Riviera, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.6 °C (low) to 28.8 °C (high). Annual precipitation averages 700.3 Millimeters. Riviera is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.8 °C | 20.5 °C | 31.5 mm |
| February | 10 °C | 22.9 °C | 35.81 mm |
| March | 13.5 °C | 25.7 °C | 44.2 mm |
| April | 16.8 °C | 29.2 °C | 38.35 mm |
| May | 20.9 °C | 31.8 °C | 68.33 mm |
| June | 23.2 °C | 34.3 °C | 82.55 mm |
| July | 23.6 °C | 35.2 °C | 65.79 mm |
| August | 23.6 °C | 35.9 °C | 60.96 mm |
| September | 21.8 °C | 33.2 °C | 129.03 mm |
| October | 17.2 °C | 30.1 °C | 69.09 mm |
| November | 12.4 °C | 25.2 °C | 35.05 mm |
| December | 8.8 °C | 21.4 °C | 39.62 mm |
| Annual | 16.6 °C | 28.8 °C | 700.28 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 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |