Magnolia Beach, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.3 °C (low) to 25.8 °C (high). Annual precipitation averages 1077.2 Millimeters. Magnolia Beach is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.6 °C | 17.5 °C | 77.98 mm |
| February | 9.7 °C | 19.2 °C | 54.1 mm |
| March | 13.4 °C | 21.9 °C | 74.42 mm |
| April | 16.9 °C | 25.2 °C | 62.48 mm |
| May | 21.3 °C | 28.6 °C | 102.36 mm |
| June | 24.4 °C | 31.3 °C | 125.48 mm |
| July | 25.3 °C | 32.4 °C | 95 mm |
| August | 25.1 °C | 33 °C | 82.55 mm |
| September | 22.8 °C | 31.3 °C | 137.16 mm |
| October | 18.5 °C | 27.6 °C | 110.49 mm |
| November | 13.4 °C | 22.4 °C | 84.33 mm |
| December | 8.9 °C | 18.6 °C | 70.87 mm |
| Annual | 17.3 °C | 25.8 °C | 1077.22 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 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |