What August feels like in San Antonio
August is the height of summer in San Antonio — the warmest month of the year. Midday heat is intense, and most people keep to shade or air-conditioning in the afternoon. Nights bring little relief: even the coolest hour of the night stays very warm. The air carries some moisture, so hot spells feel a little sticky.
Rain in San Antonio in August
Most days stay dry; rain arrives about one day in 5. Rain tends to come in heavy bursts: about 9.1 mm (0.4 in) on an average rainy day. Across the year San Antonio averages about 8.5 mm per rainy day, so August is typical. It is among the three driest months of the year.
Daylight and sunshine in August
On 15 August the sun rises at about 7:02 am and sets around 8:16 pm local time, giving 13 h 14 min of daylight. Compared with mid-July, the day has lost 38 min. About 90% of daylight hours are sunny; in short, skies are mostly clear.
How August compares to the rest of the year
August is the warmest month of the year in San Antonio. Compared with July, afternoons are 0.9°C (1.6°F) warmer, with 17 mm less rain. After this the year turns: September is already cooler. By September, typical highs are 32.2°C (90°F).
Who August suits
- Sightseeing: less ideal — midday heat makes long walks hard.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
- Museums & indoor: a good choice — a cool break during the hottest hours.
Tips for visiting San Antonio in August
Sun Protection
Loose, breathable clothing plus sunscreen and a wide-brimmed hat.
Quick questions
How warm is San Antonio in August?
Afternoons average 35.7°C (96.3°F) and nights about 25.1°C (77.2°F) — very hot by most people's standards. It is the warmest month of the year.
Does it rain a lot in San Antonio in August?
Not especially. There are about 6 rainy days (55 mm), mostly moderate rain.
What should I wear in San Antonio in August?
The numbers point to sun protection. There is little need to change for the evening.
Is August or September better for visiting San Antonio?
August, clearly: it ranks #9 of 12 among San Antonio's months, against #12 for the other. September is cooler and has more rainy days.