Rio Bravo, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 17.4 °C (low) to 30.2 °C (high). Annual precipitation averages 514.6 Millimeters. Rio Bravo is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.1 °C | 20.7 °C | 22.1 mm |
| February | 10.4 °C | 23.3 °C | 19.3 mm |
| March | 14.2 °C | 27.2 °C | 39.12 mm |
| April | 17.6 °C | 31.3 °C | 36.32 mm |
| May | 21.6 °C | 34.4 °C | 69.6 mm |
| June | 24.3 °C | 37.3 °C | 49.02 mm |
| July | 24.8 °C | 37.9 °C | 45.21 mm |
| August | 25 °C | 38.3 °C | 37.08 mm |
| September | 22.7 °C | 34.6 °C | 97.54 mm |
| October | 18.4 °C | 30.7 °C | 45.21 mm |
| November | 12.8 °C | 25.2 °C | 29.97 mm |
| December | 8.9 °C | 21.1 °C | 24.13 mm |
| Annual | 17.4 °C | 30.2 °C | 514.6 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 | BSh - Hot Semi-Arid Climate |