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Monticello, IL 61856 Weather
Current conditions
Observed at University of Illinois - Willard · 38 min ago
Forecast
10-day-
Tonight
Clear, with a low around 46. North wind around 1 mph.
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Thursday
Sunny, with a high near 75. North northeast wind 0 to 3 mph.
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Thursday Night
Mostly clear, with a low around 46. East wind around 5 mph.
National Weather Service forecast updated 9 hrs ago.
Hourly
Hourly forecast- Now49°
- 3 AM48°
- 4 AM47°
- 5 AM47°
- 6 AM46°
- 7 AM46°
- 8 AM48°
- 9 AM54°
- 10 AM62°
- 11 AM67°
- 12 PM70°
- 1 PM73°
- 2 PM74°
- 3 PM74°
- 4 PM75°
- 5 PM73°
- 6 PM70°
- 7 PM65°
- 8 PM59°
- 9 PM57°
- 10 PM55°
- 11 PM54°
- Fri12 AM52°
- 1 AM50°
10-day forecast
Details- WedOct 21Sunny46°74°
- TodayOct 22Sunny46°75°
- FriOct 23Sunny45°74°
- SatOct 24Mostly Sunny47°74°
- SunOct 25Partly Sunny48°77°
- MonOct 26Partly Sunny48°75°
- TueOct 27Partly Sunny45°69°
- WedOct 28Sunny41°55°
- ThuOct 29Partly cloudy36°63°
- FriOct 30Cloudy0.17 in48°64°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Monticello
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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- ThuModerate
- FriModerate
Champaign, IL reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyChampaign 3s, records since 1888. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
Forecasters' discussion
From the National Weather Service office in ILX, issued 14 hrs ago
Key Messages
- Sunny mild days and cool nights persist across central and southeast Illinois through Sunday, with highs in the mid- upper 70s and lows in the 40s.
- A cold front moves across the region early next week, bringing prospects for light rain, followed by cooler temperatures.
Discussion
Issued at 1211 PM CDT Wed Oct 21 2026
Surface ridge axis centered across the area provides quiet, clear conditions across central and southeast Illinois. Dry air and subsidence will continue to produce mainly clear skies and large diurnal temperature swings over the next several days.
Mid-level heights build across the Mississippi Valley Friday and this weekend as the surface high slips farther east. Models show strong consensus on establishing persistent southerly return flow. 850-hPa temperatures in the lower teens C, along with deeper mixing support afternoon highs around 80F on Sunday, around 15 degrees above climatological averages.
Medium-range deterministic solutions (ECMWF, ECMWF-AI, and GFS) and the ensemble suite diverge early next week regarding the progression of an upstream longwave trough and associated surface cold front. The deterministic GFS exhibits a faster frontal transit across central Illinois Monday evening with stronger pre-frontal 850-hPa flow (4050 kt). Conversely, the ECMWF and ECMWF-AI are roughly 6 to 12 hours slower, maintaining a broader frontal structure and tracking the primary boundary through the forecast area Tuesday. GEFS and ECMWF ensemble members favor this slower progression. Latest NBM run has lowered PoPs below mentionable levels, but this will likely change as the system develops. Behind the front, a shot of cooler air will move in, returning temperatures to more seasonable levels Tue-Wed.
Aviation
Issued at 1211 PM CDT Wed Oct 21 2026
Another cycle of VFR conditions and light/variable winds with high pressure in control.
Ilx Watches
None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.