Seffner, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.6 °C (low) to 28.5 °C (high). Annual precipitation averages 1453.4 Millimeters. Seffner is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.9 °C | 22.1 °C | 77.98 mm |
| February | 10.3 °C | 23.6 °C | 64.26 mm |
| March | 12.3 °C | 25.8 °C | 71.37 mm |
| April | 15.6 °C | 28.8 °C | 71.12 mm |
| May | 18.9 °C | 31.6 °C | 90.68 mm |
| June | 22.1 °C | 32.8 °C | 235.71 mm |
| July | 23 °C | 33.1 °C | 222 mm |
| August | 23.2 °C | 33.2 °C | 237.49 mm |
| September | 22.3 °C | 32.4 °C | 194.06 mm |
| October | 18.3 °C | 29.7 °C | 74.93 mm |
| November | 13.4 °C | 26.1 °C | 47.24 mm |
| December | 10.6 °C | 23.3 °C | 66.55 mm |
| Annual | 16.6 °C | 28.5 °C | 1453.39 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |