The sharpest risk at San Antonio Missions isn't weather — it's the surrounding urban environment. Bexar County recorded a violent crime rate of 416 per 100,000 residents in 2023, well above national averages, and the park's mission sites sit within active city neighborhoods rather than a remote wilderness setting. Visitors moving between the four mission locations on foot or by trail should treat this less like a backcountry trip and more like navigating an unfamiliar city.
Park during daylight hours in designated lots near each mission rather than on side streets, and keep valuables locked out of sight in your vehicle — smash-and-grab theft is the most common issue in urban park corridors like this one. On the weather side, 13 flash flood events in the county mean the San Antonio River Trail can rise quickly after storms; check radar before heading out on the connecting trail segments and move to higher ground if skies darken suddenly.
Top recorded hazards in Bexar County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Hail 30
- Flash Flood 13
- Thunderstorm Wind 8
Gear keyed to this park's risks
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About San Antonio Missions National Historical Park
Welcome to San Antonio Missions, a National Park Service site and the only UNESCO World Heritage Site in Texas. Each mission in the park is a center of community and has been since the early 1700s. They changed life in this region, introducing new technologies while enforcing new cultural guidelines. As you visit, reflect on change, culture, power, and how people have used the land.
Weather
Over the course of a year, the temperature typically varies from 40°F to 95°F and is rarely below 29°F or above 100°F. The warm season lasts from May through September with an average daily high temperature above 90°F and a low of 75°F. The cold season lasts from November through February with an average daily high below 68°F and an average low of 40°F. The relative humidity ranges from 40-80% over the course of the year, which can be very uncomfortable to many people.