UV Index
Chicago UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index5.8
- Avg Clouds23%
- Max Temp24.8 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in Chicago, United States 
will reach a high of 5.8 today. This means a moderate level of sun exposure. See our tips below to stay safe!
Last checked: 2025-09-10
Hourly Forecast Chart
Today's Safety Tips
The sun is a bit strong. Find some shade during midday. Wear a hat, sunglasses, and use SPF 30+ sunscreen if you'll be outside for a while.
Chicago's UV Index
Chicago's UV index varies widely throughout the year, often highest in summer months reaching 7 to 9, indicating strong sun exposure, and lowest in winter, sometimes near 0 or 1, meaning very weak UV rays. The city experiences four distinct seasons: cold, snowy winters; warm, humid summers; mild springs; and colorful, cool autumns. Snowfall is common in winter, and thunderstorms can happen in summer. Compared to other cities in the Midwest, Chicago tends to have colder winters because of its location near Lake Michigan, which also affects local weather. Neighboring states like Indiana and Wisconsin share similar weather patterns, but Chicago's lakefront can make its climate feel a bit different.
Hourly UV Index Trend
See the UV index hour by hour for Chicago. When the level is high, it's smart to find some shade.
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