Bayside, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.2 °C (low) to 26.8 °C (high). Annual precipitation averages 889.8 Millimeters. Bayside is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.9 °C | 18.6 °C | 53.34 mm |
| February | 10.2 °C | 20.6 °C | 45.97 mm |
| March | 13.6 °C | 23.4 °C | 67.31 mm |
| April | 17.1 °C | 26.4 °C | 51.31 mm |
| May | 21.3 °C | 29.6 °C | 83.82 mm |
| June | 24 °C | 32.3 °C | 93.47 mm |
| July | 24.8 °C | 33.1 °C | 80.01 mm |
| August | 24.6 °C | 33.9 °C | 68.58 mm |
| September | 22.6 °C | 32.1 °C | 140.72 mm |
| October | 18.4 °C | 28.6 °C | 90.17 mm |
| November | 12.9 °C | 23.6 °C | 63.25 mm |
| December | 8.9 °C | 19.8 °C | 51.82 mm |
| Annual | 17.2 °C | 26.8 °C | 889.77 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 |