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Grundy Co
 Details for Grundy Co Severe Thunderstorm Watch
Severe Thunderstorm Watch SEVERE THUNDERSTORM WATCH - Grundy Co

NWS Central Great Lakes Regional Radar WU Central Satellite
Radar/Satellite images courtesy of NOAA/NWS and Weather Underground.
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Updated: @ 21-Aug-2026 4:35pm - next update at 4:40pm  
Summary / Temperature Wind Rain Outlook
Sunny, Dry Sunny, Dry
Currently: 82.3°F, Max: 84.9°F, Min: 61.8°F 82.3°F
Colder 0.2°F than last hour.

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Feels like: 86°F

24-hr difference
1.9°FWarmer 1.9°F than yesterday at this time.
  Today Yesterday
High: 84.9°F
3:16pm 		82.9°F
2:27pm
Low: 61.8°F
7:00am 		60.7°F
4:17am
Wind from SSW SSW
3.5
Gust:
 1 mph
1 Bft - Light Breeze
Today: 7 mph 3:22pm
Gust Month: 23.0 mph August 10
Rain Today: 0 in
Rain Rate (/hr): 0 in
Rain Yesterday: 0 in
Storm Rain: 0 in
This Month: 5.625 in
Season Total: 35.545 in
11 rain days in August.
Tonight

Tonight: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Humidity & Barometer Almanac Moon
Humidity: 65 %  
Dew Point: 69.4°F Decreased 0.2°F since last hour.
Barometer: 29.928 inHg Falling 0.03 inHg/hr
Baro Trend: Falling slowly
Sunrise: 6:08am
Sunset: 7:44pm
Moonrise: 3:51pm
Moonset: 11:33pm
Waxing Gibbous
Waxing Gibbous, Moon at 8 days in cycle
67%
Illuminated
UV Index Solar Radiation
   2.7     Low 
High: 6.6 @ 1:11pm
503 W/m2 (100 %)
High: 1060 @  1:12pm
 NWS Weather Forecast  - Outlook: This Afternoon & Tonight
This
Afternoon
This Afternoon: Chance Showers And Thunderstorms
Chance Showers And T-Storms

Hi 81 °F		 NWS forecast: A chance of showers and thunderstorms after 4pm. Some of the storms could be severe. Partly sunny. High near 81, with temperatures falling to around 79 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
Davis VP+ forecast: Increasing clouds with little temp change, precipitation possible and windy within 6 hrs.
 
Tonight

Tonight: Showers And Thunderstorms Likely
Showers And T-Storms Likely

Lo 63 °F		 NWS forecast: Showers and thunderstorms likely before 1am. Some of the storms could be severe. Mostly cloudy. Low around 63, with temperatures rising to around 65 overnight. West southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.