Seffner, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 61.8 °F (low) to 83.4 °F (high). Annual precipitation averages 57.2 Inches. Seffner is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 48.0 °F | 71.8 °F | 3.07 in. |
| February | 50.6 °F | 74.4 °F | 2.53 in. |
| March | 54.1 °F | 78.5 °F | 2.81 in. |
| April | 60.0 °F | 83.8 °F | 2.8 in. |
| May | 66.0 °F | 88.8 °F | 3.57 in. |
| June | 71.8 °F | 91.0 °F | 9.28 in. |
| July | 73.4 °F | 91.6 °F | 8.74 in. |
| August | 73.8 °F | 91.7 °F | 9.35 in. |
| September | 72.1 °F | 90.3 °F | 7.64 in. |
| October | 65.0 °F | 85.4 °F | 2.95 in. |
| November | 56.2 °F | 78.9 °F | 1.86 in. |
| December | 51.0 °F | 74.0 °F | 2.62 in. |
| Annual | 61.8 °F | 83.4 °F | 57.22 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |