Palmetto Bay, Florida has a Tropical Monsoon climate (Köppen classification: Am). Average annual temperatures range from 21 °C (low) to 28.7 °C (high). Annual precipitation averages 1548.6 Millimeters. Palmetto Bay is located in USDA Plant Hardiness Zone 11a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.6 °C | 24.4 °C | 51.05 mm |
| February | 16.6 °C | 25.4 °C | 55.88 mm |
| March | 18.1 °C | 26.6 °C | 59.18 mm |
| April | 20.3 °C | 28.4 °C | 78.74 mm |
| May | 22.5 °C | 30.1 °C | 140.97 mm |
| June | 24.1 °C | 31.4 °C | 234.95 mm |
| July | 24.9 °C | 32.2 °C | 171.96 mm |
| August | 24.9 °C | 32.3 °C | 203.71 mm |
| September | 24.5 °C | 31.4 °C | 234.44 mm |
| October | 22.9 °C | 29.8 °C | 179.58 mm |
| November | 19.7 °C | 27.2 °C | 76.45 mm |
| December | 17.4 °C | 25.5 °C | 61.72 mm |
| Annual | 21 °C | 28.7 °C | 1548.63 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 11a : 4.4°C to 7.2°C |
| Plant Hardiness Zone - 2012 | Zone 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Am - Tropical Monsoon |