Duncan, IL Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Duncan, IL in one place.
Mostly cloudy, with a high near 76. Southeast wind 1 to 7 mph.
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: Jul 23, 2026 6:32 PM CDT.
The active forecast window currently covers Jul 24 to Jul 29, 2026 for Duncan, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 24 to Jul 29, 2026
- Latest sync
- Jul 23, 2026 6:32 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Duncan
Monday looks like the warmest upcoming period in Duncan at 93 degrees F.
Friday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Monday at about 9 to 14 mph SW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 23, 2026 6:32 PM CDT
- Coverage
- 6 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
A chance of rain showers after 8pm. Mostly cloudy, with a low around 62. South wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
A slight chance of rain showers before 7am. Partly sunny, with a high near 84. South southwest wind around 6 mph. New rainfall amounts less than a tenth of an inch possible.
Mostly clear, with a low around 69. South southwest wind around 3 mph.
Mostly sunny, with a high near 91. Southwest wind 2 to 7 mph.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73.
A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.
Mostly clear, with a low around 72.
Mostly sunny, with a high near 90.
Partly cloudy, with a low around 68.
Sunny, with a high near 87.
Partly cloudy, with a low around 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 24
|
Mostly Cloudy
|
76°F |
1 to 7 mph
SE
|
|
Friday Night
Jul 24
|
Chance Rain Showers
|
62°F |
6 mph
S
|
|
Saturday
Jul 25
|
Slight Chance Rain Showers then Partly Sunny
|
84°F |
6 mph
SSW
|
|
Saturday Night
Jul 25
|
Mostly Clear
|
69°F |
3 mph
SSW
|
|
Sunday
Jul 26
|
Mostly Sunny
|
91°F |
2 to 7 mph
SW
|
|
Sunday Night
Jul 26
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
73°F |
5 to 9 mph
SSW
|
|
Monday
Jul 27
|
Slight Chance Showers And Thunderstorms
|
93°F |
9 to 14 mph
SW
|
|
Monday Night
Jul 27
|
Mostly Clear
|
72°F |
6 to 10 mph
NW
|
|
Tuesday
Jul 28
|
Mostly Sunny
|
90°F |
7 mph
N
|
|
Tuesday Night
Jul 28
|
Partly Cloudy
|
68°F |
5 mph
NE
|
|
Wednesday
Jul 29
|
Sunny
|
87°F |
2 to 6 mph
E
|
|
Wednesday Night
Jul 29
|
Partly Cloudy
|
66°F |
3 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Duncan.