San Pedro, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 18.4 °C (low) to 29.1 °C (high). Annual precipitation averages 715.5 Millimeters. San Pedro is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.3 °C | 21.4 °C | 27.94 mm |
| February | 12.4 °C | 23.8 °C | 33.02 mm |
| March | 15.3 °C | 26.4 °C | 34.54 mm |
| April | 18.7 °C | 29.3 °C | 37.08 mm |
| May | 22.1 °C | 31.9 °C | 59.44 mm |
| June | 24.2 °C | 34.3 °C | 71.12 mm |
| July | 24.6 °C | 34.9 °C | 70.61 mm |
| August | 24.7 °C | 35.6 °C | 51.82 mm |
| September | 22.9 °C | 33.1 °C | 145.29 mm |
| October | 19.2 °C | 30.4 °C | 97.03 mm |
| November | 14.7 °C | 25.9 °C | 45.97 mm |
| December | 11.1 °C | 22.2 °C | 41.66 mm |
| Annual | 18.4 °C | 29.1 °C | 715.52 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 |