San Antonio Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from very warm to moderate in San Antonio. Average maximum daytime temperatures range from a very warm 31°C (88°F) in August, the warmest time of the year, to a moderate 16°C (61°F) during cooler months like February.

At night, you can expect temperatures ranging from 25°C (77°F) in August to around 11°C (52°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

With annual rainfall averaging 350 mm (14 in), San Antonio maintains relatively low precipitation levels throughout the seasons. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, November it receives moderate rainfall, averaging 51 mm (2 in) of precipitation, recorded across 11 rainy days. In contrast, the driest month July brings less rainfall, with 3.3 mm (0.1 in) over 3 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

Seasonal changes in sunshine hours are quite dramatic in San Antonio. While July receives considerable daily sunshine with up to 11.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 5.1 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 mean water temperature over the year ranges from 14°C (57°F) in February to 26°C (79°F) in August.

Water temperature over the year

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

The city experiences its highest humidity in January, reaching 75%. In July, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year