Sumner, IL Weather

Lawrence County3:31 AM CDT38.72°N, 87.86°WElevation 456 ft

Current conditions

Clear
45°
Clear
Feels like 45°
High 73°·Low 43° tonight
WindCalm
Humidity97%
Dew point44°
Pressure30.27 inHg
Visibility10.0 mi
Cloud cover2%
UV index0 Low
Sunrise7:07 AM
Sunset6:06 PM

Observed at Mount Carmel, Mount Carmel Municipal Airport · 56 min ago

Forecast

10-day

  • Overnight

    Clear, with a low around 43. Wind around 0 mph.

  • Wednesday

    Patchy fog before 8am. Sunny, with a high near 73. North wind around 1 mph.

  • Wednesday Night

    Mostly clear, with a low around 46. North wind around 1 mph.

National Weather Service forecast updated 1 hr ago.

Hourly

Hourly forecast
  1. Now Clear 44°
  2. 4 AM Clear 43°
  3. 5 AM Clear 43°
  4. 6 AM Patchy Fog 43°
  5. 7 AM Patchy Fog 43°
  6. 8 AM Sunny 46°
  7. 9 AM Sunny 54°
  8. 10 AM Sunny 60°
  9. 11 AM Sunny 65°
  10. 12 PM Sunny 69°
  11. 1 PM Sunny 71°
  12. 2 PM Sunny 73°
  13. 3 PM Sunny 73°
  14. 4 PM Sunny 73°
  15. 5 PM Sunny 72°
  16. 6 PM Mostly Clear 68°
  17. 7 PM Clear 62°
  18. 8 PM Clear 58°
  19. 9 PM Mostly Clear 56°
  20. 10 PM Mostly Clear 54°
  21. 11 PM Mostly Clear 53°
  22. Thu12 AM Clear 52°
  23. 1 AM Clear 50°
  24. 2 AM Clear 49°

10-day forecast

Details
  1. TonightOct 20 Clear Clear43°
  2. TodayOct 21 Patchy Fog then Sunny Patchy Fog then Sunny46°73°
  3. ThuOct 22 Sunny Sunny45°74°
  4. FriOct 23 Sunny Sunny45°72°
  5. SatOct 24 Sunny Sunny47°74°
  6. SunOct 25 Mostly Sunny Mostly Sunny48°77°
  7. MonOct 26 Mostly Sunny Mostly Sunny49°75°
  8. TueOct 27 Partly Sunny Partly Sunny69°
  9. WedOct 28 Cloudy Cloudy44°60°
  10. ThuOct 29 Sunny Sunny38°58°

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 Sumner

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Air quality

8
Good
Ozone

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

Vincennes, IN reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:07 AM
Sunset 6:06 PM
Daylight 10 h 58 min (−2 min 23 s tomorrow)
Waxing Gibbous · 75% lit
Moonrise 3:42 PM Moonset 2:13 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low66° / 42°
Record high86° (1908)
Record low28° (2022)
Wettest0.87 in (2016)
Month to date0.70 in (normal 2.39 in)

Robinson, records since 1895. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in ILX, issued 2 hrs ago

Key Messages

- Dry conditions and tranquil weather prevail across central and southeast Illinois through this weekend.

- Above normal temperatures will dominate the region, with afternoon highs climbing into the mid to upper 70s.

Discussion

Issued at 1233 PM CDT Tue Oct 20 2026

Expansive surface high pressure centered south of James Bay extends southwest into the mid and lower Mississippi Valley this afternoon. Broad subsidence and very dry air below 500 mb will lead to clear skies through tonight. High temperatures to peak in the lower 70s today, followed by overnight lows in the mid 40s.

A moderating trend begins Wednesday and continues through this weekend as upper level ridging amplifies overhead. Suite of model guidance indicates 850 hPa temperatures warming to +11C to +13C through this period. Afternoon mix-down of this air will lead to daily highs in the mid 70s through Friday, then upper 70s to around 80F this weekend when southwest low level flow becomes better established. Forecast soundings show daytime boundary layer mixing reducing afternoon dewpoints into the 40s, yielding minimum relative humidity values between 30 and 40 percent. Normally in late October this would result in an enhanced risk of fire spread, but a weak MSLP gradient will promote light winds under 10 mph through Friday.

A transition in the upper air pattern begins Monday into Tuesday as a potent upper-level trough traverses the northern Plains and lifts toward the Upper Midwest. The ECMWF-AI and operational ECMWF-Ens have remained consistent with a slightly slower frontal passage than the GEFS members, bringing the attendant cold front into western Illinois Monday evening and clearing southeast Illinois Tuesday afternoon. The NBM introduces slight chance PoPs (15 percent) west of the Illinois River Monday afternoon. With a lack of upper level support and projected dry airmass, models generally show a dry frontal passage for the remainder of the CWA.

Aviation

Issued at 1239 AM CDT Wed Oct 21 2026

VFR conditions will prevail at all TAF sites next 24hrs with clear skies. Winds will remain light and variable.

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.