Rio, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 19.4 °C (low) to 28 °C (high). Annual precipitation averages 1478.5 Millimeters. Rio is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13 °C | 22.9 °C | 72.39 mm |
| February | 14.1 °C | 24.3 °C | 67.06 mm |
| March | 16 °C | 25.4 °C | 81.79 mm |
| April | 18.7 °C | 27.5 °C | 81.28 mm |
| May | 21.2 °C | 29.6 °C | 132.84 mm |
| June | 23.3 °C | 31.2 °C | 176.02 mm |
| July | 24.1 °C | 32.2 °C | 162.31 mm |
| August | 24.2 °C | 32.2 °C | 210.06 mm |
| September | 23.8 °C | 31.2 °C | 194.06 mm |
| October | 21.7 °C | 29.2 °C | 140.21 mm |
| November | 17.8 °C | 26.3 °C | 89.15 mm |
| December | 15.1 °C | 24.4 °C | 71.37 mm |
| Annual | 19.4 °C | 28 °C | 1478.54 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |