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Clayton, MO Weather
Current conditions
Observed at St. Louis Lambert International Airport · 32 min ago
Forecast
10-day-
Tuesday Night
Mostly clear, with a low around 50. Southeast wind 0 to 3 mph.
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Wednesday
Sunny, with a high near 73. Southeast wind 0 to 3 mph.
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Wednesday Night
Mostly clear, with a low around 49. Northeast wind around 1 mph.
National Weather Service forecast updated 18 hrs ago.
Hourly
Hourly forecast- Now57°
- 11 PM55°
- Wed12 AM54°
- 1 AM53°
- 2 AM53°
- 3 AM53°
- 4 AM51°
- 5 AM51°
- 6 AM50°
- 7 AM50°
- 8 AM51°
- 9 AM54°
- 10 AM60°
- 11 AM64°
- 12 PM68°
- 1 PM70°
- 2 PM72°
- 3 PM72°
- 4 PM73°
- 5 PM72°
- 6 PM68°
- 7 PM65°
- 8 PM61°
- 9 PM60°
10-day forecast
Details- TonightOct 19Mostly Clear49°
- TodayOct 20Sunny50°72°
- WedOct 21Sunny49°73°
- ThuOct 22Sunny50°75°
- FriOct 23Sunny51°75°
- SatOct 24Mostly Sunny54°76°
- SunOct 25Partly Sunny53°77°
- MonOct 26Partly Sunny74°
- TueOct 27Partly cloudy0.03 in51°60°
- WedOct 28Mostly sunny44°57°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Clayton
More weather news- St. Louis Weather Forecast Friday Through Thursday
St. Louis is trading late-summer warmth for a blustery fall reset Friday: mostly cloudy skies, a high near 55, and northwest winds around 17 mph with gusts up to 33 mph. A few rain showers could move through after 3…
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How frost this weekend could kickstart the emergence of fall foliageIf you have been waiting for vibrant red and purple leaves to take over Mid-Missouri, this weekend is the ultimate make-or-break moment. We are officially entering our prime window for autumn color, but the drastic…
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First Alert Weather Day Today: Low Severe Storm Chance 2 - 7PMKMOV - Outlying Areas Could See Frost Saturday AM and Sunday AM Today: Expect lots of cloud cover today with temperatures nearing 80°. Isolated Severe Storms Remain Possible this Afternoon from 2PM- 7PM: This is a…
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First Alert Weather Day Today: Low Severe Storm Chance This Afternoon-Early EveningKMOV - Outlying Areas Could See Frost Saturday AM and Sunday AM Today: Scattered showers and storms push through the region during the morning hours. Temperatures remain into the upper 60s and lower 70s during this…
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Damaging Winds Possible in Illinois and Missouri ThursdayParts of Missouri and most of Illinois are likely to experience the type of thunderstorm you'd expect to see during the Spring months. Forecasters are warning of a possible damaging wind event that will likely leave…
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This week's record heat caps hottest Jan.-Sept. on record in USIf it feels like summer never left, the numbers back you up. This week brought a fresh wave of record-breaking heat across the country, even as calendars flip toward Halloween. In a word: hot. According to U.S. National…
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Cold Front Ends Record October Heat Across the United StatesRecord-breaking October warmth across the central and eastern United States is giving way to a sharp cooldown, with a powerful cold front expected to bring rain, strong winds and scattered temperatures in the 40s by the…
- Daily high-temperature records broken or tied on October 13 across parts of the central U.S.
Five daily high-temperature records were broken and one was tied at six sites across Kansas, Oklahoma, Missouri and Illinois on October 13, 2026. Temperatures at the sites reached 32.8–33.9°C (91–93°F), or 9.4–13.3°C…
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St. Louis hits record high of 93 degrees in mid-OctoberSt. Louis reached a record high of 93 degrees on Tuesday. ST. LOUIS, Mo. (First Alert 4) - St. Louis reached a record high of 93 degrees on Tuesday. Temperatures in the 90s arrived as some seasonal preparations…
- Weather whiplash incoming: Record October heat could flip to first snow
It’s mid-October, so wild temperature changes can be expected across the country. This week will be no exception. A major, record-breaking warm-up followed by a bone-chilling cooldown across much of the central and…
Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
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
Almanac
MonthlySt Louis Area, records since 1874. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- St. Louis 11 km
- O'Fallon 38 km
- Saint Charles 21 km
- Saint Peters 32 km
- Florissant 16 km
- Chesterfield 22 km
- Belleville 33 km
- Oakville 19 km
- Wildwood 30 km
- Wentzville 50 km
- University City 2 km
- Ballwin 20 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 16 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.