LaSalle County, IL: Current UV Index and Hourly Forecast

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As of 1:19 PM CDT on May 12, 2025, out of 30 cities in LaSalle County, IL in our database, 21 cities (70%) have a UV Index reading of Very High, 8 cities (27%) have a UV Index reading of High, while 1 city (3%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Mendota, IL with a reading of 8.2.

Over the next 24 hours, the highest UV Index reading in LaSalle County, IL is expected to be 8.2 in Mendota between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in LaSalle County, IL

• Cedar Point - 8.1
• Dana - 5.6
• Dayton - 8
• Earlville - 8.2
• Grand Ridge - 6.7
• Harding - 8
• Kangley - 6.7
• LaSalle - 7.8
• Lake Holiday - 8
• Leland - 8
• Leonore - 7.8
• Lostant - 7.8
• Marseilles - 6.7
• Mendota - 8.2
• Millington - 7.5
• Naplate - 7.8
• North Utica - 7.8
• Oglesby - 7.8
• Ottawa - 6.7
• Peru - 8.1
• Ransom - 6.7
• Rutland - 5.6
• Seneca - 5.9
• Serena - 8
• Sheridan - 8
• Streator - 5.4
• Tonica - 7.8
• Triumph - 8.2
• Troy Grove - 8.2
• Wedron - 8