San Antonio (TX) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from very hot to moderate in San Antonio. Average daytime temperatures reach a very hot 36°C (97°F) in August. In January, the coolest month of the year, temperatures drop to a moderate 18°C (64°F).

At night, temperatures range from around 24°C (75°F) in August to 4°C (39°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, San Antonio has a moderate amount of precipitation, averaging 818 mm (32 in) of rainfall annually. San Antonio can be quite wet during May, receiving approximately 130 mm (5.1 in) of precipitation over 9 rainy days.

In contrast, during the driest month (December), you will experience much drier conditions, with 34 mm (1.3 in) of precipitation spread across 8 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

San Antonio can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.3 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.0 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

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

The city experiences its highest humidity in May, reaching 71%. In March, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year