Grundy County, IL Weather Forecast
County weather hub
Sunny
Compare major city weather across Grundy County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 93. Heat index values as high as 101. West northwest wind 0 to 5 mph.
County Weather Overview
This county weather page brings together forecast coverage for Grundy County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 3 of 3 mapped cities in Grundy County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 14 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 10:55 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Grundy County
Wednesday looks like the warmest upcoming period in Grundy County at 94 degrees F.
Monday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Saturday at about 5 to 10 mph WSW.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 10:55 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 72. Heat index values as high as 101. West southwest wind around 5 mph, with gusts as high as 10 mph.
Sunny, with a high near 94. Heat index values as high as 103. West wind around 5 mph.
Mostly clear, with a low around 73. Heat index values as high as 103. West southwest wind 0 to 5 mph.
Sunny, with a high near 93. West southwest wind 0 to 5 mph.
Mostly clear, with a low around 73.
Showers and thunderstorms likely after 7am. Mostly sunny, with a high near 91.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 73.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90.
A chance of showers and thunderstorms. Partly cloudy, with a low around 71.
A slight chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 88.
A slight chance of showers and thunderstorms after 7pm. Mostly clear, with a low around 68.
A slight chance of rain showers before 1pm. Sunny, with a high near 86.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Jul 14
|
Sunny
|
93°F |
0 to 5 mph
WNW
|
|
Tonight
Jul 14
|
Mostly Clear
|
72°F |
5 mph
WSW
|
|
Wednesday
Jul 15
|
Sunny
|
94°F |
5 mph
W
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
73°F |
0 to 5 mph
WSW
|
|
Thursday
Jul 16
|
Sunny
|
93°F |
0 to 5 mph
WSW
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
73°F |
0 to 5 mph
SSE
|
|
Friday
Jul 17
|
Showers And Thunderstorms Likely
|
91°F |
0 to 5 mph
SW
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
73°F |
5 mph
SW
|
|
Saturday
Jul 18
|
Mostly Sunny then Chance Showers And Thunderstorms
|
90°F |
5 to 10 mph
WSW
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
71°F |
5 to 10 mph
W
|
|
Sunday
Jul 19
|
Slight Chance Showers And Thunderstorms then Mostly Sunny
|
88°F |
5 to 10 mph
NNW
|
|
Sunday Night
Jul 19
|
Slight Chance Showers And Thunderstorms
|
68°F |
5 to 10 mph
SSE
|
|
Monday
Jul 20
|
Slight Chance Rain Showers
|
86°F |
5 to 10 mph
W
|
|
Monday Night
Jul 20
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
66°F |
5 mph
WSW
|
Major City Forecasts
Live forecast snapshots for major cities across Grundy County.
Coverage
Forecast coverage currently spans 3 of 3 mapped cities in Grundy County.
Largest mapped city population in this region: 15,162.
