UV Index
UV Index
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Today's UV index in San Antonio, United States 
will be up to 4, indicating moderate risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
With a UV index reaching up to 4 in San Antonio, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
Read more here about the climate and sun exposure in and around San Antonio.
The UV index in San Antonio can reach high levels, especially during summer. It is important to protect your skin from the sun's harmful rays by wearing sunscreen, sunglasses, and a hat. The UV index is a scale from 0 to 11+, with higher numbers indicating a higher risk of sunburn. In San Antonio, the UV index can often reach 8 or above during the peak of summer (June to August), which is considered very high and requires extra caution.
San Antonio experiences distinct weather seasons throughout the year. Spring (March to May) brings mild temperatures ranging from 15-28 °C (59-82 °F), with occasional rain showers. Summer (June to August) is hot and humid, with temperatures soaring above 30 °C (86 °F) and frequent thunderstorms. Fall (September to November) is pleasant, with temperatures ranging from 18-30 °C (64-86 °F), and it is typically drier. Winter (December to February) is mild, with temperatures ranging from 7-20 °C (45-68 °F) and occasional frost.
Compared to its region, San Antonio enjoys more sunshine throughout the year. It receives an average of 300 days of sunshine annually. This higher sun exposure can contribute to the high UV index levels experienced in the city. However, it is essential to note that the sun's intensity may vary depending on the time of year and the specific weather conditions. It is always a good practice to check the UV index forecast and take necessary precautions to protect yourself from harmful UV radiation.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in San Antonio. It's designed to provide you with a better understanding of the yearly weather and sun exposure.