LaSalle County, IL: Current UV Index and Hourly Forecast

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As of 8:15 AM CST on January 23, 2026, all 30 cities in LaSalle County, IL in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Ottawa, IL with a reading of 0.2.

Over the next 24 hours, the highest UV Index reading in LaSalle County, IL is expected to be 1.8 in Ottawa between 12:00 PM - 1:00 PM CST today.

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Current UV Index in Cities in LaSalle County, IL

• Cedar Point - 0.2
• Dana - 0.2
• Dayton - 0.2
• Earlville - 0.2
• Grand Ridge - 0.2
• Harding - 0.2
• Kangley - 0.2
• LaSalle - 0.2
• Lake Holiday - 0.2
• Leland - 0.2
• Leonore - 0.2
• Lostant - 0.2
• Marseilles - 0.2
• Mendota - 0.2
• Millington - 0.2
• Naplate - 0.2
• North Utica - 0.2
• Oglesby - 0.2
• Ottawa - 0.2
• Peru - 0.2
• Ransom - 0.2
• Rutland - 0.2
• Seneca - 0.2
• Serena - 0.2
• Sheridan - 0.2
• Streator - 0.2
• Tonica - 0.2
• Triumph - 0.2
• Troy Grove - 0.2
• Wedron - 0.2