Chesterfield, MO 63005 Weather

St. Louis County12:41 PM CDT38.63°N, 90.61°W

Current conditions

Clear
72°
Clear
Feels like 72°
High 75°·Low 48°
WindS 3 mph
Humidity47%
Dew point48°
Pressure30.27 inHg
Visibility10 mi
Cloud cover17%
UV index5 Moderate
Sunrise7:18 AM
Sunset6:17 PM

Observed at St. Louis, Spirit Of St. Louis Airport · 41 min ago

Forecast

10-day

  • Today

    Patchy fog before 8am. Mostly sunny, with a high near 75. Wind around 0 mph.

  • Tonight

    Mostly clear, with a low around 48. Wind around 0 mph.

  • Thursday

    Sunny, with a high near 76. Northeast wind around 1 mph.

National Weather Service forecast updated 7 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 69°
  2. 1 PM Sunny 73°
  3. 2 PM Sunny 73°
  4. 3 PM Mostly Sunny 74°
  5. 4 PM Sunny 75°
  6. 5 PM Sunny 73°
  7. 6 PM Mostly Clear 70°
  8. 7 PM Mostly Clear 66°
  9. 8 PM Mostly Clear 61°
  10. 9 PM Mostly Clear 59°
  11. 10 PM Mostly Clear 57°
  12. 11 PM Mostly Clear 55°
  13. Thu12 AM Mostly Clear 54°
  14. 1 AM Mostly Clear 53°
  15. 2 AM Mostly Clear 52°
  16. 3 AM Mostly Clear 51°
  17. 4 AM Mostly Clear 50°
  18. 5 AM Mostly Clear 50°
  19. 6 AM Sunny 49°
  20. 7 AM Sunny 48°
  21. 8 AM Sunny 50°
  22. 9 AM Sunny 55°
  23. 10 AM Sunny 63°
  24. 11 AM Sunny 68°

Daily forecast

Details
  1. TodayOct 21 Patchy Fog then Mostly Sunny Patchy Fog then Mostly Sunny48°75°
  2. ThuOct 22 Sunny Sunny48°76°
  3. FriOct 23 Sunny Sunny49°75°
  4. SatOct 24 Mostly Sunny Mostly Sunny51°76°
  5. SunOct 25 Partly Sunny Partly Sunny51°79°
  6. MonOct 26 Partly Sunny Partly Sunny51°75°
  7. TueOct 27 Slight Chance Rain Showers Slight Chance Rain Showers20%47°67°
  8. WedOct 28 Cloudy Cloudy0.05 in42°58°
  9. ThuOct 29 Sunny Sunny37°57°

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 Chesterfield

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Air quality

144
Unhealthy for Sensitive Groups
Fine particles (PM2.5)

People with heart or lung disease, older adults, children and teenagers should reduce prolonged or heavy exertion outdoors.

Saint Louis, 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 7:18 AM
Sunset 6:17 PM
Daylight 10 h 59 min (−2 min 22 s tomorrow)
Waxing Gibbous · 79% lit
Moonrise 3:53 PM Moonset 2:25 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low67° / 47°
Record high88° (1979)
Record low28° (1952)
Wettest0.76 in (1949)
Yesterday73° / 49°
Month to date1.76 in (normal 1.94 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 5 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

Fog will dissipate soon after sunrise. After that, dry and VFR conditions with very light south-southwesterly winds will prevail. There is a potential for river fog again tonight, but will add to TAFs when confidence in timing increases.

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.