UV Index
UV Index
Today's UV index in San Antonio, United States 
will be up to 10.1, indicating a very high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-01
With a UV index of 10.1 in San Antonio, it's crucial to safeguard your skin from harmful UV rays. Protect yourself by minimizing sun exposure, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours.
San Antonio’s UV index ranges from low in winter to very high in summer, often reaching 8 to 10 on hot days. This means the sun’s rays are strongest in summer months.
San Antonio experiences hot, humid summers with temperatures often above 90°F (32°C), and mild winters with temperatures around 50-60°F (10-15°C). Rainfall peaks in spring and early fall, with drier winters.
Compared to nearby cities in Texas, San Antonio is warmer than Dallas in winter but cooler than Houston in summer. It is drier than Houston and eastern states but wetter than western Texas and New Mexico.
See the UV index hour by hour for San Antonio, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.