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St. Joseph, Missouri 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Saint Joseph MO
National Weather Service Forecast for: Saint Joseph MO
Issued by: National Weather Service Kansas City/Pleasant Hill, MO
Updated: 4:57 pm CDT Sep 4, 2026
 
Tonight

Tonight: Mostly clear, with a low around 75. South wind 5 to 8 mph becoming calm  in the evening.
Mostly Clear

Saturday

Saturday: Sunny and hot, with a high near 99. Heat index values as high as 105. Calm wind becoming southwest around 5 mph in the afternoon.
Hot

Saturday
Night
Saturday Night: Mostly clear, with a low around 74. Light east southeast wind.
Mostly Clear

Sunday

Sunday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm.  Mostly sunny, with a high near 96. Heat index values as high as 103. Calm wind becoming southeast 5 to 7 mph in the afternoon.  Chance of precipitation is 20%.
Mostly Sunny
then Slight
Chance
T-storms
Sunday
Night
Sunday Night: A slight chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 72. East southeast wind around 7 mph.  Chance of precipitation is 20%.
Slight Chance
T-storms

Labor
Day
Labor Day: Mostly sunny, with a high near 95.
Mostly Sunny

Monday
Night
Monday Night: Partly cloudy, with a low around 75.
Partly Cloudy

Tuesday

Tuesday: Mostly sunny and hot, with a high near 100.
Hot

Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 77.
Partly Cloudy

Lo 75 °F Hi 99 °F Lo 74 °F Hi 96 °F Lo 72 °F Hi 95 °F Lo 75 °F Hi 100 °F Lo 77 °F

Extreme Heat Warning
Hazardous Weather Outlook
 

Tonight
 
Mostly clear, with a low around 75. South wind 5 to 8 mph becoming calm in the evening.
Saturday
 
Sunny and hot, with a high near 99. Heat index values as high as 105. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
 
Mostly clear, with a low around 74. Light east southeast wind.
Sunday
 
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 96. Heat index values as high as 103. Calm wind becoming southeast 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
 
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72. East southeast wind around 7 mph. Chance of precipitation is 20%.
Labor Day
 
Mostly sunny, with a high near 95.
Monday Night
 
Partly cloudy, with a low around 75.
Tuesday
 
Mostly sunny and hot, with a high near 100.
Tuesday Night
 
Partly cloudy, with a low around 77.
Wednesday
 
A chance of showers and thunderstorms before 1pm. Mostly sunny and hot, with a high near 97. Chance of precipitation is 30%.
Wednesday Night
 
A chance of showers. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Thursday
 
Mostly sunny, with a high near 92.
Thursday Night
 
A chance of showers. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
Friday
 
Mostly sunny, with a high near 92.

 

Forecast from NOAA-NWS for Saint Joseph MO.

Weather Forecast Discussion
290
FXUS63 KEAX 041910
AFDEAX

Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
210 PM CDT Fri Sep 4 2026

.KEY MESSAGES...

- Hazardous heat continues. An Extreme Heat Warning remains in
  effect areawide until 8 PM Saturday. Areas along and south of a
  line from St. Joseph, MO to Boonville, MO will remain under a
  Extreme Heat Warning until 8 PM Tuesday.

- Low-end chances (20-30%) for rain Sunday into Monday morning,
  generally across northern Missouri. Next rain chances arrive
  midweek.

&&

.DISCUSSION...
Issued at 201 PM CDT Fri Sep 4 2026

No significant changes to the forecast were made in this cycle.
Deterministic and ensemble guidance alike continue to be locked into
a persistent upper-level ridge through about midweek next week. As
such, heat has remained the primary forecast concern for the time
being. A trough over the Pacific Northwest will be one to watch as
the thermal ridge erodes and the trough slides to the east.
This may present a few opportunities for rain midweek next week
but more on that later...

12Z upper-air observations clearly portray the ridge sprawled over
the southern and central CONUS with a largely sedentary low over the
Pacific Northwest and another in the vicinity of Newfoundland and
Labrador. Our position relative to this Omega-block will allow
temperatures to once again soar into the mid/upper 90s areawide,
with high temperatures in our far south potentially reaching triple
digits and heat index values around 105. With little to no change in
the pattern on Saturday, expect similar conditions, just maybe a few
degrees warmer than today. Late Saturday night, a backdoor cold
front is expected to begin moving into the northeast portion of the
CWA and continue sliding south throughout the day on Sunday. It is
possible that some showers may be able to develop in the vicinity of
this boundary so have bumped PoPs into the 20-30% range across
northern Missouri and into the 10-20% range south of US-36 Sunday
afternoon and evening. Counties generally along and north of the
Grand River will have the Extreme Heat Warning end Saturday night as
slightly cooler conditions in the low/mid 90s are expected on Sunday
with the passage of the backdoor cold front and associated cloud
cover/rain chances. South of this corridor, little reprieve is
expected on Sunday as the front is not anticipated to move through
the south and western portions of the CWA until after peak heating
so the Extreme Heat Warning remains in effect along and south of the
Missouri River until Tuesday evening. More marginal conditions are
expected on Monday behind the backdoor cold front, but several
locations are still expected to reach hazardous heat thresholds,
especially those around the KC Metro area and in east-central KS and
west-central MO.

The deamplifying ridge will be hurried west ahead of the then
progressive PNW low sometime midweek. Currently, forecast
temperatures and heat index values on Wednesday would qualify for an
extension of the Extreme Heat Warning. However, there is substantial
uncertainty regarding the timing of the attendant cold front that is
set to sweep across the Plains. The most recent guidance suggests
that this could occur as early as Tuesday night or as late as
Wednesday night. Though an extension was considered during this
forecast cycle, uncertainty was far too high for one to be issued.
Trends will be monitored closely in the days ahead to make this
determination. Rain opportunities may also arrive with this cold
front, but again, there is a lack of precision when it comes to
timing so have retained about 20-30% 6-hourly PoPs from
Wednesday morning into Friday morning to account for
precipitation potential from the cold front as well as any
shortwaves that ripple through a comparatively more zonal
pattern.

&&

.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 1221 PM CDT Fri Sep 4 2026

VFR conditions will continue throughout the TAF period at each site.
Winds are expected to remain out of the SW around 10kts, with gusts
up to 15kts. Gusts will diminish throughout the evening, with a
directional shift out of the S. Clear skies are expected to
persist during the afternoon, with a slight increase in clouds
after sunset on Friday.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
MO...Extreme Heat Warning until 8 PM CDT Tuesday for MOZ020>022-
     028>031-037>040-043>046-053-054.
     Extreme Heat Warning until 8 PM CDT Saturday for MOZ001>008-
     011>017-023>025-032-033.
KS...Extreme Heat Warning until 8 PM CDT Tuesday for KSZ025-057-060-
     102>105.

&&

$$

DISCUSSION...Macko
AVIATION...Bjork
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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