San Antonio (TX) Weather and Climate: A Comprehensive Guide
San Antonio has a combination of a humid subtropical climate and a semi-arid climate. The weather is heavily influenced by the Gulf of Mexico. Because of this influence, the average temperature during the winter months is just slightly higher than in more northern Texas towns. In general San Antonio has very hot, long, and humid summers and mild to cool winters.
Average precipitation is distributed fairly evenly throughout the year. During the warmest days, the mercury can rise considerably, and temperatures above 40°C is no exception. The city is subject to cold fronts during winter with cool to cold nights, typically seeing minimum temperatures at or near freezing.
Average maximum day and minimum night temperature
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 in August. In January, the coolest month of the year, temperatures drop to a moderate 18°C.
At night, you can expect cooler temperatures, with averages dropping to around 4°C during this month. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Generally, San Antonio has a moderate amount of precipitation, averaging 818 mm of rainfall annually. San Antonio can be quite wet during May, receiving approximately 130 mm of precipitation over 9 rainy days. In contrast December, experiences much drier conditions, with 34 mm of rainfall, 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
Sunshine over the year
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
Average humidity
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%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
clear and no rain broken clouds and no rain broken clouds and no rainForecast for San Antonio (TX)
4 m/s
5 m/s
6 m/s
The best time of year to visit San Antonio in the United States of America
During the months of February, March and November you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
August has an average maximum temperature of 36°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 18°C.
May tops the wettest month list with 130 mm of rainfall.
December is the driest month with 34 mm of precipitation.
July is the sunniest month with an average of 310 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
