Madison County, IL Weather Forecast
County weather hub
Showers And Thunderstorms Likely
Compare major city weather across Madison County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 84. South wind 9 to 13 mph. Chance of precipitation is 60%.
County Weather Overview
This county weather page brings together forecast coverage for Madison County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 17 of 17 mapped cities in Madison County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 16 to May 21, 2026
- Latest sync
- May 14, 2026 9:04 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Madison County
Sunday looks like the warmest upcoming period in Madison County at 89 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Monday at about 15 to 22 mph S.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- May 14, 2026 9:04 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 66. South wind around 9 mph. Chance of precipitation is 50%.
Sunny, with a high near 89.
Clear, with a low around 70.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 40%.
Showers and thunderstorms likely. Mostly sunny, with a high near 86. Chance of precipitation is 70%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 64. Chance of precipitation is 70%.
Showers and thunderstorms likely. Partly sunny, with a high near 79. Chance of precipitation is 70%.
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 40%.
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
May 16
|
Showers And Thunderstorms Likely
|
84°F |
9 to 13 mph
S
|
|
Saturday Night
May 16
|
Chance Showers And Thunderstorms
|
66°F |
9 mph
S
|
|
Sunday
May 17
|
Sunny
|
89°F |
9 to 20 mph
S
|
|
Sunday Night
May 17
|
Clear
|
70°F |
13 to 18 mph
S
|
|
Monday
May 18
|
Mostly Sunny then Chance Showers And Thunderstorms
|
89°F |
15 to 22 mph
S
|
|
Monday Night
May 18
|
Chance Showers And Thunderstorms
|
72°F |
15 to 20 mph
S
|
|
Tuesday
May 19
|
Showers And Thunderstorms Likely
|
86°F |
14 to 17 mph
SW
|
|
Tuesday Night
May 19
|
Showers And Thunderstorms Likely
|
64°F |
6 to 12 mph
SW
|
|
Wednesday
May 20
|
Showers And Thunderstorms Likely
|
79°F |
9 mph
S
|
|
Wednesday Night
May 20
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
59°F |
7 mph
E
|
|
Thursday
May 21
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
78°F |
9 mph
E
|
Major City Forecasts
Live forecast snapshots for major cities across Madison County.
Coverage
Forecast coverage currently spans 17 of 17 mapped cities in Madison County.
Largest mapped city population in this region: 29,251.
