Del Mar Heights, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 18.6 °C (low) to 28.6 °C (high). Annual precipitation averages 712.5 Millimeters. Del Mar Heights is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.6 °C | 21.1 °C | 35.56 mm |
| February | 12.7 °C | 23.3 °C | 36.07 mm |
| March | 15.6 °C | 26 °C | 35.31 mm |
| April | 19 °C | 28.8 °C | 38.35 mm |
| May | 22.3 °C | 31.4 °C | 54.1 mm |
| June | 24.4 °C | 33.7 °C | 64.26 mm |
| July | 24.8 °C | 34.2 °C | 63.5 mm |
| August | 24.8 °C | 34.9 °C | 43.94 mm |
| September | 23.2 °C | 32.7 °C | 146.56 mm |
| October | 19.4 °C | 30 °C | 100.08 mm |
| November | 14.9 °C | 25.6 °C | 51.05 mm |
| December | 11.3 °C | 21.9 °C | 43.69 mm |
| Annual | 18.6 °C | 28.6 °C | 712.47 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |