Houston Weather in August

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

This page gives detailed information on the typical August temperature, precipitation, sun, humidity, wind and storms for Houston. The numbers here are historical averages based on temperature and rainfall measurements gathered at Houston Hobby Airport and other climate data from George Bush Intercontinental Airport.

Temperature Weather iconTemperature

94 °F August average high 34 °C
77 °F August average low 25 °C

August is Houston's hottest month overall, with temperatures peaking from the 1st to 13th. These dates have daily highs averaging 94 °F (34 °C) and lows of 77 °F (25 °C).

26 days 90 °F max. or more (32 °C)
1 day 70 °F min. or less (21 °C)

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

Normally August never cools down to 60 °F (16 °C) at night.

Rainy Weather iconRain

5.4 in total precipitation 138 mm
10 days of rain

Half the time, Houston receives 2.0 to 7.2 inches (51 to 183 mm) of rainfall in August. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

68 % sunshine
6 days 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.

Humid Weather 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

Windy Weather iconWind

6.1 mph August wind speed average 9.8 kph

August is the least windy month at Houston.

Stormy Weather iconStorms

3 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.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.

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