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Florissant, MO 63034 Weather
Current conditions
Observed at St. Louis Lambert International Airport · 22 min ago
Forecast
10-day-
Overnight
Clear, with a low around 48. Southeast wind around 2 mph.
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Wednesday
Sunny, with a high near 75. Southwest wind around 2 mph.
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Wednesday Night
Mostly clear, with a low around 49. Wind around 0 mph.
National Weather Service forecast updated 1 hr ago.
Hourly
Hourly forecast- Now50°
- 4 AM50°
- 5 AM49°
- 6 AM49°
- 7 AM48°
- 8 AM49°
- 9 AM55°
- 10 AM62°
- 11 AM67°
- 12 PM69°
- 1 PM73°
- 2 PM74°
- 3 PM74°
- 4 PM75°
- 5 PM73°
- 6 PM70°
- 7 PM66°
- 8 PM60°
- 9 PM59°
- 10 PM57°
- 11 PM56°
- Thu12 AM55°
- 1 AM54°
- 2 AM52°
10-day forecast
Details- TonightOct 20Clear48°
- TodayOct 21Sunny49°75°
- ThuOct 22Sunny49°77°
- FriOct 23Sunny49°75°
- SatOct 24Mostly Sunny51°76°
- SunOct 25Mostly Sunny52°78°
- MonOct 26Partly Sunny51°75°
- TueOct 27Slight Chance Rain Showers18%67°
- WedOct 28Cloudy43°58°
- ThuOct 29Sunny38°56°
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 Florissant
More weather news- St. Louis Weather Forecast Friday Through Thursday
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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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Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- WedModerate
- ThuModerate
- FriModerate
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 24 km
- O'Fallon 35 km
- Saint Charles 17 km
- Saint Peters 29 km
- Chesterfield 31 km
- Belleville 44 km
- Oakville 40 km
- Wildwood 42 km
- Wentzville 49 km
- University City 20 km
- Ballwin 34 km
- Upper Alton 15 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 5 hrs ago
Key Messages
- Dry weather along with above normal temperatures are expected to continue through the week into this weekend.
Short Term
Issued at 226 PM CDT Tue Oct 20 2026
There's little change in the forecast this afternoon. An upper level ridge remains over the central CONUS sandwiched between troughs over both coasts. A sprawling surface ridge remains in control of the weather across the Great Lakes, Midwest, and Ohio Valley as well. The upper level omega block and surface ridge will remain in place through the short-term which will continue our stretch of uneventful weather. Temperatures across the forecast area are 3-5 degrees warmer today than yesterday, and it should continue to warm slowly tomorrow and Thursday due to good daytime insolation and light south to southeasterly flow.
Long Term
Issued at 226 PM CDT Tue Oct 20 2026
The omega block begins shifting east Thursday night, and the western trough moves over the Rockies by Friday evening. Medium range deterministic guidance shows the trough fracturing, and the resulting northern stream short wave moves across southern Canada and the northern Great Plains. The cold front attached to the surface reflection of the wave drifts through the Upper Midwest Saturday, and slows down to become nearly stationary across southern Minnesota, Michigan, and nothwest Iowa on Sunday. Models then show another upper level wave diving through southwest Canada Sunday night and into the northern Plains Monday where it phases with the left over southern stream energy. The combined positively tilted trough then digs southeast, which finally pushes the cold front through the Mid Mississippi Valley on Tuesday. All this adds up to continuing dry and warm weather for the Mid Mississippi Valley at least through the weekend south of the cold front, and probably for Monday and Tuesday as well. The LREF continues to show variance in the strength and position of the northern stream trough Friday/Saturday, and the combined trough Sunday through Tuesday. The variance mostly affects locations well north of our forecast area through the weekend. Temperature IQRs in the LREF are only 3-4 degrees in our area through Sunday. However, the IQR increases to 10 degrees across northeast Missouri and west central Illinois as the combined trough and cold front approach the area on Monday. The IQR spreads out to 10-15 degrees across the rest of the area on Tuesday as the members of the LREF attempt to push the front through. The deterministic NBM shows highs dropping from the mid and upper 70s on Sunday and Monday into the 60s Tuesday with the front. However, confidence in the forecast remains low early next week as guidance continues to have some issues with the placement of the front.
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.