Belleair, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 66.1 °F (low) to 80.6 °F (high). Annual precipitation averages 56.2 Inches. Belleair is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 52.4 °F | 69.3 °F | 2.97 in. |
| February | 55.2 °F | 71.6 °F | 2.67 in. |
| March | 59.5 °F | 75.3 °F | 3.2 in. |
| April | 65.2 °F | 80.0 °F | 2.86 in. |
| May | 71.0 °F | 84.9 °F | 2.91 in. |
| June | 75.5 °F | 88.1 °F | 7.69 in. |
| July | 76.6 °F | 88.8 °F | 9.52 in. |
| August | 76.7 °F | 89.2 °F | 9.49 in. |
| September | 75.0 °F | 87.9 °F | 7.22 in. |
| October | 69.6 °F | 83.3 °F | 2.7 in. |
| November | 61.2 °F | 76.8 °F | 2.11 in. |
| December | 55.6 °F | 71.9 °F | 2.87 in. |
| Annual | 66.1 °F | 80.6 °F | 56.21 in. |
| Average First Frost Date | Frost Rare |
| 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 10a : 30°F to 25°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |