Monticello, IL Weather

Piatt County1:20 PM CDT40.03°N, 88.57°WElevation 659 ft

Current conditions

Clear
72°
Clear
Feels like 70°
High 73°·Low 47°
WindSE 6 mph
Humidity41%
Dew point46°
Pressure30.39 inHg
Visibility10 mi
Cloud cover27%
UV index4 Moderate
Sunrise7:15 AM
Sunset6:03 PM

Observed at University of Illinois - Willard · 40 min ago

Forecast

10-day

  • Saturday

    Mostly sunny, with a high near 73. Southeast wind around 7 mph.

  • Saturday Night

    Partly cloudy, with a low around 47. Southeast wind around 6 mph.

  • Sunday

    Mostly sunny, with a high near 76. South wind around 5 mph.

National Weather Service forecast updated 1 day ago.

Hourly

Hourly forecast
  1. Now Mostly Sunny 71°
  2. 2 PM Mostly Sunny 72°
  3. 3 PM Mostly Sunny 73°
  4. 4 PM Mostly Sunny 73°
  5. 5 PM Mostly Sunny 72°
  6. 6 PM Partly Cloudy 69°
  7. 7 PM Partly Cloudy 64°
  8. 8 PM Partly Cloudy 59°
  9. 9 PM Partly Cloudy 57°
  10. 10 PM Mostly Clear 55°
  11. 11 PM Mostly Clear 54°
  12. Sun12 AM Mostly Clear 53°
  13. 1 AM Mostly Clear 52°
  14. 2 AM Mostly Clear 51°
  15. 3 AM Mostly Clear 49°
  16. 4 AM Mostly Clear 48°
  17. 5 AM Partly Cloudy 48°
  18. 6 AM Mostly Sunny 47°
  19. 7 AM Mostly Sunny 47°
  20. 8 AM Mostly Sunny 52°
  21. 9 AM Sunny 57°
  22. 10 AM Sunny 62°
  23. 11 AM Mostly Sunny 67°
  24. 12 PM Mostly Sunny 71°

10-day forecast

Details
  1. TonightOct 22 Clear Clear45°
  2. FriOct 23 Sunny Sunny46°74°
  3. TodayOct 24 Mostly Sunny Mostly Sunny47°73°
  4. SunOct 25 Mostly Sunny Mostly Sunny47°76°
  5. MonOct 26 Partly Sunny Partly Sunny49°75°
  6. TueOct 27 Partly Sunny Partly Sunny48°72°
  7. WedOct 28 Mostly Sunny Mostly Sunny49°73°
  8. ThuOct 29 Mostly Sunny Mostly Sunny13%73°
  9. FriOct 30 Partly cloudy Partly cloudy40°60°
  10. SatOct 31 Cloudy Cloudy44°62°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news near Monticello

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Air quality

50
Good
Fine particles (PM2.5)

Air quality is satisfactory, and air pollution poses little or no risk.

Forecast

  • SatModerate
  • SunModerate
  • MonModerate

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

Sunrise 7:15 AM
Sunset 6:03 PM
Daylight 10 h 48 min (−2 min 28 s tomorrow)
Waxing Gibbous · 97% lit
Moonrise 4:55 PM Moonset 5:30 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low62° / 41°
Record high80° (1991)
Record low19° (1981)
Wettest0.96 in (1918)
Yesterday76° / 47°
Month to date1.54 in (normal 2.47 in)

Champaign 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 1 hr ago

Key Messages

- Sunny, mild days and cool nights persist across central and southeast Illinois through the next week, with highs in the 70s and lows in the upper 40s to low 50s.

- Tranquil weather will continue for several more days, with the only meaningful chance of rain toward next weekend.

Discussion

Issued at 150 AM CDT Sat Oct 24 2026

The blocking pattern continues over the eastern half of the United States. A low pressure system is moving well off to the north of central IL, up in Canada, this weekend. The only change this has on our forecast is some increased high cloud cover at times. The main focus of this forecast continues to be the above normal temperatures and lack of rain.

Temperatures will continue to be above normal as we move into the next week. Highs will be in the low to upper 70s. Normals for this time of year is around 62-66 degrees across central and southeastern IL. The CPC's 6-10 day, 8-14 day, and Week 3-4 outlooks all show above normal temperatures. Dry weather will last through much of the extended period as well.

A weak shortwave passage on Wednesday morning may bring some light sprinkles to central IL but is looking more likely to pass without any activity due to how dry our airmass is. The next best chance for any rain has been pushed off into next weekend, just in time for Halloween. A stronger shortwave appears to pulse through late Friday into Saturday, bringing a 30-50% chance for showers. Amounts are forecast to be pretty minimal, but we are a week out still, so there is time for this forecast to change.

Aviation

Issued at 1219 PM CDT Sat Oct 24 2026

VFR conditions will prevail through the entire 18z TAF period. SCT-BKN mainly high clouds will stream across the sky, although a few passing clouds at around 12,000-15,000ft will be possible from time to time as well. Winds will be S/SE at less than 10kt.

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 4Search index and reflects what the press published. Terms of use.