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 (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

During the warmest month, August, temperatures average a high of 87.4°F (30.8°C) and a low of 81.9°F (27.7°C).

Heat index

August's heat index is calculated to be a torrid 102.2°F (39°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

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

Rainfall

In Galveston, in August, it is raining for 19.4 days, with typically 3.46" (88mm) of accumulated precipitation. 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: The charm of diving into cool waters is arguably lost when temperatures surpass 86°F (30°C).

Daylight

In August, the average length of the day 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

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

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Galveston. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In August, the average maximum UV index of 7 translates into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be vigilant! The Sun's UV rays get a boost from sand and water reflections.