UV Index
UV Index
Today's UV index in Granite City, United States 
will be up to 10.2, indicating a very high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-20
With a UV index of 10.2 in Granite City, 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.
Granite City, United States, has a UV index that varies throughout the year, typically reaching higher levels in the summer months, often around 7 to 9, indicating strong sunlight during these periods.
Seasonal patterns include warm to hot summers with temperatures often in the 80s and 90s Fahrenheit, mild to cool springs and falls, and cold winters with temperatures often below freezing and occasional snowfall.
Compared to the wider Midwest region and neighboring states like Illinois and Missouri, Granite City's weather is fairly typical with its mix of hot summers and cold winters, though it may experience slightly more humidity due to its proximity to the Mississippi River.
See the UV index hour by hour for Granite City, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.