Seguin, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.8 °F (low) to 80.7 °F (high). Annual precipitation averages 33.6 Inches. Seguin is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.2 °F | 63.2 °F | 2.05 in. |
| February | 43.6 °F | 67.4 °F | 1.91 in. |
| March | 50.8 °F | 73.7 °F | 2.6 in. |
| April | 57.1 °F | 80.7 °F | 2.65 in. |
| May | 65.5 °F | 87.3 °F | 3.99 in. |
| June | 71.5 °F | 92.8 °F | 3.32 in. |
| July | 73.4 °F | 95.7 °F | 2.17 in. |
| August | 73.3 °F | 96.8 °F | 2.53 in. |
| September | 68.2 °F | 90.7 °F | 3.39 in. |
| October | 59.0 °F | 83.2 °F | 4.07 in. |
| November | 48.9 °F | 72.3 °F | 2.65 in. |
| December | 41.7 °F | 64.6 °F | 2.3 in. |
| Annual | 57.8 °F | 80.7 °F | 33.63 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |