Grand Detour, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grand Detour, IL in one place.
Sunny, with a high near 88. West wind around 5 mph, with gusts as high as 15 mph.
Local Weather Overview
This forecast page for Grand Detour, 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 9, 2026 6:37 PM CDT.
The active forecast window currently covers Jun 9 to Jun 15, 2026 for Grand Detour, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 9 to Jun 15, 2026
- Latest sync
- Jun 9, 2026 6:37 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Grand Detour
Wednesday looks like the warmest upcoming period in Grand Detour at 91 degrees F.
Monday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Wednesday at about 10 to 20 mph SSW.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 9, 2026 6:37 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- 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 showers and thunderstorms between 1am and 5am. Partly cloudy. Low around 69, with temperatures rising to around 72 overnight. South wind 0 to 5 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Heat index values as high as 100. South southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
Showers and thunderstorms likely before 4am. Mostly cloudy, with a low around 68. Southwest wind 5 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.
Showers and thunderstorms. Mostly cloudy, with a high near 87. South southwest wind 5 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.
Showers and thunderstorms before 1am. Partly cloudy, with a low around 58. Chance of precipitation is 90%.
Sunny, with a high near 76.
Clear, with a low around 58.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 84.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 60.
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 77.
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 54.
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 74.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 52.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Jun 9
|
Sunny
|
88°F |
5 mph
W
|
|
Tonight
Jun 9
|
Partly Cloudy then Chance Showers And Thunderstorms
|
69°F |
0 to 5 mph
S
|
|
Wednesday
Jun 10
|
Partly Sunny then Chance Showers And Thunderstorms
|
91°F |
10 to 20 mph
SSW
|
|
Wednesday Night
Jun 10
|
Showers And Thunderstorms Likely
|
68°F |
5 to 15 mph
SW
|
|
Thursday
Jun 11
|
Showers And Thunderstorms
|
87°F |
5 to 15 mph
SSW
|
|
Thursday Night
Jun 11
|
Showers And Thunderstorms
|
58°F |
5 to 15 mph
WSW
|
|
Friday
Jun 12
|
Sunny
|
76°F |
5 to 15 mph
W
|
|
Friday Night
Jun 12
|
Clear
|
58°F |
0 to 10 mph
WSW
|
|
Saturday
Jun 13
|
Sunny then Slight Chance Showers And Thunderstorms
|
84°F |
5 to 10 mph
SW
|
|
Saturday Night
Jun 13
|
Chance Showers And Thunderstorms
|
60°F |
5 to 10 mph
W
|
|
Sunday
Jun 14
|
Chance Showers And Thunderstorms
|
77°F |
5 to 10 mph
NNE
|
|
Sunday Night
Jun 14
|
Slight Chance Showers And Thunderstorms
|
54°F |
5 to 10 mph
NE
|
|
Monday
Jun 15
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
74°F |
5 to 10 mph
NW
|
|
Monday Night
Jun 15
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
52°F |
0 to 5 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grand Detour.
