Sullivan, MO Weather

Franklin County1:56 PM CDT38.21°N, 91.16°WElevation 981 ft

Current conditions

Haze
70°
Haze
Feels like 70°
High 72°·Low 47°
WindCalm
Humidity43%
Dew point46°
Pressure30.34 inHg
Visibility5.0 mi
Cloud cover2%
UV index5 Moderate
Sunrise7:19 AM
Sunset6:21 PM

Observed at Washington Regional Airport · 1 hr ago

Forecast

10-day

  • This Afternoon

    Mostly sunny, with a high near 72. Southeast wind around 3 mph.

  • Tonight

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

  • Wednesday

    Sunny, with a high near 74. West wind around 3 mph.

National Weather Service forecast updated 2 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 70°
  2. 2 PM Sunny 71°
  3. 3 PM Mostly Sunny 72°
  4. 4 PM Mostly Sunny 72°
  5. 5 PM Partly Sunny 70°
  6. 6 PM Mostly Cloudy 66°
  7. 7 PM Mostly Cloudy 61°
  8. 8 PM Partly Cloudy 57°
  9. 9 PM Mostly Clear 56°
  10. 10 PM Mostly Clear 54°
  11. 11 PM Mostly Cloudy 54°
  12. Wed12 AM Mostly Cloudy 53°
  13. 1 AM Mostly Cloudy 52°
  14. 2 AM Mostly Cloudy 51°
  15. 3 AM Mostly Cloudy 51°
  16. 4 AM Partly Cloudy 50°
  17. 5 AM Partly Cloudy 50°
  18. 6 AM Mostly Sunny 49°
  19. 7 AM Mostly Sunny 48°
  20. 8 AM Sunny 50°
  21. 9 AM Mostly Sunny 56°
  22. 10 AM Mostly Sunny 62°
  23. 11 AM Sunny 66°
  24. 12 PM Sunny 69°

10-day forecast

Details
  1. TodayOct 20 Mostly Sunny Mostly Sunny47°72°
  2. WedOct 21 Sunny Sunny48°74°
  3. ThuOct 22 Sunny Sunny47°76°
  4. FriOct 23 Sunny Sunny48°74°
  5. SatOct 24 Mostly Sunny Mostly Sunny52°76°
  6. SunOct 25 Partly Sunny Partly Sunny51°76°
  7. MonOct 26 Partly Sunny Partly Sunny48°73°
  8. TueOct 27 Cloudy Cloudy0.02 in55°70°
  9. WedOct 28 Light rain Light rain0.03 in52°67°
  10. ThuOct 29 Cloudy Cloudy50°61°

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

Radar

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Weather news near Sullivan

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Air quality

64
Moderate
Fine particles (PM2.5)

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

Saint Louis, MO reporting area · 56 min ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:19 AM
Sunset 6:21 PM
Daylight 11 h 2 min (−2 min 21 s tomorrow)
Waxing Gibbous · 70% lit
Moonrise 3:30 PM Moonset 1:25 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Record high84° (1947)
Record low38° (2024)
Wettest0.77 in (1949)
Yesterday68° / 36°
Month to date1.50 in (normal 0.00 in)

Cuba, records since 1946. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LSX, issued 7 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.