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UV Index in San Antonio, US

UV index


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Today's UV index in San Antonio, United States 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.


Today's tips

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.

San Antonio Weather

Read more here about the climate and sun exposure in and around San Antonio.

UV Index in 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.

Weather Seasons

UV index

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.

San Antonio's Climate

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.

Annual Sun 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.


* This page's content about the UV index in San Antonio (United States) is for educational and informational purposes only. The developers and data providers are not liable for the accuracy, reliability, or availability of the information. The information is not a substitute for professional medical advice, and the developers and data providers are not medical professionals. Seek advice from a qualified health provider for any medical concerns, and do not disregard medical advice or delay seeking it based on the information provided on this site.