| NWS Forecast for: Grundy County Issued by: National Weather Service Chicago, IL Last Update: 401 PM CDT Sat Sep 19 2026 | |
Late This Afternoon: Cloudy. A slight chance of showers and thunderstorms. Temperatures in the mid 70s. South winds around 5 mph. Chance of precipitation 20 percent. Tonight: A chance of showers and a slight chance of thunderstorms early in the evening, then showers and a chance of thunderstorms in the late evening and overnight. Humid. Lows in the upper 60s. East winds around 5 mph, becoming southwest after midnight. Chance of precipitation 90 percent. Sunday: A chance of thunderstorms early in the morning. Showers. A slight chance of thunderstorms in the late morning and afternoon. Humid with highs in the lower 70s. Northeast winds 5 to 10 mph, increasing to 10 to 15 mph with gusts up to 25 mph in the afternoon. Chance of precipitation 80 percent. Sunday Night: Mostly cloudy. A chance of showers early in the evening. A chance of showers after midnight. Lows in the upper 50s. Northeast winds 10 to 15 mph. Chance of precipitation 50 percent. Monday: Mostly cloudy. A chance of showers. Highs in the mid 60s. East winds 10 to 15 mph. Chance of precipitation 50 percent. Monday Night: Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 50s. Northeast winds 10 to 15 mph. Chance of precipitation 50 percent. Tuesday: Mostly cloudy. A chance of showers, mainly in the morning. Highs in the mid 60s. Chance of precipitation 50 percent. Tuesday Night: Mostly cloudy. Lows in the mid 50s. Wednesday: Mostly cloudy. Highs in the upper 60s. Wednesday Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 50s. Thursday: Mostly cloudy. Highs around 70. Thursday Night: Mostly cloudy. Lows in the mid 50s. Friday: Mostly cloudy. Highs in the lower 70s. Friday Night: Partly cloudy. Lows in the mid 50s. Saturday: Partly cloudy. Highs in the mid 70s. | |
| Zone Forecast: Grundy County | |
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