LaSalle County, IL: Current UV Index and Hourly Forecast

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As of 3:19 PM CDT on April 4, 2026, all 30 cities in LaSalle County, IL in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Peru, IL with a reading of 4.3.

Over the next 24 hours, the highest UV Index reading in LaSalle County, IL is expected to be 6.2 in Streator between 1:00 PM - 2:00 PM CDT tomorrow.

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Current UV Index in Cities in LaSalle County, IL

• Cedar Point - 4.3
• Dana - 3.9
• Dayton - 4
• Earlville - 4.3
• Grand Ridge - 3.8
• Harding - 4
• Kangley - 3.8
• LaSalle - 4
• Lake Holiday - 4
• Leland - 4
• Leonore - 4
• Lostant - 4
• Marseilles - 3.8
• Mendota - 4.3
• Millington - 3.3
• Naplate - 4
• North Utica - 4
• Oglesby - 4
• Ottawa - 3.8
• Peru - 4.3
• Ransom - 3.8
• Rutland - 3.9
• Seneca - 3
• Serena - 4
• Sheridan - 4
• Streator - 3.8
• Tonica - 4
• Triumph - 4.3
• Troy Grove - 4.3
• Wedron - 4