Knox, IL Weather Forecast
Local 7-day forecast
Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Knox, IL in one place.
A slight chance of showers and thunderstorms. Mostly clear, with a low around 72. West southwest wind around 1 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Knox, 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 17, 2026 7:59 AM CDT.
The active forecast window currently covers Jul 17 to Jul 23, 2026 for Knox, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 7:59 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Knox
Saturday looks like the warmest upcoming period in Knox at 91 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Tuesday at about 8 to 15 mph WNW.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 7:59 AM 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
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. West southwest wind 2 to 8 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms before 11pm. Mostly clear, with a low around 72. Southwest wind 5 to 8 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
A slight chance of showers and thunderstorms after 4pm. Sunny, with a high near 91. Heat index values as high as 103. West wind 8 to 12 mph, with gusts as high as 20 mph.
A chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 67. North northeast wind 3 to 9 mph. Chance of precipitation is 30%.
Sunny, with a high near 87. East wind around 6 mph.
Mostly clear, with a low around 67. Southeast wind around 5 mph.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 87.
Mostly clear, with a low around 63.
Sunny, with a high near 81.
Mostly clear, with a low around 60.
Sunny, with a high near 81.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 17
|
Slight Chance Showers And Thunderstorms
|
72°F |
1 mph
WSW
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
90°F |
2 to 8 mph
WSW
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms then Mostly Clear
|
72°F |
5 to 8 mph
SW
|
|
Saturday
Jul 18
|
Sunny then Slight Chance Showers And Thunderstorms
|
91°F |
8 to 12 mph
W
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms then Mostly Clear
|
67°F |
3 to 9 mph
NNE
|
|
Sunday
Jul 19
|
Sunny
|
87°F |
6 mph
E
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
67°F |
5 mph
SE
|
|
Monday
Jul 20
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
91°F |
6 to 10 mph
S
|
|
Monday Night
Jul 20
|
Chance Showers And Thunderstorms
|
73°F |
9 mph
SW
|
|
Tuesday
Jul 21
|
Slight Chance Showers And Thunderstorms then Sunny
|
87°F |
8 to 15 mph
WNW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
63°F |
6 to 14 mph
N
|
|
Wednesday
Jul 22
|
Sunny
|
81°F |
5 to 8 mph
NNE
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
60°F |
1 to 7 mph
ENE
|
|
Thursday
Jul 23
|
Sunny
|
81°F |
5 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Knox.
