San Antonio Weather in August

San Antonio in August sees moderate temperatures, with highs around 16°C (61°F) and overnight lows of 6°C (43°F). Around 20 mm (0.8 in) of rainfall is typical, so a light rain jacket is a sensible addition to your bag.

Rainfall in San Antonio in August

You can typically expect 3 days of rain this month, averaging around 20 mm (0.8 in). Rain is scarce this month and when it does fall, it tends to be light. Unlikely to disrupt plans significantly.

Temperature in San Antonio in August

San Antonio in August gets highs of 16°C (61°F) during the day and drops to 6°C (43°F) at night. The winter season is characteristic of August. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows around 6°C (43°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Wind Speed in San Antonio in August

August sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

Average water temperature in August

The water temperature is only 10°C (50°F) this month, cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.

If you're looking for dry conditions and comfortable temperatures, August may not be the ideal month to visit San Antonio. Our weather planner can help you explore destinations with more pleasant weather conditions.