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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: 6:31 am CDT Aug 9, 2026 |
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Today
 Slight Chance T-storms then Sunny
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Tonight
 Partly Cloudy
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Monday
 Partly Sunny
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Monday Night
 Partly Cloudy
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Tuesday
 Hot
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Tuesday Night
 Partly Cloudy then Slight Chance T-storms
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Wednesday
 Partly Sunny
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Wednesday Night
 Chance T-storms then Showers Likely
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Thursday
 Showers Likely
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| Hi 97 °F |
Lo 75 °F |
Hi 96 °F |
Lo 79 °F |
Hi 98 °F |
Lo 77 °F |
Hi 94 °F |
Lo 71 °F |
Hi 83 °F |
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Heat Advisory
Hazardous Weather Outlook
Today
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A slight chance of showers and thunderstorms before 7am. Mostly cloudy, then gradually becoming sunny and hot, with a high near 97. Heat index values as high as 107. Light and variable wind becoming south southwest 9 to 14 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 20%. |
Tonight
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Partly cloudy, with a low around 75. South wind 7 to 10 mph. |
Monday
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Partly sunny, with a high near 96. Heat index values as high as 105. South southwest wind 7 to 11 mph, with gusts as high as 20 mph. |
Monday Night
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Partly cloudy, with a low around 79. South wind 9 to 11 mph, with gusts as high as 21 mph. |
Tuesday
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Mostly sunny and hot, with a high near 98. South southwest wind 9 to 11 mph, with gusts as high as 18 mph. |
Tuesday Night
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A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Chance of precipitation is 20%. |
Wednesday
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Partly sunny, with a high near 94. |
Wednesday Night
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A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. Chance of precipitation is 70%. |
Thursday
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Showers likely and possibly a thunderstorm. Cloudy, with a high near 83. Chance of precipitation is 70%. |
Thursday Night
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Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 70%. |
Friday
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A chance of showers. Mostly cloudy, with a high near 82. Chance of precipitation is 50%. |
Friday Night
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Showers and thunderstorms likely. Mostly cloudy, with a low around 68. Chance of precipitation is 70%. |
Saturday
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A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Chance of precipitation is 40%. |
Forecast from NOAA-NWS
for Saint Joseph MO.
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Weather Forecast Discussion
531
FXUS63 KEAX 091128
AFDEAX
Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
628 AM CDT Sun Aug 9 2026
.KEY MESSAGES...
* Hot and humid conditions are expected the first half of the
week. Greatest confidence for persistent dangerous heat is
across central Missouri, where a extreme heat warning has been
issued through Wednesday evening. Farther north, there is less
confidence in high temperatures, and as such, have taken a day
by day approach to headlines.
&&
.DISCUSSION...
Issued at 337 AM CDT Sun Aug 9 2026
Broad upper level ridge across the southern US is going to lead to
heat building into the region for at least the first half of the
week; however, a series of disturbances will challenge the potential
of reaching advisory level heat Monday - Wednesday. A strong low
level jet has developed across the Central Plains extending from the
panhandle of TX into southwest Iowa. This has lead to the
development of elevated storms rooted somewhere near 700 mb. These
storms are largely expected to remain sub severe through the morning
hours, pushing southeast in time. Rainfall amounts are expected to
be generally fairly light, less than a quarter of an inch, but in
areas where there is some training, could see rainfall amounts
approach an inch. Storms should largely push southeast into the
morning hours and weaken after sunrise leading to gradual clearing.
00Z soundings from both SGF and LZK displayed abundant moisture
in the near surface layer. Elevated showers this morning should
also provide additional fuel leading to muggy conditions with
solar heating today. With expected high temperatures in the 90s
and dewpoints in the 70s, expect heat indices to warm towards
105 F this afternoon. Have coordinated a heat advisory
regionwide for today, with the exception of central Missouri
where limited relief from the heat is expected until mid-week.
As a result, have an excessive heat warning beginning today and
continuing into Wednesday evening.
Shortwave building east along the northern periphery of the upper
ridge may interact with the low level jet again tonight leading to
more elevated showers and storms across the region. Residual cloud
cover/elevated showers on Monday leads to uncertainty of high
temperatures across northern Missouri, and as a result, don`t have
heat headlines across northern Missouri beyond today- despite the
potential.
An additional wave on Tuesday leads to the potential for additional
thunderstorms across northern Missouri. Where the convection does
not develop, hot and humid conditions are expected to persist (most
likely across central MO). Northern Missouri remains outlooked
Tuesday and Wednesday for the potential of a strong storm or two.
A stationary boundary to the north is expected to push south on
Wednesday leading to more temperate and seasonal conditions through
the latter half of the week.
&&
.AVIATION /12Z TAFS THROUGH 12Z MONDAY/...
Issued at 625 AM CDT Sun Aug 9 2026
VFR conditions through the period. Elevated showers and storms
are expected to push east across the region by 15Z; thereafter,
gusty south-southwest winds expected the remainder of the day.
&&
.EAX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory from noon today to 8 PM CDT this evening for
MOZ001>008-011>017-020>025-028>033-037-038.
Extreme Heat Warning from noon today to 8 PM CDT Wednesday for
MOZ039-040-043>046-053-054.
KS...Heat Advisory from noon today to 8 PM CDT this evening for
KSZ025-102>105.
Extreme Heat Warning from noon today to 8 PM CDT Wednesday for
KSZ057-060.
&&
$$
DISCUSSION...BT
AVIATION...BT
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