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Grundy County
 Details for Grundy County Severe Thunderstorm Watch

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Severe Thunderstorm Watch SEVERE THUNDERSTORM WATCH - Grundy County

NWS North Mississippi Valley Regional Radar WU North Central Satellite
Radar/Satellite images courtesy of NOAA/NWS and Weather Underground.
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Updated: @ 21-Aug-2026 4:10pm - next update at 6:00pm  
Summary / Temperature Wind Rain Outlook
overcast - Lightning observed overcast - Lightning observed
Currently: 82.2, Max: 82.8, Min: 58.9 82.2°F
Warmer 0.3°F than last hour.

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Feels like: 86°F

24-hr difference
-1.6°FColder 1.6°F than yesterday at this time.
  Today Yesterday
High: 82.8°F
3:30pm 		84.5°F
4:25pm
Low: 58.9°F
6:21am 		62.8°F
11:59pm
Calm S
0.0
Gust:
 0.0 mph
0 Bft - Calm
Today: 0.0 mph 5:46pm
Gust Month: 50.9 mph August 11
Rain Today: 0.00 in
Rain Rate (/hr): 0.000 in
Rain Yesterday: 0.00 in
Storm Rain: 0.00 in
This Month: 9.05 in
Season Total: 39.41 in
8 rain days in August.
Tonight

Tonight: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Humidity & Barometer Almanac Moon
Humidity: 68 % Increased 5.0% since last hour.
Dew Point: 70.6°F Increased 2.4°F since last hour.
Barometer: 29.938 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
   1.7     Low 
High: 4.6 @ 12:42pm
587 W/m2 (94 %)
High: 998 @  1:31pm
 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 around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
 
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.