August weather forecast
Galveston, TX

August continues riding the crest of Galveston’s summer wave, witnessing the year's highest average low temperature of 81.9°F. This peak summer month also faces a notably high amount of rainfall, experiencing an average of 3.46". 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

August is the warmest month in Galveston, Texas, with the temperature often reaching an average high of 87.4°F and an average low of 81.9°F.

Heat index

The average heat index in August is computed to be a torrid 102.2°F. Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', evaluates the perceived heat by adding the effect of moisture in the air. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. 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 highly critical to babies and toddlers. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In August, the average relative humidity is 75%.

Rainfall

In Galveston, during August, the rain falls for 19.4 days and regularly aggregates up to 3.46" of precipitation. Throughout the year, in Galveston, there are 161.9 rainfall days, and 24.33" of precipitation is accumulated.

Snowfall

In Galveston, snow does not fall in March through December.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 87.3°F.
Note: Water temperatures higher than 86°F might not provide the relief swimmers often seek.

Daylight

In Galveston, the average length of the day in August is 13h and 10min.
On the first day of the month, sunrise is at 6:39 am and sunset at 8:11 pm. On the last day of August, in Galveston, Texas, sunrise is at 6:56 am and sunset at 7:42 pm CDT.

Sunshine

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

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 estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 7 in August leads to these recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be attentive! The UV exposure is heightened with reflections from sand and water.