Grand Detour, IL Weather Forecast
Local 7-day forecast
Patchy Fog
Track current conditions, temperature changes, wind, and the full daily outlook for Grand Detour, IL in one place.
Patchy fog. Mostly clear, with a low around 27. Wind around 0 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: Nov 7, 2026 5:17 AM CST.
The active forecast window currently covers Nov 7 to Nov 13, 2026 for Grand Detour, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 7 to Nov 13, 2026
- Latest sync
- Nov 7, 2026 5:17 AM CST
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Grand Detour
Monday looks like the warmest upcoming period in Grand Detour at 61 degrees F.
Overnight is the coolest period ahead with temperatures near 27 degrees F.
The strongest winds are forecast for Saturday at about 0 to 10 mph WNW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Nov 7, 2026 5:17 AM CST
- 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
Patchy fog before 8am. Mostly sunny. High near 50, with temperatures falling to around 44 in the afternoon. West northwest wind 0 to 10 mph.
Patchy fog after 5am. Partly cloudy, with a low around 35. West southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Patchy fog before 9am. Mostly sunny, with a high near 59. West wind 5 to 10 mph, with gusts as high as 25 mph.
Mostly clear, with a low around 32. Northwest wind 0 to 5 mph, with gusts as high as 15 mph.
Mostly sunny, with a high near 61.
Mostly clear, with a low around 41.
Sunny, with a high near 61.
Partly cloudy, with a low around 36.
Mostly sunny, with a high near 55.
A slight chance of rain. Mostly cloudy, with a low around 35.
A slight chance of rain before noon. Partly sunny, with a high near 48.
Partly cloudy, with a low around 30.
Mostly sunny, with a high near 46.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Nov 7
|
Patchy Fog
|
27°F |
0 mph
|
|
Saturday
Nov 7
|
Patchy Fog then Mostly Sunny
|
50°F |
0 to 10 mph
WNW
|
|
Saturday Night
Nov 7
|
Partly Cloudy then Patchy Fog
|
35°F |
5 to 10 mph
WSW
|
|
Sunday
Nov 8
|
Patchy Fog then Mostly Sunny
|
59°F |
5 to 10 mph
W
|
|
Sunday Night
Nov 8
|
Mostly Clear
|
32°F |
0 to 5 mph
NW
|
|
Monday
Nov 9
|
Mostly Sunny
|
61°F |
0 to 10 mph
WNW
|
|
Monday Night
Nov 9
|
Mostly Clear
|
41°F |
0 to 5 mph
WSW
|
|
Tuesday
Nov 10
|
Sunny
|
61°F |
0 to 5 mph
WNW
|
|
Tuesday Night
Nov 10
|
Partly Cloudy
|
36°F |
0 mph
|
|
Veterans Day
Nov 11
|
Mostly Sunny
|
55°F |
0 to 5 mph
NNW
|
|
Wednesday Night
Nov 11
|
Slight Chance Rain
|
35°F |
0 to 5 mph
N
|
|
Thursday
Nov 12
|
Slight Chance Rain then Partly Sunny
|
48°F |
5 to 10 mph
N
|
|
Thursday Night
Nov 12
|
Partly Cloudy
|
30°F |
0 to 5 mph
N
|
|
Friday
Nov 13
|
Mostly Sunny
|
46°F |
5 to 10 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grand Detour.
