August weather forecast
Galveston, TX

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the colorful red night sky in the seaside city of Galveston in Texas
the colorful red night sky in the seaside city of Galveston in Texas

Weather in August

August continues riding the crest of Galveston’s summer wave, witnessing the year's highest average low temperature of 81.9°F (27.7°C). This peak summer month also faces a notably high amount of rainfall, experiencing an average of 3.46" (88mm). Aside from the weather readings, which continue to range in the summer spectrum, August evenings remain lively and warm. Local activities persist as Galveston residents use the last dregs of extended daylight hours. The typically clear skies provide ample outdoor opportunities despite the warm nights.

Temperature

Galveston's warmest temperatures are experienced in August, with average high temperatures of 87.4°F (30.8°C) and lows of 81.9°F (27.7°C).

Heat index

Throughout August, the heat index is computed to be a fiery hot 102.2°F (39°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

The average relative humidity in August in Galveston, Texas, is 75%.

Rainfall

In Galveston, Texas, in August, during 19.4 rainfall days, 3.46" (88mm) of precipitation is typically accumulated. In Galveston, during the entire year, the rain falls for 161.9 days and collects up to 24.33" (618mm) of precipitation.

Snowfall

March through December are months without snowfall.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 87.3°F (30.7°C).
Note: Intense water activities might lose their appeal in waters that are warmer than 86°F (30°C).

Daylight

In Galveston, the average length of the day in August is 13h and 10min.
On the first day of August, sunrise is at 6:39 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 7:41 pm CDT.

Sunshine

August has the most sunshine of the year, with an average of 10.9h of sunshine.

UV index

The months with the highest UV index in Galveston are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: A maximum high UV index of 7 in August translates into the following recommendations:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Caution! The mirror effect of sand and water ups the UV radiation strength.
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Frequently asked questions

What part of the year is the hottest in Galveston?

The warmest month in Galveston is August, with an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 81.9°F (27.7°C).

How hot does it get in Galveston in August?

The high-temperature, in August, in Galveston, is 87.4°F (30.8°C), while the low-temperature averages to 81.9°F (27.7°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, is computed to be 102.2°F (39°C).

What is the average humidity in August in Galveston?

In Galveston, Texas, the average relative humidity in August is 75%.

How much does it rain in Galveston in August?

In Galveston, Texas, during August, the rain falls for 19.4 days and regularly aggregates up to 3.46" (88mm) of precipitation.

When it does not snow in Galveston?

March through December are months without snowfall in Galveston.

When is the ocean warmest in Galveston?

The month with the warmest seawater in Galveston is August, with an average ocean temperature of 87.3°F (30.7°C).

What is the ocean temperature in August in Galveston?

In Galveston, the average seawater temperature in August is 87.3°F (30.7°C). The water temperature above 86°F (30°C) is arguably regarded as unpleasant. The primary purpose of entering the water - cooling down from sunshine and high temperatures - is lost.

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

In August, the average day length in Galveston, Texas, is 13h and 10min.

What time are sunrise and sunset in August in Galveston?

In August, on the first day of the month, sunrise is at 6:39 am and sunset at 8:11 pm. On the last day of the month, in Galveston, Texas, sunrise is at 6:56 am and sunset at 7:41 pm CDT.

What month has the most sunshine in Galveston?

With an average of 10.9h of sunshine, August has the most sunshine of the year in Galveston.

How long on average sun shines in August in Galveston?

The average sunshine duration in August is 10.9h.

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

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

How high is the UV index in August in Galveston?

In August, the average daily maximum UV index in Galveston 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 days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Galveston, TX

Average temperature in August - Galveston, TX
  • Average high temperature in August: 87.4°F

The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is January (59.7°F).

  • Average low temperature in August: 81.9°F

The month with the highest average low temperature is August (81.9°F).
The coldest month (with the lowest average low temperature) is January (51.6°F).

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Average pressure in August
Galveston, TX

Average pressure in August - Galveston, 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
Galveston, TX

Average wind speed in August - Galveston, TX
  • Average wind speed in August: 9.4mph

The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is August (9.4mph).

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Average humidity in August
Galveston, TX

Average humidity in August - Galveston, TX
  • Average humidity in August: 75%

The months with the highest relative humidity are February and March (81%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in August
Galveston, TX

Average rainfall in August - Galveston, TX
  • Average rainfall in August: 3.46"

The wettest month (with the highest rainfall) is September (4.29").
The driest months (with the least rainfall) are February and March (0.75").

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Average rainfall days in August
Galveston, TX

Average rainfall days in August - Galveston, TX
  • Average rainfall days in August: 19.4 days

The month with the highest number of rainy days is September (19.9 days).
The month with the least rainy days is January (10.1 days).

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Average snowfall days in August
Galveston, TX

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

The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

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Average sea temperature in August
Galveston, TX

Average sea temperature in August - Galveston, TX
  • Average sea temperature in August: 87.2°F

The best month for swimming (with the highest average sea temperature) is August (87.2°F).
The coldest month (with the lowest average sea temperature) is January (56.5°F).

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

Average daylight in August / Average sunshine in August - Galveston, TX
  • Average daylight in August: 13h and 1min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

  • Average sunshine in August: 10h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).

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Average sunshine days in August
Galveston, TX

Average sunshine days in August - Galveston, TX
  • Average sunshine days in August: 8.3 days

The month with the most sunshine days is January (18.2 days).
The month with the least sunshine days is August (8.3 days).

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Average UV index in August
Galveston, TX

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

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 4).

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Average cloud cover in August
Galveston, TX

Average cloud cover in August - Galveston, TX
  • Average cloud cover in August: 26

The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June, July, August and October (Cloud cover 26).

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Average visibility in August
Galveston, TX

Average visibility in August - Galveston, 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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Galveston, Texas, USA

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