Topsail Beach, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.6 °F (low) to 71.9 °F (high). Annual precipitation averages 59.8 Inches. Topsail Beach is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.4 °F | 55.0 °F | 3.89 in. |
| February | 38.9 °F | 57.5 °F | 3.62 in. |
| March | 44.4 °F | 63.3 °F | 3.98 in. |
| April | 53.4 °F | 71.1 °F | 3.51 in. |
| May | 62.3 °F | 77.8 °F | 4.14 in. |
| June | 70.5 °F | 83.9 °F | 5.28 in. |
| July | 73.9 °F | 87.2 °F | 6.25 in. |
| August | 72.6 °F | 86.1 °F | 8.0 in. |
| September | 68.1 °F | 82.2 °F | 8.49 in. |
| October | 57.6 °F | 74.7 °F | 4.86 in. |
| November | 47.4 °F | 65.7 °F | 4.06 in. |
| December | 40.9 °F | 58.6 °F | 3.7 in. |
| Annual | 55.6 °F | 71.9 °F | 59.78 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |