San Antonio · August
Run in the pre-dawn.
Average highs hit 96°F. August is the hottest stretch of the year. Heat builds fast after sunrise — the pre-dawn hour is the only reliably comfortable window.
Avg high / low
96° / 77°F
Humidity
62%
Rain days
12/mo
Wind
12 mph
What August feels like in San Antonio
Sunrise
07:02
Mid-month average
Sunset
20:12
Mid-month average
Time-of-day breakdown
Morning
Cool relative to the day's peak, but heat builds fast. By 10 AM you're already chasing comfort.
Midday
Heat peaks here. Skip unless you've got shade and pace tolerance.
Evening
Cools off after sunset but still warm. Good for easy efforts; avoid hard intervals if you're chasing pace.
What to wear running in San Antonio in August
The kit for August in San Antonio: light, breathable, and moisture-wicking — singlet or short-sleeve only, a water-resistant cap or jacket on standby.
August vs the surrounding months
vs July
0° avg high
+1 rain days
San Antonio in July →
August
96°F avg high
12 rain days
Best: pre-dawn
vs September
+6° avg high
-3 rain days
San Antonio in September →
Frequently Asked Questions
What is the best time of day to run in San Antonio in August?+
Pre-dawn. Heat builds fast after sunrise — the pre-dawn hour is the only reliably comfortable window.
What's the average temperature in San Antonio in August?+
Average high 96°F, average low 77°F.
How does August compare to surrounding months in San Antonio?+
Compared to July (avg high 96°F), August is cooler. Compared to September (avg high 90°F), August is warmer.
Does it rain often in San Antonio in August?+
Expect about 12 measurable rain days in August, on average.