Sewall's Point, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 20 °C (low) to 28.1 °C (high). Annual precipitation averages 1563.6 Millimeters. Sewall's Point is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.7 °C | 23.1 °C | 77.72 mm |
| February | 14.9 °C | 24.4 °C | 70.1 mm |
| March | 16.7 °C | 25.4 °C | 85.85 mm |
| April | 19.3 °C | 27.5 °C | 86.61 mm |
| May | 21.7 °C | 29.4 °C | 141.99 mm |
| June | 23.7 °C | 31.3 °C | 186.94 mm |
| July | 24.4 °C | 32.2 °C | 169.67 mm |
| August | 24.6 °C | 32.2 °C | 224.28 mm |
| September | 24.2 °C | 31.2 °C | 201.17 mm |
| October | 22.2 °C | 29.3 °C | 147.57 mm |
| November | 18.4 °C | 26.5 °C | 96.27 mm |
| December | 15.7 °C | 24.6 °C | 75.44 mm |
| Annual | 20 °C | 28.1 °C | 1563.61 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |