UV Index
UV Index
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Today's UV index in Houston, United States 
will be up to 3.8, 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 3.8 in Houston, 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 Houston.
In Houston, the UV index can reach high levels throughout the year, especially in the summer months. The UV index is a measure of the intensity of the sun's ultraviolet radiation, and in Houston, it can regularly reach levels of 9 or 10 (very high) on a scale of 1 to 11+. This means that it is essential to protect your skin by wearing sunscreen, hats, and sunglasses, and seeking shade during peak sun hours.
Houston experiences a humid subtropical climate, with distinct seasons. Summers are hot and humid, with temperatures averaging around 32-35 °C (90-95 °F), and occasional afternoon thunderstorms. Fall and spring are pleasant with temperatures ranging from 16-27 °C (60-80 °F), while winters are generally mild with temperatures averaging around 9-18 °C (48-65 °F). However, it is not uncommon for Houston to experience fluctuations in weather, and sudden cold fronts, known as "Blue Northerns," can bring chilly temperatures for a few days.
Compared to other regions in the United States, Houston receives a significant amount of sun exposure. With about 204 sunny days in a year, Houston benefits from its southern location. While this can be enjoyable for outdoor activities, it also means that sun protection is crucial. It's important to be aware of the UV index and take measures to protect yourself from excessive sun exposure, as the risk of skin damage and sunburn is higher in areas with intense sunlight.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Houston. It's designed to provide you with a better understanding of the yearly weather and sun exposure.