Brazoria, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16 °C (low) to 26.3 °C (high). Annual precipitation averages 1278.6 Millimeters. Brazoria is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.8 °C | 17.7 °C | 100.58 mm |
| February | 9 °C | 19.4 °C | 68.07 mm |
| March | 12.3 °C | 22.6 °C | 80.01 mm |
| April | 15.7 °C | 25.7 °C | 89.41 mm |
| May | 20 °C | 29.2 °C | 107.7 mm |
| June | 23 °C | 32.2 °C | 121.16 mm |
| July | 23.7 °C | 33.2 °C | 106.93 mm |
| August | 23.7 °C | 33.7 °C | 122.43 mm |
| September | 21.4 °C | 31.7 °C | 156.46 mm |
| October | 16.6 °C | 28 °C | 119.38 mm |
| November | 11.6 °C | 22.9 °C | 104.65 mm |
| December | 7.9 °C | 18.9 °C | 101.85 mm |
| Annual | 16 °C | 26.3 °C | 1278.63 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |