Flat River, MO Weather

Saint Francois County5:18 AM CDT37.85°N, 90.52°WElevation 719 ft

Current conditions

Partly Cloudy
46°
Partly Cloudy
Feels like 46°
High 77°·Low 44° tonight
WindCalm
Humidity89%
Dew point43°
Visibility10 mi
Cloud cover32%
UV index0 Low
Sunrise7:17 AM
Sunset6:18 PM

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

Forecast

10-day

  • Overnight

    Partly cloudy, with a low around 44. South wind around 1 mph.

  • Wednesday

    Sunny, with a high near 77. Northeast wind around 2 mph.

  • Wednesday Night

    Mostly clear, with a low around 46. Northeast wind around 2 mph.

National Weather Service forecast updated 57 min ago.

Hourly

Hourly forecast
  1. Now Partly Cloudy 46°
  2. 6 AM Mostly Sunny 46°
  3. 7 AM Mostly Sunny 46°
  4. 8 AM Sunny 46°
  5. 9 AM Sunny 51°
  6. 10 AM Mostly Sunny 61°
  7. 11 AM Sunny 66°
  8. 12 PM Sunny 70°
  9. 1 PM Sunny 73°
  10. 2 PM Sunny 76°
  11. 3 PM Sunny 76°
  12. 4 PM Sunny 77°
  13. 5 PM Sunny 75°
  14. 6 PM Mostly Clear 72°
  15. 7 PM Mostly Clear 66°
  16. 8 PM Mostly Clear 59°
  17. 9 PM Mostly Clear 56°
  18. 10 PM Mostly Clear 54°
  19. 11 PM Clear 53°
  20. Thu12 AM Clear 51°
  21. 1 AM Mostly Clear 50°
  22. 2 AM Mostly Clear 49°
  23. 3 AM Mostly Clear 48°
  24. 4 AM Mostly Clear 48°

10-day forecast

Details
  1. TonightOct 20 Partly Cloudy Partly Cloudy44°
  2. TodayOct 21 Sunny Sunny46°77°
  3. ThuOct 22 Sunny Sunny45°77°
  4. FriOct 23 Sunny Sunny44°76°
  5. SatOct 24 Mostly Sunny Mostly Sunny48°78°
  6. SunOct 25 Mostly Sunny Mostly Sunny48°78°
  7. MonOct 26 Partly Sunny Partly Sunny48°76°
  8. TueOct 27 Slight Chance Rain Showers Slight Chance Rain Showers15%69°
  9. WedOct 28 Cloudy Cloudy0.16 in42°56°
  10. ThuOct 29 Sunny Sunny35°56°

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 in Missouri

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Air quality

11
Good
Ozone

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

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

Sun & moon

Sunrise 7:17 AM
Sunset 6:18 PM
Daylight 11 h 0 min (−2 min 18 s tomorrow)
Waxing Gibbous · 76% lit
Moonrise 3:52 PM Moonset 2:25 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low66° / 44°
Record high81° (1901)
Record low21° (1896)
Wettest1.94 in (1984)
Yesterday73° / 44°
Month to date0.98 in (normal 1.99 in)

Potosi 4 Sw, records since 1893. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

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

Key Messages

- Seasonably warm and dry weather will last through this weekend.

Short Term

Issued at 257 AM CDT Wed Oct 21 2026

No significant changes have been made to the forecast. The mid-level omega blocking pattern and surface high pressure influence will keep our sensible weather consistently dry, and insolation will act as the sole driver for our gradually warming temperatures. Expect highs generally in the mid-70s today and tomorrow with lows in the 40s to low-50s in between.

Long Term

Issued at 257 AM CDT Wed Oct 21 2026

The pattern begins to change late this week. A mid-level longwave trough circling over the Four Corners area is expected to split, with its poleward section phasing into another trough traversing western Canada. This shift will pull a cold front into the Upper Midwest Saturday and orient it zonally on Sunday as the shortwave zips into eastern Canada. The Mid-Mississippi Valley will remain well south of the cold front over the weekend, and our temperature trends will reflect that. LREF probabilities of 1pm temperatures >69 degrees Saturday and Sunday both range from 75-100%, and the NBM max temperature spread for each day is only 3 degrees. The cold front is expected to finally push into the region on Tuesday, but cooler weather is not guaranteed especially for locations south of I-70. Guidance suggests that the front may be weakening as it arrives, and that it may become stationary before it clears the area. This would mean that less cool air would filter into less of the CWA and that the warm streak may continue through Tuesday. Confidence in this, or for any solution, is still very low given the timeframe in question. Again, the NBM max temperature spread reflects this well as it climbs to 10+ degrees on Tuesday and nearly 20 degrees on Wednesday.

Aviation

Issued at 1000 PM CDT Tue Oct 20 2026

Mainly dry and VFR conditions are expected through the period with light winds.

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.