Duncan, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely then Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Duncan, IL in one place.
Showers and thunderstorms likely before midnight. Mostly cloudy, with a low around 67. South southwest wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Duncan, 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: Jun 8, 2026 10:55 PM CDT.
The active forecast window currently covers Jun 8 to Jun 15, 2026 for Duncan, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 8 to Jun 15, 2026
- Latest sync
- Jun 8, 2026 10:55 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Duncan
Wednesday looks like the warmest upcoming period in Duncan at 91 degrees F.
Sunday Night is the coolest period ahead with temperatures near 58 degrees F.
The strongest winds are forecast for Thursday at about 9 to 22 mph SSW.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 8, 2026 10:55 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KDVN
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 89. West southwest wind 3 to 8 mph.
A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 72. South southwest wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 91. South southwest wind 10 to 21 mph, with gusts as high as 29 mph.
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Partly cloudy, with a low around 70. Southwest wind 9 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms. Mostly sunny, with a high near 89. South southwest wind 9 to 22 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and thunderstorms before 1am. Mostly cloudy, with a low around 61. West wind 6 to 20 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunny, with a high near 84.
Clear, with a low around 62.
A slight chance of showers and thunderstorms after 7am. Sunny, with a high near 87.
A chance of showers and thunderstorms. Partly cloudy, with a low around 61.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 81.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 58.
A slight chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 79.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tonight
Jun 8
|
Showers And Thunderstorms Likely then Mostly Cloudy
|
67°F |
6 mph
SSW
|
|
Tuesday
Jun 9
|
Partly Sunny
|
89°F |
3 to 8 mph
WSW
|
|
Tuesday Night
Jun 9
|
Chance Showers And Thunderstorms
|
72°F |
5 to 9 mph
SSW
|
|
Wednesday
Jun 10
|
Sunny then Slight Chance Showers And Thunderstorms
|
91°F |
10 to 21 mph
SSW
|
|
Wednesday Night
Jun 10
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms
|
70°F |
9 to 20 mph
SW
|
|
Thursday
Jun 11
|
Showers And Thunderstorms
|
89°F |
9 to 22 mph
SSW
|
|
Thursday Night
Jun 11
|
Showers And Thunderstorms
|
61°F |
6 to 20 mph
W
|
|
Friday
Jun 12
|
Sunny
|
84°F |
6 to 12 mph
W
|
|
Friday Night
Jun 12
|
Clear
|
62°F |
3 to 8 mph
WSW
|
|
Saturday
Jun 13
|
Slight Chance Showers And Thunderstorms
|
87°F |
6 to 12 mph
WSW
|
|
Saturday Night
Jun 13
|
Chance Showers And Thunderstorms
|
61°F |
6 to 9 mph
NW
|
|
Sunday
Jun 14
|
Chance Showers And Thunderstorms
|
81°F |
7 to 12 mph
NNW
|
|
Sunday Night
Jun 14
|
Slight Chance Showers And Thunderstorms
|
58°F |
5 to 10 mph
NNE
|
|
Monday
Jun 15
|
Chance Showers And Thunderstorms
|
79°F |
7 to 12 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Duncan.