Olmito, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 65.2 °F (low) to 84.2 °F (high). Annual precipitation averages 28.6 Inches. Olmito is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 50.9 °F | 70.4 °F | 1.15 in. |
| February | 54.7 °F | 74.5 °F | 1.36 in. |
| March | 59.9 °F | 79.4 °F | 1.38 in. |
| April | 65.9 °F | 84.6 °F | 1.5 in. |
| May | 72.0 °F | 89.4 °F | 2.33 in. |
| June | 75.7 °F | 93.5 °F | 2.75 in. |
| July | 76.5 °F | 94.5 °F | 2.78 in. |
| August | 76.6 °F | 95.8 °F | 2.03 in. |
| September | 73.4 °F | 91.4 °F | 5.88 in. |
| October | 66.6 °F | 86.6 °F | 3.92 in. |
| November | 58.5 °F | 78.5 °F | 1.87 in. |
| December | 52.1 °F | 71.8 °F | 1.69 in. |
| Annual | 65.2 °F | 84.2 °F | 28.64 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |