Bourg, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 60.1 °F (low) to 78.1 °F (high). Annual precipitation averages 65.7 Inches. Bourg is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.6 °F | 63.0 °F | 5.3 in. |
| February | 47.5 °F | 66.6 °F | 4.23 in. |
| March | 53.3 °F | 72.1 °F | 4.31 in. |
| April | 59.5 °F | 77.3 °F | 4.94 in. |
| May | 67.3 °F | 84.1 °F | 5.61 in. |
| June | 72.8 °F | 88.5 °F | 7.54 in. |
| July | 74.4 °F | 90.2 °F | 8.27 in. |
| August | 74.2 °F | 90.6 °F | 7.59 in. |
| September | 70.8 °F | 87.3 °F | 5.68 in. |
| October | 61.0 °F | 80.7 °F | 4.07 in. |
| November | 50.9 °F | 71.7 °F | 3.84 in. |
| December | 45.7 °F | 65.4 °F | 4.28 in. |
| Annual | 60.1 °F | 78.1 °F | 65.66 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |