Houston Weather in August

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August is the hottest month for Houston, Texas. That means most days have highs in the mid 90s °F (around 35 °C). Thunderstorms are common now and so is sunshine.

This page gives detailed information on the typical August weather for Houston. You can jump directly to data and descriptions for:

The numbers here are historical averages based on climate data gathered at the George Bush Intercontinental Airport, located north of downtown Houston.

temperature iconTemperature

95 °F August average high 35 °C
75 °F August average low 24 °C

In most years, Houston averages a daily maximum temperature for August that's between 92 and 97 degrees Fahrenheit (34 to 36 degrees Celsius). The minimum temperature usually falls between 73 and 76 °F (23 to 25 °C).

August is Houston's hottest month overall, with temperatures peaking from the 5th to 12th. These dates have daily highs averaging 95.0 °F (35.0 °C) and lows of 75.1 °F (23.9 °C).

27 days 90 °F maximum or above (32 °C)
2 days 70 °F minimum or below (21 °C)

Usually every day in August is at least 80 °F (27 °C) in Houston. The city averages 2 days this month when the thermometer reaches into the 100s °F (over 38 °C).

Normally August never gets as cool as 60 °F (16 °C).

precipitation iconRain

3.8 inches total August precipitation 96 millimetres
8 days of rain

Half the time, Houston receives 2 to 5 inches (48 to 124 mm) of rainfall in August. One in four years has drier weather, while another one in four is wetter.

sunshine iconSun

68 % sunshine in August
6 days with clear skies

The sun's rays reach the ground in Houston during 68 percent of daylight hours on average in August, for a total of 277 hours in the month. Typically on 6 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in August at Houston lasts for 13 hours and 10 minutes a day on average. The longest day of the month is the 1st with 13 hours and 33 minutes of daylight. By the end of the month, the days have shortened to 12:46 from sunrise to sunset. These durations can vary by a minute or two from year to year.

humidity iconHumidity

75 % August average humidity

The relative humidity in Houston during August usually peaks at 93 percent in the morning then drops to 55 percent by mid afternoon.

Local Time12 am3 am6 am9 am12 pm3 pm6 pm9 pm
Humidity % 88 92 93 74 58 55 63 79

wind iconWind

6.1 mph August wind speed average 9.8 kph

August is the least windy month at Houston.

lightning cloud iconStorms

2 days rainfall of 0.5 inches (13 mm) or more
10 days with thunderstorms in August
14 % chance a named storm approaches

There's a 4 percent probability that a hurricane will approach within 100 miles (165 km) of Houston during August. The chance of a major hurricane (category 3 to 5) reaching the area is 1 percent.

Reference

These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.

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