Kiawah Island, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 59.2 °F (low) to 74.5 °F (high). Annual precipitation averages 51.8 Inches. Kiawah Island 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 Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.7 °F | 58.6 °F | 3.42 in. |
| February | 43.4 °F | 61.1 °F | 3.33 in. |
| March | 49.8 °F | 67.0 °F | 3.45 in. |
| April | 57.6 °F | 73.8 °F | 3.13 in. |
| May | 66.5 °F | 80.7 °F | 3.09 in. |
| June | 73.1 °F | 85.9 °F | 5.44 in. |
| July | 76.0 °F | 89.1 °F | 6.15 in. |
| August | 75.1 °F | 87.8 °F | 6.97 in. |
| September | 71.3 °F | 84.0 °F | 5.63 in. |
| October | 61.1 °F | 76.7 °F | 4.58 in. |
| November | 50.7 °F | 68.1 °F | 2.88 in. |
| December | 44.5 °F | 61.4 °F | 3.69 in. |
| Annual | 59.2 °F | 74.5 °F | 51.76 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |