August weather forecast
Houston, TX

A beautiful park in Root square overlooking the central business district of Houston, Texas, USA
A beautiful park in Root square overlooking the central business district of Houston, Texas, USA

Weather in August

The last month of the summer, August, is another tropical month in Houston, Texas, with temperature in the range of an average low of 77.5°F (25.3°C) and an average high of 94.3°F (34.6°C).

Temperature

The warmest month is August, with an average high-temperature of 94.3°F (34.6°C) and an average low-temperature of 77.5°F (25.3°C).

Heat index

In August, the average heat index is evaluated at a blazing hot 120°F (48.9°C). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, clothing, metabolic differences). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The months with the lowest humidity are August and October, with an average relative humidity of 70%.

Rainfall

In Houston, during 19.1 rainfall days, 3.9" (99mm) of precipitation is typically accumulated. Throughout the year, there are 180.5 rainfall days, and 35.35" (898mm) of precipitation is accumulated.

Snowfall

In Houston, snow does not fall in February through November.

Daylight

The average length of the day in August in Houston is 13h and 11min.
On the first day of August in Houston, sunrise is at 6:41 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 7:45 pm CDT.

Sunshine

August has the most sunshine of the year, with an average of 10.5h of sunshine.

UV index

The months with the highest UV index in Houston are May through August, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in August interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the warmest month in Houston?

August is the warmest month, with an average high-temperature of 94.3°F (34.6°C) and an average low-temperature of 77.5°F (25.3°C).

What is the temperature in August in Houston?

The average high-temperature, in August, in Houston, is 94.3°F (34.6°C), while the average low-temperature is 77.5°F (25.3°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is evaluated at 120°F (48.9°C).

What are the least humid months in Houston?

The months with the lowest humidity in Houston, Texas, are August and October, with an average relative humidity of 70%.

What is the average humidity in August in Houston?

In Houston, the average relative humidity in August is 70%.

How many days does it rain in August in Houston?

In Houston, Texas, during August, the rain falls for 19.1 days and regularly aggregates up to 3.9" (99mm) of precipitation.

When it does not snow in Houston?

February through November are months without snowfall in Houston.

What is the average length of the day in August in Houston?

The average day length in August is 13h and 11min.

What time are sunrise and sunset in August in Houston?

In August, on the first day of the month, sunrise is at 6:41 am and sunset at 8:14 pm. On the last day of the month, in Houston, sunrise is at 6:58 am and sunset at 7:45 pm CDT.

What month has the most sunshine in Houston?

With an average of 10.5h of sunshine, August has the most sunshine of the year.

How long on average sun shines in August in Houston?

The average sunshine duration in August is 10.5h.

What is the month with the highest UV index in Houston?

The months with the highest UV index in Houston, Texas, are May through August, with an average maximum UV index of 7.

What is the UV index intensity in August in Houston?

The average daily maximum UV index in August in Houston, Texas, is 7. A UV Index value of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Houston, TX

Average temperature in August - Houston, TX
  • Average high temperature in August: 94.3°F

The warmest month (with the highest average high temperature) is August (94.3°F).
The month with the lowest average high temperature is January (61.3°F).

  • Average low temperature in August: 77.5°F

The month with the highest average low temperature is August (77.5°F).
The coldest month (with the lowest average low temperature) is January (46°F).

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Average pressure in August
Houston, TX

Average pressure in August - Houston, TX
  • Average pressure in August: 29.95"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in August
Houston, TX

Average wind speed in August - Houston, TX
  • Average wind speed in August: 6.2mph

The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is September (5.9mph).

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Average humidity in August
Houston, TX

Average humidity in August - Houston, TX
  • Average humidity in August: 70%

The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are August and October (70%).

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Average rainfall in August
Houston, TX

Average rainfall in August - Houston, TX
  • Average rainfall in August: 3.9"

The wettest month (with the highest rainfall) is September (4.49").
The driest month (with the least rainfall) is February (1.77").

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Average rainfall days in August
Houston, TX

Average rainfall days in August - Houston, TX
  • Average rainfall days in August: 19.1 days

The month with the highest number of rainy days is September (19.5 days).
The month with the least rainy days is January (11.8 days).

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Average snowfall in August
Houston, TX

Average snowfall in August - Houston, TX
  • Average snowfall in August: 0"

The month with the highest snowfall is December (0.08").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in August
Houston, TX

Average snowfall days in August - Houston, TX
  • Average snowfall days in August: 0 days

The months with the highest number of snowfall days are January and December (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in August /
Average sunshine in August
Houston, TX

Average daylight in August / Average sunshine in August - Houston, TX
  • Average daylight in August: 13h and 11min

The month with the longest days is June (Average daylight: 14h and 2min).
The month with the shortest days is December (Average daylight: 10h and 16min).

  • Average sunshine in August: 10h and 30min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).

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Average sunshine days in August
Houston, TX

Average sunshine days in August - Houston, TX
  • Average sunshine days in August: 9.6 days

The month with the most sunshine days is January (16.3 days).
The month with the least sunshine days is September (7.9 days).

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Average UV index in August
Houston, TX

Average UV index in August - Houston, TX
  • Average UV index in August: 7

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in August
Houston, TX

Average cloud cover in August - Houston, TX
  • Average cloud cover in August: 27

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in August
Houston, TX

Average visibility in August - Houston, TX
  • Average visibility in August: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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