Grundy County, IL Weather Forecast
County weather hub
Mostly Cloudy
Compare major city weather across Grundy County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly cloudy, with a low around 60. East wind around 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
- May 29 to Jun 5, 2026
- Latest sync
- May 30, 2026 1:54 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Grundy County
Thursday looks like the warmest upcoming period in Grundy County at 87 degrees F.
Saturday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Saturday at about 5 to 15 mph E.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- May 30, 2026 1:54 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
Partly sunny, with a high near 82. East wind 5 to 15 mph.
Mostly cloudy, with a low around 55. East wind 5 to 15 mph.
Partly sunny, with a high near 80. East southeast wind around 5 mph, with gusts as high as 15 mph.
Mostly cloudy, with a low around 58. East wind 0 to 5 mph.
Partly sunny, with a high near 83.
Partly cloudy, with a low around 56.
Sunny, with a high near 83.
Mostly clear, with a low around 55.
Sunny, with a high near 85.
Mostly clear, with a low around 60.
Mostly sunny, with a high near 87.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 66.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 87.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tonight
May 29
|
Mostly Cloudy
|
60°F |
5 mph
E
|
|
Saturday
May 30
|
Partly Sunny
|
82°F |
5 to 15 mph
E
|
|
Saturday Night
May 30
|
Mostly Cloudy
|
55°F |
5 to 15 mph
E
|
|
Sunday
May 31
|
Partly Sunny
|
80°F |
5 mph
ESE
|
|
Sunday Night
May 31
|
Mostly Cloudy
|
58°F |
0 to 5 mph
E
|
|
Monday
Jun 1
|
Partly Sunny
|
83°F |
0 to 5 mph
NE
|
|
Monday Night
Jun 1
|
Partly Cloudy
|
56°F |
5 to 10 mph
NE
|
|
Tuesday
Jun 2
|
Sunny
|
83°F |
5 to 10 mph
ENE
|
|
Tuesday Night
Jun 2
|
Mostly Clear
|
55°F |
0 to 10 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
85°F |
0 to 5 mph
SSE
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
60°F |
5 mph
S
|
|
Thursday
Jun 4
|
Mostly Sunny
|
87°F |
5 to 10 mph
SSW
|
|
Thursday Night
Jun 4
|
Partly Cloudy then Slight Chance Rain Showers
|
66°F |
5 to 10 mph
SSW
|
|
Friday
Jun 5
|
Chance Rain Showers then Chance Showers And Thunderstorms
|
87°F |
5 to 10 mph
SW
|
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.
