Houston Seasonal temperature break down - The average median temperature March through May is approximately 70°F with highs averaging at 80°F and lows averaging at 63°F. June through August has an approximate average median temperature of 84°F with highs averaging at 96°F, lows typically average at 77°F. Average median temperatures September through November average out at 72°F, high temperatures average out at 82°F and lows average at 65°F.
The average median temperature December through February is approximately 58°F with highs averaging at 68°F, lows average out at 51°F.
The average Houston annual median temperature averages out at approximately 71°F. The coldest month in Houston is January with a median temperature of 55°F, the average high for the month of January is 65°F with an average low of 48.2°F. The hottest month in Houston is August with an approximate median temperature of 86°F, the average high for the month of August is 98°F with an average low of 79°F.