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UV Index in St. Louis, US

UV index


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Today's UV index in St. Louis, United States United States will be up to 2.1, indicating low 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

Today, the UV index suggests low sun danger (0-2) in St. Louis, reaching up to 2.1. Remember sunglasses and SPF 30+ on sunny days, and be cautious around reflective surfaces like sand, water, and snow for increased UV exposure.

St. Louis Weather

Read more here about the climate and sun exposure in and around St. Louis.

UV Index in St. Louis

The UV index in St. Louis can reach high levels during the summer months. It is important to protect your skin from the sun's harmful rays by wearing sunscreen, sunglasses, and hats. The UV index ranges from 2 (low) to 11+ (extreme), so be sure to take precautions especially during midday when the sun is strongest.

Weather Seasons

UV index

St. Louis experiences four distinct seasons throughout the year. Spring brings mild temperatures with highs around 15-24 °C (59-75 °F) and occasional showers. Summers are hot and humid, with temperatures often exceeding 32 °C (90 °F) and thunderstorms being common. Fall is pleasant with temperatures ranging from 10-21 °C (50-70 °F) and beautiful foliage. Winters in St. Louis can be cold, with temperatures typically ranging from -3 to 7 °C (26-45 °F) and occasional snowfall.

St. Louis's Climate

Compared to its region, St. Louis has a moderate climate with ample sunlight throughout the year. The city sees around 200 sunny days annually, providing plenty of opportunities for outdoor activities. However, it is important to be cautious due to the risk of sunburn and heat-related illnesses, especially during the hot summer months. It's always a good idea to stay hydrated, seek shade when necessary, and check the UV index for sun protection.

Annual Sun Radiation

The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in St. Louis. 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 St. Louis (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.