San Antonio Weather in August
San Antonio in August sees extremely high daytime temperatures of 36°C (97°F) and nighttime lows of 24°C (75°F). Rainfall is fairly high this month at around 65 mm (2.6 in), so pack a rain jacket to stay dry.
Rainfall in San Antonio in August
You can typically expect 5 days of rain this month, averaging around 65 mm (2.6 in). Rainfall tends to arrive in short, intense showers this month. Rain days are few, but the showers can be surprisingly heavy.
Temperature in San Antonio in August
August in San Antonio sees highs of 36°C (97°F) and lows of 24°C (75°F) overnight. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. With lows around 24°C (75°F), the nights are warm enough that a sheet is usually all you need for bedding. The average temperatures are warm, but some days will be hotter. Make sure to dress in light, breathable clothing and drink plenty of water.
Sunshine in San Antonio in August
Expect sunny days throughout the month, with an estimated 295 hours of sunshine. This makes it a pleasant time to visit San Antonio.August in San Antonio has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Antonio's climate page.
San Antonio Temperature in August
Min Temperature
24°C (75°F)
Max Temperature
36°C (97°F)
Chance of Rain
17%
Precipitation
65 mm (2.6 in)
Rainy days
5 days
Humidity
65%
Sunshine
295 hours
Percentage Sunshine
72%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Antonio typically stay consistent throughout August, with daily highs averaging around 36°C (97°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for San Antonio in August
Browse day-by-day weather records for San Antonio spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Antonio historical weather extremes in August
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in San Antonio.
- On August 28, 2011, temperatures climbed to 44°C (111°F), marking the warmest August day on record.
- The coldest August day was on August 27, 2017, with a maximum of 26°C (79°F).
- The lowest overnight temperature recorded in August was 16°C (61°F) (August 29, 1992).
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
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What to Wear in San Antonio in August
Pack for serious heat in San Antonio in August. Prioritize clothing that breathes and doesn't cling or stick. Lightweight cotton, linen, and moisture-wicking fabrics are ideal. A wide hat provides welcome shade. Wet weather is likely, so pack waterproof gear for multiple rainy days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in San Antonio in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Antonio climate overview or explore weather in the United States of America.
