Stuart, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 19.3 °C (low) to 28 °C (high). Annual precipitation averages 1484.9 Millimeters. Stuart is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.9 °C | 22.9 °C | 72.14 mm |
| February | 13.9 °C | 24.3 °C | 66.04 mm |
| March | 15.8 °C | 25.4 °C | 83.06 mm |
| April | 18.5 °C | 27.5 °C | 80.77 mm |
| May | 21 °C | 29.6 °C | 131.83 mm |
| June | 23.1 °C | 31.3 °C | 179.83 mm |
| July | 23.9 °C | 32.2 °C | 161.54 mm |
| August | 24.1 °C | 32.2 °C | 211.58 mm |
| September | 23.7 °C | 31.2 °C | 198.88 mm |
| October | 21.6 °C | 29.2 °C | 140.72 mm |
| November | 17.7 °C | 26.3 °C | 88.39 mm |
| December | 14.9 °C | 24.4 °C | 70.1 mm |
| Annual | 19.3 °C | 28 °C | 1484.88 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |