Monticello, IL Weather Forecast
Local 7-day forecast
Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Monticello, IL in one place.
A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Sunny, with a high near 90. South southeast wind around 3 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Monticello, 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 14, 2026 9:19 PM CDT.
The active forecast window currently covers Jul 16 to Jul 21, 2026 for Monticello, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 16 to Jul 21, 2026
- Latest sync
- Jul 14, 2026 9:19 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Monticello
Thursday looks like the warmest upcoming period in Monticello at 90 degrees F.
Sunday Night is the coolest period ahead with temperatures near 70 degrees F.
The strongest winds are forecast for Tuesday at about 9 to 16 mph WNW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 9:19 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
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 before 7pm. Mostly clear, with a low around 72. South southwest wind around 3 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms between 7am and 1pm, then showers and thunderstorms. Mostly sunny, with a high near 88. West southwest wind 3 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Mostly cloudy, with a low around 71. Southwest wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 71.
Sunny, with a high near 88.
Mostly clear, with a low around 70.
A slight chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 88.
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 70.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Jul 16
|
Sunny then Chance Showers And Thunderstorms
|
90°F |
3 mph
SSE
|
|
Thursday Night
Jul 16
|
Chance Showers And Thunderstorms then Mostly Clear
|
72°F |
3 mph
SSW
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
88°F |
3 to 8 mph
WSW
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
71°F |
5 to 8 mph
SW
|
|
Saturday
Jul 18
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
89°F |
8 to 14 mph
WSW
|
|
Saturday Night
Jul 18
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
71°F |
8 to 12 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
88°F |
9 mph
WNW
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
70°F |
8 mph
SW
|
|
Monday
Jul 20
|
Slight Chance Showers And Thunderstorms
|
88°F |
8 to 14 mph
SW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
70°F |
8 to 12 mph
W
|
|
Tuesday
Jul 21
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
86°F |
9 to 16 mph
WNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Monticello.
