Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
The highest temperatures are recorded in August, with averages reaching a high of 96.6°F (35.9°C) and a low of 75.7°F (24.3°C).Heat index
August's heat index is computed to be a life-threatening hot 116.6°F (47°C). Beware: Heat exhaustion along with heat cramps are on the cards. Heatstroke could result from sustained physical activity.From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. Overheating and potential dehydration arise when body heat gain eclipses its release capability.
Humidity
August is the least humid month, with an average relative humidity of 59%.Rainfall
In August, the rain falls for 9.8 days. Throughout August, 1.5" (38mm) of precipitation is accumulated. Throughout the year, in San Antonio, there are 144.5 rainfall days, and 22.6" (574mm) of precipitation is accumulated.Snowfall
March through November are months without snowfall.Daylight
In August, the average length of the day is 13h and 10min.On the first day of August, sunrise is at 6:54 am and sunset at 8:26 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 7:56 pm CDT.
Sunshine
In August, the average sunshine in San Antonio is 9.9h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In August, the maximum UV index of 7 suggests these recommendations:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the hottest?
How hot does it get in August?
What is the least humid month?
What is the average humidity in August?
How many days does it rain in August in San Antonio?
When it does not snow?
What is the average length of the day in August?
When is the sunrise / sunset in August?
How many hours of sunshine does San Antonio have in August?
What are the months with the highest UV index?
How high is the UV index in August?
Average temperature in August
San Antonio, TX
- Average high temperature in August: 96.6°F
The warmest month (with the highest average high temperature) is August (96.6°F).
The month with the lowest average high temperature is January (61.7°F).
- Average low temperature in August: 75.7°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in August
San Antonio, TX
- Average pressure in August: 29.91"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in August
San Antonio, TX
- Average wind speed in August: 7.1mph
The windiest month (with the highest average wind speed) is May (9mph).
The calmest month (with the lowest average wind speed) is September (6.5mph).
Average humidity in August
San Antonio, TX
- Average humidity in August: 59%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (59%).
Average rainfall in August
San Antonio, TX
- Average rainfall in August: 1.5"
The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in August
San Antonio, TX
- Average rainfall days in August: 9.8 days
The month with the highest number of rainy days is September (17 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in August
San Antonio, TX
- Average snowfall in August: 0"
The months with the highest snowfall are January and February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in August
San Antonio, TX
- Average snowfall days in August: 0 days
The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in August /
Average sunshine in August
San Antonio, 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: 9h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in August
San Antonio, TX
- Average sunshine days in August: 19.8 days
The month with the most sunshine days is January (20.3 days).
The months with the least sunshine days are May and September (11.8 days).
Average UV index in August
San Antonio, TX
- Average UV index in August: 7
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in August
San Antonio, TX
- Average cloud cover in August: 23
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in August
San Antonio, 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).
San Antonio, Texas, USA
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