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UV Index in San Antonio

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Today's UV index in San Antonio, United States United States will be up to 10.2, 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.


Today's tips

With a UV index of 10.2 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

San Antonio's UV index is typically high, with an average annual value of 9.4, indicating a very high risk of harm from unprotected sun exposure. The city's subtropical climate means intense sunlight is prevalent throughout the year.

Weather Seasons

UV index

San Antonio has a distinct seasonal pattern, with mild winters (December to February), hot summers (June to August), and a brief spring and autumn. Temperatures often soar above 100°F (38°C) during the summer months, while winters rarely dip below freezing.

San Antonio's Climate

Compared to neighboring cities and countries, San Antonio's climate is relatively hot and humid. It's drier than neighboring Houston, but more humid than cities in the Southwest. Mexico's climate is similar, with a mix of desert and subtropical regions, while the Gulf Coast region is generally more humid and prone to hurricanes.

Annual Sun Radiation

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.


* 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.