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Florissant, MO 63034 Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
This Afternoon
Sunny, with a high near 77. East wind around 2 mph.
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Tonight
Patchy fog after 5am. Clear, with a low around 48. East wind 0 to 3 mph.
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Friday
Patchy fog before 9am. Sunny, with a high near 75. Southeast wind 3 to 7 mph.
National Weather Service forecast updated 4 hrs ago.
Hourly
Hourly forecast- Now74°
- 6 PM71°
- 7 PM65°
- 8 PM61°
- 9 PM60°
- 10 PM57°
- 11 PM56°
- Fri12 AM55°
- 1 AM54°
- 2 AM53°
- 3 AM52°
- 4 AM50°
- 5 AM49°
- 6 AM49°
- 7 AM49°
- 8 AM49°
- 9 AM55°
- 10 AM61°
- 11 AM66°
- 12 PM70°
- 1 PM72°
- 2 PM73°
- 3 PM74°
- 4 PM75°
10-day forecast
Details- TodayOct 22Sunny48°77°
- FriOct 23Patchy Fog then Sunny48°75°
- SatOct 24Mostly Sunny50°76°
- SunOct 25Mostly Sunny53°78°
- MonOct 26Partly Sunny51°77°
- TueOct 27Partly Sunny51°72°
- WedOct 28Mostly Sunny15%50°73°
- ThuOct 29Cloudy0.06 in44°65°
- FriOct 30Sunny39°53°
- SatOct 31Cloudy40°60°
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
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Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- ThuModerate
- FriModerate
- SatModerate
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 3 hrs ago
Key Messages
- Dry and seasonably warm conditions will persist through the weekend.
Short Term
Issued at 219 PM CDT Thu Oct 22 2026
A slow-moving upper-level ridge will dominate the Mid-Mississippi River Valley through the weekend with dry conditions continuing and only slight variations in above average temperatures. With a gradual exit of the surface high pressure center extending into the CWA this afternoon, the balance of airmass modification and subtle southeasterly low-level CAA through Friday followed by waves of upper-level clouds on Saturday and Sunday combined with weak southerly WAA will contribute to only slight fluctuations of high temperatures within the 70s F. Each night, the most favorable radiational cooling and coolest low temperatures in the 40s F will also become more and more confined to river valleys and southeastern MO/southwestern IL, closest to the high pressure and where clouds will be less prevalent and/or thinner. Patchy river valley fog is expected again Friday morning and potentially Saturday morning but coverage should be less.
Long Term
Issued at 219 PM CDT Thu Oct 22 2026
Global model guidance diverges considerably early to mid-next week in the evolution of an upper-level trough that propagates into the central CONUS Monday into Tuesday as the Omega Block breaks down. The track, amplitude, and tilt of this trough vary across guidance including whether an associated cold front passes through the CWA Tuesday or early Wednesday, enters and then stalls in the CWA, or stalls before reaching the CWA altogether. Accordingly, the NBM interquartile range increases to between 7 and 15 F Tuesday onward, with the 75th percentile remaining steady and the 25th percentile cooling closer to average. If the front reaches the CWA, showers will also become possible, with greatest probabilities of measurable rainfall in global ensemble models across central/northeastern MO and west-central IL at 30 to 50 percent. However, a widespread, substantial rainfall appears unlikely in the ranges of current scenarios. The aforementioned uncertainties persist through the end of the forecast period, late next week.
Aviation
Issued at 1211 PM CDT Thu Oct 22 2026
Dry and VFR flight conditions will persist through the TAF period with the exception of river valley fog again Friday morning. KSUS and KCPS are most favored for a short period of impacts from fog around sunrise Friday. Winds will remain light and eventually become more southeasterly to southerly on Friday.
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.