Southwest Ranches, Florida has a Tropical Monsoon climate (Köppen classification: Am). Average annual temperatures range from 68.8 °F (low) to 84.4 °F (high). Annual precipitation averages 60.8 Inches. Southwest Ranches is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 58.3 °F | 76.1 °F | 2.28 in. |
| February | 60.4 °F | 78.2 °F | 2.35 in. |
| March | 63.4 °F | 80.4 °F | 2.56 in. |
| April | 67.5 °F | 83.9 °F | 3.21 in. |
| May | 71.7 °F | 86.9 °F | 5.27 in. |
| June | 74.9 °F | 89.4 °F | 8.8 in. |
| July | 76.1 °F | 90.7 °F | 7.83 in. |
| August | 76.4 °F | 91.1 °F | 8.01 in. |
| September | 76.0 °F | 89.3 °F | 8.25 in. |
| October | 72.3 °F | 86.5 °F | 6.63 in. |
| November | 66.0 °F | 81.5 °F | 3.27 in. |
| December | 62.0 °F | 78.2 °F | 2.36 in. |
| Annual | 68.8 °F | 84.4 °F | 60.82 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10b : 35°F to 30°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Am - Tropical Monsoon |