111.76 mm |
| March | 11.9 °C | 22.4 °C | 111 mm |
| April | 15.4 °C | 25.4 °C | 126.49 mm |
| May | 19.6 °C | 29.1 °C | 143.26 mm |
| June | 22.7 °C | 31.6 °C | 187.45 mm |
| July | 23.6 °C | 32.6 °C | 195.07 mm |
| August | 23.4 °C | 32.7 °C | 181.61 mm |
| September | 21.6 °C | 30.9 °C | 146.3 mm |
| October | 16.2 °C | 27.1 °C | 103.38 mm |
| November | 10.6 °C | 22.1 °C | 100.84 mm |
| December | 7.8 °C | 18.6 °C | 120.4 mm |
| Annual | 15.7 °C | 25.8 °C | 1664.97 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 |