National Weather Service Forecast for: Florissant MO
Issued by: National Weather Service Saint Louis, MO
Updated: 4:10 am CDT Jun 22, 2026
 
Today

Today: Mostly cloudy, with a high near 75. North wind 8 to 11 mph.
Mostly Cloudy

 Tonight

Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 61. North wind 5 to 7 mph becoming calm in the evening.
Decreasing
Clouds

 Tuesday

Tuesday: Sunny, with a high near 82. Calm wind becoming east around 5 mph.
Sunny

 Tuesday
Night
Tuesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 65. East wind 3 to 5 mph.
Partly Cloudy
then Slight
Chance
Showers
 Wednesday

Wednesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Southwest wind around 6 mph.
Chance
Showers then
Chance
T-storms
 Wednesday
Night
Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 67.
Slight Chance
T-storms

 Thursday

Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84.
Mostly Sunny
then Chance
T-storms
 Thursday
Night
Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Chance
T-storms

 Friday

Friday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Chance
Showers then
Chance
T-storms
Hi 75 °F Lo 61 °F Hi 82 °F Lo 65 °F Hi 83 °F Lo 67 °F Hi 84 °F Lo 66 °F Hi 83 °F

 

Today
 
 Mostly cloudy, with a high near 75. North wind 8 to 11 mph.
Tonight
 
 Mostly cloudy, then gradually becoming mostly clear, with a low around 61. North wind 5 to 7 mph becoming calm in the evening.
Tuesday
 
 Sunny, with a high near 82. Calm wind becoming east around 5 mph.
Tuesday Night
 
 A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 65. East wind 3 to 5 mph.
Wednesday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Southwest wind around 6 mph.
Wednesday Night
 
 A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 67.
Thursday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84.
Thursday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Friday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Friday Night
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 69. Chance of precipitation is 70%.
Saturday
 
 A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Saturday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday
 
 Mostly sunny, with a high near 93.

 

Forecast from NOAA-NWS for Florissant MO.