Triumph, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.7 °C (low) to 24.8 °C (high). Annual precipitation averages 1604 Millimeters. Triumph is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.4 °C | 16.3 °C | 128.78 mm |
| February | 10.1 °C | 18.2 °C | 107.7 mm |
| March | 12.9 °C | 21 °C | 120.65 mm |
| April | 16.9 °C | 24.3 °C | 109.47 mm |
| May | 21.1 °C | 27.8 °C | 91.44 mm |
| June | 24.3 °C | 30.7 °C | 160.02 mm |
| July | 25.2 °C | 31.6 °C | 204.47 mm |
| August | 25.2 °C | 31.7 °C | 190.25 mm |
| September | 24.2 °C | 30.2 °C | 163.32 mm |
| October | 19.8 °C | 26.1 °C | 103.63 mm |
| November | 14.2 °C | 21.3 °C | 103.38 mm |
| December | 10.2 °C | 17.8 °C | 120.9 mm |
| Annual | 17.7 °C | 24.8 °C | 1604.01 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 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |