Upper Alton, IL Weather

Madison County3:51 PM CDT38.91°N, 90.15°WElevation 545 ft

Current conditions

Clear
73°
Clear
Feels like 72°
High 72°·Low 47°
WindSSE 5 mph
Humidity36%
Dew point45°
Pressure30.29 inHg
Visibility10 mi
Cloud cover1%
UV index3 Moderate
Sunrise7:16 AM
Sunset6:16 PM

Observed at St. Charles, St. Charles County Smartt Airport · 1 hr ago

Forecast

10-day

  • Today

    Sunny, with a high near 72. Southeast wind around 5 mph.

  • Tonight

    Mostly clear, with a low around 47. Southeast wind 0 to 5 mph.

  • Wednesday

    Sunny, with a high near 73. Southeast wind 0 to 3 mph.

National Weather Service forecast updated 7 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 71°
  2. 4 PM Sunny 71°
  3. 5 PM Sunny 70°
  4. 6 PM Clear 67°
  5. 7 PM Clear 61°
  6. 8 PM Clear 58°
  7. 9 PM Clear 56°
  8. 10 PM Mostly Clear 55°
  9. 11 PM Clear 53°
  10. Wed12 AM Mostly Clear 52°
  11. 1 AM Mostly Clear 51°
  12. 2 AM Mostly Clear 50°
  13. 3 AM Mostly Clear 50°
  14. 4 AM Mostly Clear 48°
  15. 5 AM Mostly Clear 48°
  16. 6 AM Sunny 48°
  17. 7 AM Mostly Sunny 47°
  18. 8 AM Sunny 48°
  19. 9 AM Mostly Sunny 53°
  20. 10 AM Mostly Sunny 60°
  21. 11 AM Sunny 64°
  22. 12 PM Sunny 68°
  23. 1 PM Sunny 71°
  24. 2 PM Sunny 72°

10-day forecast

Details
  1. TodayOct 20 Sunny Sunny47°72°
  2. WedOct 21 Sunny Sunny46°73°
  3. ThuOct 22 Sunny Sunny48°76°
  4. FriOct 23 Sunny Sunny48°75°
  5. SatOct 24 Mostly Sunny Mostly Sunny52°75°
  6. SunOct 25 Partly Sunny Partly Sunny51°77°
  7. MonOct 26 Partly Sunny Partly Sunny48°73°
  8. TueOct 27 Partly cloudy Partly cloudy56°67°
  9. WedOct 28 Cloudy Cloudy0.02 in50°62°
  10. ThuOct 29 Cloudy Cloudy51°59°

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

Radar

Full map
Open the National Weather Service radar (the map here needs JavaScript).

Weather news near Upper Alton

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Air quality

43
Good
Ozone

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

Forecast

  • TueModerate
  • WedModerate
  • ThuModerate

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 7:16 AM
Sunset 6:16 PM
Daylight 11 h 0 min (−2 min 23 s tomorrow)
Waxing Gibbous · 71% lit
Moonrise 3:27 PM Moonset 1:19 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low68° / 48°
Record high88° (2003)
Record low26° (1930)
Wettest2.08 in (1983)
Yesterday70° / 43°
Month to date1.76 in (normal 1.83 in)

St Louis Area, records since 1874. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LSX, issued 9 hrs ago

Key Messages

- Dry and seasonably warm conditions will persist through the end of the week.

Short Term

Issued at 227 AM CDT Tue Oct 20 2026

The forecast for the next several days can be summed up in one phrase - status quo. With an omega block in place in the mid-levels and high pressure stationed over the eastern CONUS at the surface, there is no reason for our sensible weather to change. The small increases in temperature we expect over the week can be attributed to persistent insolation rather than any sort of advection or dynamical reasoning. High clouds blowing into the region from the southern Plains may enter Mid-Missouri slightly before peak heating, which would prevent that area from gaining that degree or two of warmth this afternoon - a negligible difference on human skin. In all, the forecast today calls for highs around 70 degrees with very little wind and plenty of sun. Add a degree and we have the forecast for Wednesday as well. The high clouds and warmer afternoon will support higher low temperatures tonight for our Missouri counties. To the east where skies will be clearer for longer, radiational cooling is expected to create similar conditions to this morning.

Long Term

Issued at 227 AM CDT Tue Oct 20 2026

The forecast from Wednesday night through the end of the week is the same as that of today and tomorrow. Widespread 70s increase a degree or two each day unless warming is perturbed by high clouds. Late in the week mid-level ridging will be shoved eastward and flattened as a longwave trough strengthens over the Four Corners region. This system is forecast to drive a cold front into the Midwest late Saturday into Sunday, but latest model guidance indicates the front will pivot into a more west-east orientation before it reaches Missouri/central Illinois. This would keep accompanying rain and cold air to our north and lengthen the duration of our warm streak. Ensembles, aside from the GEFS, appear to support this solution. 850 mb temperatures Sunday into Monday are still forecast to be about 10C - the same as today - so a drastic cooldown within that period is not likely if the models are correct. Beyond that guidance diverges, and that's reliant on if the cold front does push through the CWA or not Monday into Tuesday. The NBM high temperature IQRs reflect the uncertainty quite well, with KSTL jumping from a 4 degree split on Sunday to a 12 degree split by Tuesday.

Aviation

Issued at 604 AM CDT Tue Oct 20 2026

After the morning river and valley fog dissipates, dry and VFR conditions with light winds will prevail through the remainder of the period.

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.