UV Index
UV Index
Today's UV index in McKinney, United States 
will be up to 9.1, 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: 2025-05-10
With a UV index of 9.1 in McKinney, 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.
McKinney, United States generally experiences a UV index ranging from moderate to high, especially during late spring and summer months, typically between 5 and 9.
Seasonal patterns in McKinney include hot, humid summers with temperatures often in the 90s °F (30s °C), mild winters with occasional cold snaps, and spring and fall bring moderate temperatures and some rainfall.
Compared to the wider Texas region, McKinney has slightly cooler winters due to its northern location. Neighboring states like Oklahoma have more extreme winter weather, while southern states like Louisiana experience higher humidity and warmer winters year-round.
See the UV index hour by hour for McKinney, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.