Dauphin Island, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 63.4 °F (low) to 73.9 °F (high). Annual precipitation averages 61.7 Inches. Dauphin Island is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 45.9 °F | 58.4 °F | 5.33 in. |
| February | 48.6 °F | 61.1 °F | 4.6 in. |
| March | 55.1 °F | 66.4 °F | 5.35 in. |
| April | 62.7 °F | 72.6 °F | 4.9 in. |
| May | 70.8 °F | 79.7 °F | 4.47 in. |
| June | 76.9 °F | 84.7 °F | 5.65 in. |
| July | 78.2 °F | 86.9 °F | 6.78 in. |
| August | 78.4 °F | 87.0 °F | 6.03 in. |
| September | 75.1 °F | 84.3 °F | 5.55 in. |
| October | 65.7 °F | 76.8 °F | 3.75 in. |
| November | 55.1 °F | 67.9 °F | 4.15 in. |
| December | 48.7 °F | 61.2 °F | 5.16 in. |
| Annual | 63.4 °F | 73.9 °F | 61.72 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 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |