San Antonio, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.4 °C (low) to 28.2 °C (high). Annual precipitation averages 1448.6 Millimeters. San Antonio is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.8 °C | 21.8 °C | 81.28 mm |
| February | 10.3 °C | 23.5 °C | 61.47 mm |
| March | 12.2 °C | 25.8 °C | 78.99 mm |
| April | 15.4 °C | 28.4 °C | 79.76 mm |
| May | 18.7 °C | 31.2 °C | 87.38 mm |
| June | 21.8 °C | 32.4 °C | 223.52 mm |
| July | 22.7 °C | 32.8 °C | 214.38 mm |
| August | 22.8 °C | 32.8 °C | 228.09 mm |
| September | 21.9 °C | 31.9 °C | 196.09 mm |
| October | 18.4 °C | 29.2 °C | 79.25 mm |
| November | 13.3 °C | 25.6 °C | 48.51 mm |
| December | 10.5 °C | 23.1 °C | 69.85 mm |
| Annual | 16.4 °C | 28.2 °C | 1448.57 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |