Mercer County, IL: Current UV Index and Hourly Forecast

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As of 10:56 AM CDT on August 23, 2026, all 15 cities in Mercer County, IL in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Aledo, IL with a reading of 3.7.

Over the next 24 hours, the highest UV Index reading in Mercer County, IL is expected to be 7.9 in Aledo between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in Mercer County, IL

• Aledo - 3.7
• Cable - 3.7
• Eliza - 3.7
• Hamlet - 3.7
• Joy - 3.7
• Keithsburg - 3.7
• Matherville - 3.7
• Millersburg - 3.7
• New Boston - 3.7
• North Henderson - 3.7
• Preemption - 3.7
• Seaton - 3.7
• Sherrard - 3.7
• Swedona - 3.7
• Viola - 3.7