National Weather Service Forecast for: 2 Miles NNE O'Fallon MO
Issued by: National Weather Service Saint Louis, MO
Updated: 5:51 pm CDT Sep 12, 2026
 
Tonight

Tonight: Partly cloudy, with a low around 69. Northwest wind around 6 mph becoming calm in the evening.
Partly Cloudy

 Sunday

Sunday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 84. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 30%.
Chance
Showers

 Sunday
Night
Sunday Night: A 20 percent chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 64. Northeast wind around 6 mph.
Slight Chance
T-storms

 Monday

Monday: Mostly cloudy, then gradually becoming sunny, with a high near 86. East wind 7 to 9 mph.
Decreasing
Clouds

 Monday
Night
Monday Night: Mostly clear, with a low around 71. Southeast wind around 9 mph.
Mostly Clear

 Tuesday

Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.
Sunny then
Slight Chance
T-storms
 Tuesday
Night
Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72.
Slight Chance
T-storms

 Wednesday

Wednesday: Mostly sunny, with a high near 94.
Mostly Sunny

 Wednesday
Night
Wednesday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 73.
Partly Cloudy
then Slight
Chance
Showers
Lo 69 °F Hi 84 °F Lo 64 °F Hi 86 °F Lo 71 °F Hi 96 °F Lo 72 °F Hi 94 °F Lo 73 °F

 

Tonight
 
 Partly cloudy, with a low around 69. Northwest wind around 6 mph becoming calm in the evening.
Sunday
 
 A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 84. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 30%.
Sunday Night
 
 A 20 percent chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 64. Northeast wind around 6 mph.
Monday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 86. East wind 7 to 9 mph.
Monday Night
 
 Mostly clear, with a low around 71. Southeast wind around 9 mph.
Tuesday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.
Tuesday Night
 
 A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72.
Wednesday
 
 Mostly sunny, with a high near 94.
Wednesday Night
 
 A 20 percent chance of showers after 1am. Partly cloudy, with a low around 73.
Thursday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 89. Chance of precipitation is 30%.
Thursday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Friday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Friday Night
 
 A 30 percent chance of showers. Partly cloudy, with a low around 63.
Saturday
 
 A 30 percent chance of showers. Mostly sunny, with a high near 81.

 

Forecast from NOAA-NWS for 2 Miles NNE O'Fallon MO.