Southwest Ranches, Florida has a Tropical Monsoon climate (Köppen classification: Am). Average annual temperatures range from 20.4 °C (low) to 29.1 °C (high). Annual precipitation averages 1544.8 Millimeters. Southwest Ranches is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.6 °C | 24.5 °C | 57.91 mm |
| February | 15.8 °C | 25.7 °C | 59.69 mm |
| March | 17.4 °C | 26.9 °C | 65.02 mm |
| April | 19.7 °C | 28.8 °C | 81.53 mm |
| May | 22.1 °C | 30.5 °C | 133.86 mm |
| June | 23.8 °C | 31.9 °C | 223.52 mm |
| July | 24.5 °C | 32.6 °C | 198.88 mm |
| August | 24.7 °C | 32.8 °C | 203.45 mm |
| September | 24.4 °C | 31.8 °C | 209.55 mm |
| October | 22.4 °C | 30.3 °C | 168.4 mm |
| November | 18.9 °C | 27.5 °C | 83.06 mm |
| December | 16.7 °C | 25.7 °C | 59.94 mm |
| Annual | 20.4 °C | 29.1 °C | 1544.81 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 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Am - Tropical Monsoon |