Missouri · NWS LSX office

Florissant, MO weather

It is 59°F and clear at St. Louis Lambert International Airport as of Oct 28, 1:00 AM CDT. Overnight: Mostly Clear, low near 54°F. Forecast from the National Weather Service, issued Oct 28, 12:56 AM CDT.

Updated Oct 28, 1:23 AM CDT (snapshot)

Current conditions

Temperature

59°F

Clear

Wind

Calm

Humidity 67% · dew point 48°F

Pressure · visibility

30.20 inHg

Visibility 10 mi

Observed at St. Louis Lambert International Airport (KSTL), Oct 28, 1:00 AM CDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Florissant forecast zone right now.

Around the NWS LSX forecast area

No active alerts in zones served by the LSX office near Florissant.

From the alert snapshot of Oct 28, 2026, 2:15 AM EDT. No alerts are active anywhere in Missouri.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Florissant (local time)
TimeTempForecastPrecip. chanceWind
Wed 1 AM58°FMostly Clear2%S 3 mph
Wed 2 AM58°FMostly Clear2%S 3 mph
Wed 3 AM57°FMostly Clear2%S 3 mph
Wed 4 AM55°FMostly Clear2%S 3 mph
Wed 5 AM55°FMostly Clear2%S 2 mph
Wed 6 AM55°FSunny2%S 3 mph
Wed 7 AM54°FSunny2%S 3 mph
Wed 8 AM56°FSunny2%S 3 mph
Wed 9 AM60°FSunny2%S 5 mph
Wed 10 AM66°FSunny2%S 5 mph
Wed 11 AM70°FSunny2%S 6 mph
Wed 12 PM74°FSunny3%S 7 mph
Wed 1 PM77°FSunny2%S 8 mph
Wed 2 PM78°FSunny0%S 9 mph
Wed 3 PM79°FSunny0%S 9 mph
Wed 4 PM80°FSunny2%S 9 mph
Wed 5 PM78°FSunny2%S 8 mph
Wed 6 PM76°FClear0%S 7 mph
Wed 7 PM72°FClear0%SE 7 mph
Wed 8 PM68°FClear0%S 7 mph
Wed 9 PM67°FClear0%S 7 mph
Wed 10 PM66°FClear0%S 7 mph
Wed 11 PM64°FClear0%S 7 mph
Thu 12 AM63°FClear0%S 6 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Florissant can differ.

7-day forecast

Overnight

Low 54°F

Mostly clear, with a low around 54. South wind around 3 mph.

Wednesday

High 79°F·Low 58°F

Sunny, with a high near 79. South wind 3 to 9 mph.

Wednesday Night: Mostly clear, with a low around 58. South wind around 8 mph.

Thursday

High 82°F·Low 58°F

Sunny, with a high near 82. Southwest wind around 7 mph.

Thursday Night: Partly cloudy, with a low around 58. Northeast wind around 3 mph.

Friday

High 79°F·Low 60°F

Partly sunny, with a high near 79.

Friday Night: Mostly cloudy, with a low around 60.

Saturday

High 71°F·Low 58°F

A slight chance of rain showers after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 20%.

Saturday Night: Rain showers likely. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.

Sunday

High 70°F·Low 58°F

A chance of rain showers. Mostly cloudy, with a high near 70. Chance of precipitation is 30%.

Sunday Night: A slight chance of rain showers after midnight. Mostly cloudy, with a low around 58. Chance of precipitation is 20%.

Monday

High 72°F·Low 58°F

A chance of rain showers before noon, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 72. Chance of precipitation is 50%.

Monday Night: Rain showers likely. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.

Tuesday

High 70°F

A chance of rain showers. Mostly cloudy, with a high near 70. Chance of precipitation is 50%.

Nearby cities

Larger cities in the area

Other cities in St. Louis County

See every city we cover in Missouri, or check all active alerts.

About this forecast

Forecast office
Florissant is served by the National Weather Service LSX forecast office, forecast zone MOZ063, county zone MOC189.
Location used
The Census Bureau's internal point for Florissant (38.7997, -90.3271), in St. Louis County. Population: 51,290 (2024 estimate), number 13 of the 36 Missouri cities on this site.
Radar
Nearest NWS radar: KLSX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/38.7997,-90.3271 (forecast issued Oct 28, 12:56 AM CDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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