Green Brier, IL Weather Forecast
Local 7-day forecast
Slight Chance Rain Showers then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Green Brier, IL in one place.
A slight chance of rain showers before 11am. Mostly sunny, with a high near 94. Heat index values as high as 100. South wind 2 to 7 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Green Brier, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 15, 2026 5:17 PM CDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for Green Brier, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 5:17 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Green Brier
Thursday looks like the warmest upcoming period in Green Brier at 96 degrees F.
Monday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Sunday at about 6 to 12 mph W.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 5:17 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KVWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 73. South wind around 3 mph.
Mostly sunny, with a high near 96. West wind 3 to 8 mph.
Mostly clear, with a low around 71. Northeast wind around 5 mph.
Sunny, with a high near 93. East southeast wind around 7 mph.
Mostly clear, with a low around 70.
Mostly sunny, with a high near 96.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 71.
A slight chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 93.
A chance of showers and thunderstorms. Partly cloudy, with a low around 67.
A chance of showers and thunderstorms. Partly sunny, with a high near 85.
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 62.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Slight Chance Rain Showers then Mostly Sunny
|
94°F |
2 to 7 mph
S
|
|
Wednesday Night
Sep 16
|
Partly Cloudy
|
73°F |
3 mph
S
|
|
Thursday
Sep 17
|
Mostly Sunny
|
96°F |
3 to 8 mph
W
|
|
Thursday Night
Sep 17
|
Mostly Clear
|
71°F |
5 mph
NE
|
|
Friday
Sep 18
|
Sunny
|
93°F |
7 mph
ESE
|
|
Friday Night
Sep 18
|
Mostly Clear
|
70°F |
7 mph
SE
|
|
Saturday
Sep 19
|
Mostly Sunny
|
96°F |
6 to 10 mph
SSW
|
|
Saturday Night
Sep 19
|
Partly Cloudy then Slight Chance Rain Showers
|
71°F |
7 mph
SSW
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
93°F |
6 to 12 mph
W
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
67°F |
8 mph
ENE
|
|
Monday
Sep 21
|
Chance Showers And Thunderstorms
|
85°F |
6 to 10 mph
W
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms
|
62°F |
9 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Green Brier.