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County Forecast for Grand Ridge , IL
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131000-
La Salle-
Including the cities of Ottawa, Streator, La Salle, Mendota,
and Marseilles
206 PM CDT Sat Sep 12 2026

Late this afternoon   Mostly cloudy. Temperatures in the mid 80s. West winds around 10 mph.
Tonight   Partly cloudy in the evening then clearing. Lows in the lower 60s. Northwest winds around 5 mph.
Sunday   Partly cloudy in the morning, then becoming mostly cloudy. A chance of showers in the afternoon. Highs in the mid 70s. North winds 5 to 10 mph. Chance of precipitation 40 percent.
Sunday night   Partly cloudy in the evening, then clearing. Lows in the lower 50s. North winds around 5 mph.
Monday   Partly cloudy in the morning, then becoming mostly cloudy. Highs in the mid 70s. East winds 5 to 10 mph, increasing to southeast 10 to 15 mph in the afternoon.
Monday night   Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Warmer with lows in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of precipitation 40 percent.
Tuesday   Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of precipitation 70 percent.
Tuesday night   Showers with a chance of thunderstorms. Lows in the mid 60s. Chance of precipitation 90 percent.
Wednesday   Showers likely, mainly in the morning. Highs in the lower 80s. Chance of precipitation 70 percent.
Wednesday night   Mostly cloudy. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 60s. Chance of precipitation 70 percent.
Thursday   Showers likely in the morning. Highs in the lower 80s. Chance of precipitation 70 percent.
Thursday night   Mostly cloudy. A chance of showers after midnight. Lows in the lower 60s. Chance of precipitation 40 percent.
Friday   Mostly cloudy. A chance of showers in the morning. Highs in the upper 70s. Chance of precipitation 40 percent.
Friday night   Mostly cloudy with a 40 percent chance of showers. Lows around 60.
Saturday   Mostly cloudy with a chance of showers in the morning, then partly cloudy in the afternoon. Highs in the mid 70s. Chance of precipitation 40 percent.
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Bryce Anderson image
Bryce Anderson – DTN Meteorologist
Front Pushing Through Midwest This Weekend
Posted at 12:14PM Fri Sep 11, 2026 CDT
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