National Weather Service Forecast for: 2 Miles NNE O'Fallon MO
Issued by: National Weather Service Saint Louis, MO
Updated: 3:12 pm CDT Jul 16, 2026
 
This
Afternoon
This Afternoon: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 90. South wind around 5 mph.
Chance
T-storms
 Tonight

Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Chance
T-storms then
Partly Cloudy
 Friday

Friday: A 20 percent chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 91. Heat index values as high as 102. West wind 3 to 8 mph.
Slight Chance
T-storms
 Friday
Night
Friday Night: Mostly clear, with a low around 74. Southwest wind around 6 mph.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 93. West wind 6 to 9 mph.
Sunny

 Saturday
Night
Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Slight Chance
T-storms
 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91.
Sunny then
Slight Chance
T-storms
 Sunday
Night
Sunday Night: Mostly clear, with a low around 73.
Mostly Clear

 Monday

Monday: Sunny, with a high near 95.
Sunny
Hi 90 °F Lo 73 °F Hi 91 °F Lo 74 °F Hi 93 °F Lo 74 °F Hi 91 °F Lo 73 °F Hi 95 °F

 

This Afternoon
 
 A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 90. South wind around 5 mph.
Tonight
 
 A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Friday
 
 A 20 percent chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 91. Heat index values as high as 102. West wind 3 to 8 mph.
Friday Night
 
 Mostly clear, with a low around 74. Southwest wind around 6 mph.
Saturday
 
 Sunny, with a high near 93. West wind 6 to 9 mph.
Saturday Night
 
 A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Sunday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91.
Sunday Night
 
 Mostly clear, with a low around 73.
Monday
 
 Sunny, with a high near 95.
Monday Night
 
 Mostly clear, with a low around 76.
Tuesday
 
 Mostly sunny, with a high near 94.
Tuesday Night
 
 Partly cloudy, with a low around 70.
Wednesday
 
 Mostly sunny, with a high near 86.
Wednesday Night
 
 Mostly clear, with a low around 65.
Thursday
 
 Mostly sunny, with a high near 86.

 

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