Treasure Island, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 19.4 °C (low) to 26.2 °C (high). Annual precipitation averages 1404.4 Millimeters. Treasure Island is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.8 °C | 19.8 °C | 86.36 mm |
| February | 13.4 °C | 20.8 °C | 66.29 mm |
| March | 15.8 °C | 22.8 °C | 88.14 mm |
| April | 18.9 °C | 25.6 °C | 67.56 mm |
| May | 22.1 °C | 28.6 °C | 73.15 mm |
| June | 24.5 °C | 30.4 °C | 200.66 mm |
| July | 25.1 °C | 31.1 °C | 205.99 mm |
| August | 25.3 °C | 31.4 °C | 228.85 mm |
| September | 24.3 °C | 30.7 °C | 192.53 mm |
| October | 21.4 °C | 28 °C | 74.68 mm |
| November | 16.9 °C | 23.9 °C | 50.04 mm |
| December | 13.7 °C | 21.3 °C | 70.1 mm |
| Annual | 19.4 °C | 26.2 °C | 1404.35 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |