Port Richey, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 18.2 °C (low) to 26.9 °C (high). Annual precipitation averages 1426.7 Millimeters. Port Richey is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.4 °C | 20.6 °C | 75.95 mm |
| February | 11.9 °C | 21.8 °C | 66.04 mm |
| March | 14.3 °C | 24 °C | 81.03 mm |
| April | 17.6 °C | 26.4 °C | 70.1 mm |
| May | 20.8 °C | 29 °C | 68.83 mm |
| June | 23.7 °C | 30.8 °C | 192.02 mm |
| July | 24.4 °C | 31.6 °C | 229.36 mm |
| August | 24.4 °C | 31.8 °C | 254.51 mm |
| September | 23.3 °C | 31.4 °C | 187.71 mm |
| October | 19.9 °C | 28.6 °C | 67.06 mm |
| November | 15.1 °C | 24.8 °C | 48.26 mm |
| December | 12.1 °C | 22 °C | 85.85 mm |
| Annual | 18.2 °C | 26.9 °C | 1426.72 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |