UV Index
UV Index
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Today's UV index in San Antonio, United States 
will be up to 9.3, indicating a very high level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
With a UV index of 9.3 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.
The UV index in San Antonio, Texas, averages 6.7 during summer months, reaching a high of 10 in June. This index measures the strength of the sun's UV rays, with higher numbers indicating a greater risk of sun damage.
San Antonio experiences a subtropical climate, marked by hot summers and mild winters. The city has two main seasons: a long, hot summer and a short, mild winter. Spring and autumn serve as brief transition periods.
Compared to its region and neighboring countries, San Antonio shares similar subtropical characteristics with other southern states. However, it has more extreme temperature fluctuations than many Latin American countries, like Mexico, due to its inland location and higher latitude.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in San Antonio. It's designed to provide you with a better understanding of the yearly weather and sun exposure.