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Ballwin, Missouri 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Ballwin MO
National Weather Service Forecast for: Ballwin MO
Issued by: National Weather Service Saint Louis, MO
Updated: 8:37 am CDT Jul 9, 2025
 
Today

Today: Sunny, with a high near 89. North wind around 6 mph.
Sunny

Tonight

Tonight: Mostly clear, with a low around 71. Northwest wind around 6 mph becoming calm  in the evening.
Mostly Clear

Thursday

Thursday: Sunny, with a high near 92. Light southwest wind.
Sunny

Thursday
Night
Thursday Night: Partly cloudy, with a low around 73. Light southeast wind.
Partly Cloudy

Friday

Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 95. South wind 3 to 7 mph.
Sunny then
Slight Chance
T-storms
Friday
Night
Friday Night: A chance of showers and thunderstorms.  Partly cloudy, with a low around 74. Chance of precipitation is 40%.
Chance
T-storms

Saturday

Saturday: A 40 percent chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 89.
Mostly Sunny
then Chance
T-storms
Saturday
Night
Saturday Night: A 30 percent chance of showers and thunderstorms before 1am.  Mostly cloudy, with a low around 69.
Chance
T-storms

Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 87.
Partly Sunny
then Slight
Chance
T-storms
Hi 89 °F Lo 71 °F Hi 92 °F Lo 73 °F Hi 95 °F Lo 74 °F Hi 89 °F Lo 69 °F Hi 87 °F

 

Today
 
Sunny, with a high near 89. North wind around 6 mph.
Tonight
 
Mostly clear, with a low around 71. Northwest wind around 6 mph becoming calm in the evening.
Thursday
 
Sunny, with a high near 92. Light southwest wind.
Thursday Night
 
Partly cloudy, with a low around 73. Light southeast wind.
Friday
 
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 95. South wind 3 to 7 mph.
Friday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 74. Chance of precipitation is 40%.
Saturday
 
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89.
Saturday Night
 
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69.
Sunday
 
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87.
Sunday Night
 
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71.
Monday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Monday Night
 
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Tuesday
 
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

 

Forecast from NOAA-NWS for Ballwin MO.

Weather Forecast Discussion
601
FXUS63 KLSX 091043
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
543 AM CDT Wed Jul 9 2025

.KEY MESSAGES...

- Seasonably warm temperatures are expected into the weekend with
  the warmest day on Friday.

- After a mainly dry day today, the chance for showers and
  thunderstorms will increase over the weekend.


&&

.SHORT TERM...  (Through Late Thursday Afternoon)
Issued at 418 AM CDT Wed Jul 9 2025

Latest surface analysis is showing high pressure centered over
northern Missouri with a stationary front extending from the Great
Lakes into the northern Plains. The high clouds were in the process
of clearing out over the area revealing valley fog in the nighttime
microphysics channel.  Expect this fog to stick around through mid
morning before it will dissipates.  Then expect a mainly dry day as
the HREF is showing the upper trough slowing moving off to the east
with forecast soundings mainly capped over the area today.  The HREF
members are mainly dry into tonight before some members show a MCS
developing over eastern Nebraska/west Iowa late tonight on the nose
of a nocturnal low level jet.  This MCS will eventually move along
the front and into northeast Missouri and west central Illinois by
tomorrow morning. The chance for showers and thunderstorms will
linger along the front over the northern half of the CWA into
Thursday afternoon where MLCAPES will be in the 1500-3000 J/kg. Deep
layer shear will only be in the 15-30 knot range limiting the severe
weather threat.

High temperatures the next two days will be seasonably warm in the
middle 80s to around 90 degrees as 850 mb temperatures are in the 15-
20C range.

Britt

&&

.LONG TERM...  (Thursday Night through Tuesday)
Issued at 418 AM CDT Wed Jul 9 2025

The upper pattern from late this week into early next week will
continue to have Missouri and Illinois sitting on the southern edge
of the active westerlies with large highs over the southern CONUS.
The global models are highlighting a series of troughs moving
through the upper flow with the most LREF members producing rain
Friday night into Saturday and again on Tuesday.  While it will not
be raining all of the time, model PWATS AOA 2" suggest the potential
for some locally heavy rainfall over the weekend.

The warmest day still looks to be Friday with highs in the low to
mid 90s and heat indexes around 100 degrees.  Temperatures through
the weekend into next week look close to July normals ranging from
the mid 80s to around 90 degrees.

Britt

&&

.AVIATION...  (For the 12z TAFs through 12z Thursday Morning)
Issued at 537 AM CDT Wed Jul 9 2025

Low clouds and fog will cause LIFR/VLIFR conditions at all
STL/SUS/CPS/COU/JEF through 14Z this morning. Then mainly dry and
VFR conditions are expected the rest of the period. There is some
potential for the redevelopment of fog again tonight after 06Z,
particularly at JEF/SUS/CPS. Winds will remain light and variable.

Britt

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&

$$

WFO LSX
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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