Lebanon, IL Weather

Saint Clair County8:32 AM CDT38.60°N, 89.81°WElevation 512 ft

Current conditions

Sunny
48°
Sunny
Feels like 48°
High 76°·Low 47°
WindE 2 mph
Humidity100%
Dew point48°
Visibility10 mi
Cloud cover25%
UV index0 Low
Sunrise7:18 AM
Sunset6:10 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Saturday

    Mostly sunny, with a high near 76. Southeast wind 1 to 5 mph.

  • Saturday Night

    Partly cloudy, with a low around 47. Southeast wind around 3 mph.

  • Sunday

    Partly sunny, with a high near 78. Southeast wind around 2 mph.

National Weather Service forecast updated 10 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 48°
  2. 9 AM Mostly Sunny 53°
  3. 10 AM Mostly Sunny 61°
  4. 11 AM Mostly Sunny 66°
  5. 12 PM Mostly Sunny 69°
  6. 1 PM Mostly Sunny 73°
  7. 2 PM Mostly Sunny 75°
  8. 3 PM Mostly Sunny 75°
  9. 4 PM Mostly Sunny 76°
  10. 5 PM Mostly Sunny 75°
  11. 6 PM Partly Cloudy 71°
  12. 7 PM Partly Cloudy 66°
  13. 8 PM Partly Cloudy 60°
  14. 9 PM Partly Cloudy 57°
  15. 10 PM Partly Cloudy 56°
  16. 11 PM Partly Cloudy 55°
  17. Sun12 AM Partly Cloudy 54°
  18. 1 AM Partly Cloudy 52°
  19. 2 AM Partly Cloudy 51°
  20. 3 AM Partly Cloudy 50°
  21. 4 AM Partly Cloudy 49°
  22. 5 AM Partly Cloudy 48°
  23. 6 AM Mostly Sunny 48°
  24. 7 AM Mostly Sunny 47°

10-day forecast

Details
  1. TonightOct 23 Mostly Clear Mostly Clear46°
  2. TodayOct 24 Mostly Sunny Mostly Sunny47°76°
  3. SunOct 25 Partly Sunny Partly Sunny50°78°
  4. MonOct 26 Partly Sunny Partly Sunny49°78°
  5. TueOct 27 Partly Sunny Partly Sunny50°77°
  6. WedOct 28 Mostly Sunny Mostly Sunny52°79°
  7. ThuOct 29 Mostly Sunny Mostly Sunny47°77°
  8. FriOct 30 Mostly Sunny Mostly Sunny73°
  9. SatOct 31 Cloudy Cloudy51°69°
  10. SunNov 1 Partly cloudy Partly cloudy0.11 in53°74°

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 Lebanon

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Air quality

70
Moderate
Fine particles (PM2.5)

Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Forecast

  • SatModerate
  • SunModerate
  • MonModerate

St. Louis (Metro-east), 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 7:18 AM
Sunset 6:10 PM
Daylight 10 h 52 min (−2 min 19 s tomorrow)
Waxing Gibbous · 97% lit
Moonrise 5:01 PM Moonset 5:34 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low69° / 44°
Month to date0.96 in (normal 2.18 in)

Belleville Siu Research, records since 1948. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LSX, issued 6 hrs ago

Key Messages

- A stagnant pattern remains in place keeping warm and dry conditions through the end of the week.

Short Term

Issued at 228 AM CDT Sat Oct 24 2026

A slow moving upper-level ridge remains over the central CONUS keeping dry and seasonably warm conditions in the Mid-Mississippi Valley through the weekend and into Monday. As a result, very little change in the weather day-to-day is expected. The only change is the presence of some upper-level clouds. The stubborn ridge continues to drive high temperatures into the mid to upper 70s, with some areas possibly exceeding 80 on Sunday depending on the thickness of the clouds. Dry air will allow for radiative cooling overnight keeping low temperatures in the upper 40s to low 50s, with the 40s predominately being in the river valleys and southeastern MO and southwestern IL. This is due to the presence of fewer clouds in that region, which will allow for more efficient radiative cooling overnight.

Long Term

Issued at 228 AM CDT Sat Oct 24 2026

Over the western CONUS, a deep upper-level trough is present and is expected to propagate to the northeast toward the north-central CONUS and into the Midwest during the middle of the week. Guidance is in good consensus that as the trough tracks northeast it will reduce the amplitude of the ridge over the region. The current forecasted track of the trough will cause the associated cold front to stay well to the north of the region, resulting in dry and seasonably warm conditions in the region continuing through the entire week. High temperatures will remain in the 70s each day.

Earlier guidance had indicated a potential pattern change at the end of the week, but latest model trends indicate stronger confidence that the ridge remains in place through the end of the week. Yesterday, the NBM and LREF guidances continued to hint at the possibility of a cold front coming at the end of the week with IQRs of 10-15 degrees for Thursday and Friday, but latest runs have IQRs of 5-10 degrees by raising the 25th percentile from being in the 60s to being in the low 70s. At the same time, this model trend has also decreased the chance of rain at the end of the week down to 10-30 percent on Friday while increasing the chances the following weekend ahead of the potential cold front.

Aviation

Issued at 1220 AM CDT Sat Oct 24 2026

High pressure continues to bring calm winds and VFR conditions. There continues to be a daily threat of fog in the valleys each morning, but thus far some high level cirrus clouds are providing enough of a blanket tonight to make this less likely than previous nights. However, if these clouds disperse then locally greater cooling may lead to local instances of fog through 12 or 13Z. The greatest chances are at SUS or CPS.

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.