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St. Joseph, Missouri 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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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: 1:27 am CDT Sep 2, 2026 |
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Overnight
 Partly Cloudy
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Wednesday
 Hot
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Wednesday Night
 Mostly Clear
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Thursday
 Hot
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Thursday Night
 Mostly Clear
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Friday
 Hot
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Friday Night
 Partly Cloudy
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Saturday
 Hot
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Saturday Night
 Partly Cloudy
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| Lo 76 °F |
Hi 98 °F |
Lo 77 °F |
Hi 98 °F |
Lo 77 °F |
Hi 97 °F |
Lo 76 °F |
Hi 98 °F |
Lo 75 °F |
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Heat Advisory
Hazardous Weather Outlook
Overnight
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Partly cloudy, with a low around 76. South wind around 6 mph. |
Wednesday
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Sunny and hot, with a high near 98. Heat index values as high as 103. Southwest wind 8 to 11 mph, with gusts as high as 20 mph. |
Wednesday Night
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Mostly clear, with a low around 77. South wind 7 to 9 mph. |
Thursday
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Sunny and hot, with a high near 98. Heat index values as high as 103. South southwest wind 7 to 13 mph, with gusts as high as 20 mph. |
Thursday Night
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Mostly clear, with a low around 77. South wind 6 to 9 mph. |
Friday
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Sunny and hot, with a high near 97. |
Friday Night
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Partly cloudy, with a low around 76. |
Saturday
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Mostly sunny and hot, with a high near 98. |
Saturday Night
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Partly cloudy, with a low around 75. |
Sunday
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Mostly sunny, with a high near 96. |
Sunday Night
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Partly cloudy, with a low around 72. |
Labor Day
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Mostly sunny, with a high near 92. |
Monday Night
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Mostly cloudy, with a low around 74. |
Tuesday
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Partly sunny, with a high near 92. |
Forecast from NOAA-NWS
for Saint Joseph MO.
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Weather Forecast Discussion
696
FXUS63 KEAX 020447
AFDEAX
Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
1147 PM CDT Tue Sep 1 2026
.KEY MESSAGES...
- Well above normal temperatures expected to continue through the
end of the week, likely through early next week.
- Heat advisory expanded to the entire area through Friday
- Will likely need to be extended into or through the weekend
- Temperatures in the mid 90s to near 100
- Heat index values as high as 105
&&
.DISCUSSION...
Issued at 238 PM CDT Tue Sep 1 2026
With an expansive upper ridge occupying the southeastern third of
the country, well above normal temperatures continue to be the
primary concern through the entire forecast. The core of this upper
ridge will shift east over the next couple of days, which may lead
to a degree or two cooler high temperatures. This is still 10-15
degrees above normal for this time of year. So overall, little, if
any, relief to the heat is expected through the end of the week,
and quite possibly through the start of next week as well. The
heat advisory will likely need to be extended in time but there
is some uncertainty about the locations. Given that is still day
5 of the forecast, will hold off for now and continue to
message the heat through the DSS packet. Looking at ensemble
guidance and 500mb clusters, the pattern is overall little
changed as the upper ridge builds back into and expands across
the middle of the country. By days 6 and 7 (Sunday and Monday),
a few of the ensembles (generally 5-10%) are showing some easing
of the ridging in the middle of the country with some negative
differences appearing between those clusters relative to the
ensemble mean. This is still very unlikely to occur but what`s a
prolonged heat wave without some hope that it will end...
eventually.
Regarding precipitation chances, it`s unlikely we`ll see much of
anything through the end of the week. By Sunday, there is at least a
small chance in our northeastern zones as the ridge is in the
process of expanding across the middle of the country again. That
said, the prevailing theme remains hot with little, if any,
precipitation through the entire forecast.
&&
.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/...
Issued at 1136 PM CDT Tue Sep 1 2026
VFR conditions expected through the period. There will be light
winds out of the south until mid-morning Tuesday when winds and
marginal gusts will pick up and continue until around sunset
when gusts will die off and wind speeds will decrease. A
scattered cumulus deck will develop during peak heating south of
the MO River.
&&
.EAX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory until 8 PM CDT Friday for MOZ001>008-011>017-
020>025-028>033-037>040-043>046-053-054.
Air Quality Alert from 9 AM to 7 PM CDT Wednesday for
MOZ028>030-037-043.
KS...Heat Advisory until 8 PM CDT Friday for KSZ025-057-060-102>105.
Air Quality Alert from 9 AM to 7 PM CDT Wednesday for KSZ057-
103>105.
&&
$$
DISCUSSION...CDB
AVIATION...IPC
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