South Padre Island - Average temperatures (1991-2020) Month Min (°C) Max (°C) Mean (°C) Min (°F) Max (°F) Mean (°F) January: 11.1: 21.2: 16.1: 52: 70: 61.1: February: 13.3: 23.1: 18.2: 56: 74: 64.8: March: 16.4: 25.6: 21: 62: 78: 69.8: April: 19.7: 28.3: 24: 67: 83: 75.2: May: 22.9: 31.1: 27: 73: 88: 80.6: June: 24.9: 33.1: 29: 77: 92: 84. South Padre Island, Texas - Climate and weather forecast by month. Detailed climate information with charts - average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and UV index data.