Grand Pass, IL Weather Forecast
Local 7-day forecast
Isolated Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Grand Pass, IL in one place.
Isolated showers and thunderstorms. Sunny, with a high near 98. Heat index values as high as 106. West wind around 6 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Grand Pass, 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 5:16 PM CDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Grand Pass, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 5:16 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Grand Pass
This Afternoon looks like the warmest upcoming period in Grand Pass at 98 degrees F.
Monday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Saturday at about 5 to 8 mph SW.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 5:16 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
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. Mostly cloudy, with a low around 71. Heat index values as high as 104. North wind around 2 mph. Chance of precipitation is 70%.
Showers and thunderstorms before 10am, then scattered showers and thunderstorms. Partly sunny, with a high near 89. East wind around 2 mph. Chance of precipitation is 80%.
Isolated showers and thunderstorms before midnight. Mostly clear, with a low around 72. South wind around 2 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 94. West wind around 3 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 93. Chance of precipitation is 20%.
Mostly clear, with a low around 71.
Mostly sunny, with a high near 94.
A slight chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.
A chance of rain showers before 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 40%.
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Sep 15
|
Isolated Showers And Thunderstorms
|
98°F |
6 mph
W
|
|
Tonight
Sep 15
|
Chance Showers And Thunderstorms
|
71°F |
2 mph
N
|
|
Wednesday
Sep 16
|
Showers And Thunderstorms then Scattered Showers And Thunderstorms
|
89°F |
2 mph
E
|
|
Wednesday Night
Sep 16
|
Isolated Showers And Thunderstorms then Mostly Clear
|
72°F |
2 mph
S
|
|
Thursday
Sep 17
|
Slight Chance Showers And Thunderstorms
|
94°F |
3 mph
W
|
|
Thursday Night
Sep 17
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
70°F |
2 mph
NE
|
|
Friday
Sep 18
|
Slight Chance Showers And Thunderstorms then Sunny
|
93°F |
5 mph
SE
|
|
Friday Night
Sep 18
|
Mostly Clear
|
71°F |
5 mph
S
|
|
Saturday
Sep 19
|
Mostly Sunny
|
94°F |
5 to 8 mph
SW
|
|
Saturday Night
Sep 19
|
Slight Chance Showers And Thunderstorms
|
69°F |
3 mph
W
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
87°F |
2 to 6 mph
NW
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
64°F |
2 to 6 mph
N
|
|
Monday
Sep 21
|
Chance Rain Showers
|
79°F |
3 to 7 mph
NW
|
|
Monday Night
Sep 21
|
Mostly Cloudy then Slight Chance Rain Showers
|
59°F |
6 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grand Pass.