San Antonio Weather in August
August in San Antonio averages 31°C (88°F) during the day and 25°C (77°F) at night. The perfect conditions and low rainfall make it a solid month to visit.
Rainfall in San Antonio in August
Historically, the month has about 5 days of rain, averaging 17 mm (0.7 in) in total. When rain does fall, showers tend to be light and brief. Most days will be dry.
Temperature in San Antonio in August
If you're visiting San Antonio in August, expect perfect temperatures with highs of 31°C (88°F) and overnight lows of 25°C (77°F). The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference. 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
The city usually sees around 304 hours of sunlight, indicating many sunny days — a great month for sightseeing.
Average water temperature in August
With water at 26°C (79°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.If your ideal day consists of dry skies and pleasant temperatures, March, April, May, June, September, October and November typically offer the best circumstances for San Antonio.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Antonio's climate page.
San Antonio Temperature in August
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Water Temperature
26°C (79°F) *
Chance of Rain
15%
Precipitation
17 mm (0.7 in)
Rainy days
5 days
Humidity
70% *
Sunshine
304 hours *
Percentage Sunshine
79% *
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 31°C (88°F). Nights are warm, with lows around 23°C (73°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.
- The hottest August day on record in San Antonio reached 40°C (104°F) (August 13, 2022).
- The lowest daytime temperature in August was 21°C (70°F), recorded on August 28, 1977.
- Nighttime temperatures dropped to 15°C (59°F) on August 29, 1977, marking the coldest August night on record.
Best Places in Spain in August
Find out more about the weather in Spain and which places have the best travel conditions in this month. See all of Spain in August →
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What to Wear in San Antonio in August
Warm but pleasant conditions in San Antonio in August. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Dry conditions mean you won't need to worry about rain protection. The water temperature sits at about 26°C (79°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.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 Spain, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full San Antonio climate overview or explore weather in Spain.
