August weather forecast and climate
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
August, the last month of the summer, in Houston, is another tropical month, with average temperature varying between 94.3°F (34.6°C) and 77.5°F (25.3°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 burning hot 120°F (48.9°C). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, differences in body mass, height, and shape, clothing, and pregnancy affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise 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. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

In Houston, Texas, during 19.1 rainfall days, 3.9" (99mm) of precipitation is typically accumulated. In Houston, during the entire year, the rain falls for 180.5 days and collects up to 35.35" (898mm) of precipitation.

Snowfall

February through November are months without snowfall.

Daylight

In August, the average length of the day is 13.2h.

Sunshine

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

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index in Houston. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the warmest month in Houston?

August is the warmest month in Houston, 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, is 94.3°F (34.6°C), while the average low-temperature is 77.5°F (25.3°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines relative humidity and air temperature, is evaluated at 120°F (48.9°C).

What are the least humid months in Houston?

August and October, with an average relative humidity of 70%, are the least humid months in Houston.

What is the average humidity in August in Houston?

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

How many days does it rain in August in Houston?

In Houston, in August, during 19.1 rainfall days, 3.9" (99mm) of precipitation is typically accumulated.

When it does not snow in Houston?

February through November are months without snowfall.

How many hours of daylight does Houston have in August?

The average length of the day in August in Houston is 13.2h.

What month has the most sunshine in Houston?

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

How many hours of sunshine does Houston have in August?

The average sunshine in August in Houston, Texas, is 10.5h.

When is the highest UV index in Houston?

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

What is the UV index reading in August in Houston?

In August, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV rays.
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).

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

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

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).

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

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

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").

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).

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

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

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

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

Average daylight in August / Average sunshine in August - Houston, TX
  • Average daylight in August: 13.2h

The month with the longest days is June (Average daylight: 14h).
The month with the shortest days is December (Average daylight: 10.3h).

  • Average sunshine in August: 10.5h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is December (Average sunshine: 4.8h).

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).

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

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).

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).

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

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