UV Index
UV Index
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Today's UV index in McKinney, United States 
will be up to 5, indicating a moderate 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.
With a UV index reaching up to 5 in McKinney, 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.
McKinney, Texas experiences a humid subtropical climate, with an average UV index ranging from 4.6 in winter to 9.6 in summer, indicating moderate to very high levels of ultraviolet radiation throughout the year.
The city has four distinct seasons, with hot summers and mild winters. Summer temperatures often reach the mid-90s (Fahrenheit), while winters rarely drop below freezing. Spring and autumn are generally mild and pleasant.
Compared to its regional neighbors, McKinney's climate is similar to other southern Great Plains cities, such as Oklahoma City and Fort Worth. However, it is slightly drier than its eastern neighboring states, like Louisiana and Arkansas, and has a more extreme temperature range than its neighboring country, Mexico.