San Antonio Weather & Climate: Best Time to Visit

With minimal seasonal shifts, San Antonio experiences a constant climate year-round. Typically, average maximum daytime temperatures range from a pleasant 20°C (68°F) in August to a pleasant 19°C (66°F) in the coolest month, December.

Nights vary from 11°C (52°F) in August to around 10°C (50°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

San Antonio has a notably wet climate with abundant precipitation, recording 3431 mm (135 in) of rainfall per year. The climate in San Antonio shows significant variation throughout the year. Expect heavy rainfall in April, the wettest month, with an average of 383 mm (15 in) of precipitation over 18 rainy days.

In contrast, the driest month August offers drier and sunnier days, with around 140 mm (5.5 in) of rainfall over 5 rainy days. For more details, please visit our San Antonio Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, San Antonio serves as an ideal destination. Expect longer, more sun-filled days in August with an average of 8.6 hours of sunshine daily, and embrace the darker days in March, offering only 4.1 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in San Antonio.

The city experiences its highest humidity in April, reaching 84%. In August, the humidity drops to its lowest level at 69%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The average wind speed over the year ranges from () to 1 m/s (2 knots). It is lower in January, February, March, April, May, June, September, October, November and December and higher in July and August. What does this mean?

The mean monthly wind speed over the year (meters per second)