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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 pm CDT Aug 27, 2026 |
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Tonight
 Mostly Clear
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Friday
 Slight Chance Showers then Mostly Sunny
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Friday Night
 Partly Cloudy
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Saturday
 Mostly Sunny
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Saturday Night
 Partly Cloudy
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Sunday
 Hot
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Sunday Night
 Partly Cloudy
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Monday
 Hot
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Monday Night
 Partly Cloudy
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| Lo 63 °F |
Hi 86 °F |
Lo 69 °F |
Hi 91 °F |
Lo 78 °F |
Hi 98 °F |
Lo 79 °F |
Hi 97 °F |
Lo 77 °F |
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Hazardous Weather Outlook
Tonight
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Mostly clear, with a low around 63. North wind around 5 mph becoming calm in the evening. |
Friday
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A slight chance of showers before 8am. Mostly sunny, with a high near 86. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%. |
Friday Night
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Partly cloudy, with a low around 69. South southeast wind 6 to 8 mph. |
Saturday
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Mostly sunny, with a high near 91. South wind 8 to 16 mph, with gusts as high as 26 mph. |
Saturday Night
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Partly cloudy, with a low around 78. South wind around 14 mph, with gusts as high as 24 mph. |
Sunday
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Mostly sunny and hot, with a high near 98. |
Sunday Night
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Partly cloudy, with a low around 79. |
Monday
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Mostly sunny and hot, with a high near 97. |
Monday Night
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Partly cloudy, with a low around 77. |
Tuesday
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Mostly sunny, with a high near 95. |
Tuesday Night
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Mostly clear, with a low around 77. |
Wednesday
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Mostly sunny, with a high near 95. |
Wednesday Night
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Partly cloudy, with a low around 76. |
Thursday
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Mostly sunny, with a high near 94. |
Forecast from NOAA-NWS
for Saint Joseph MO.
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Weather Forecast Discussion
175
FXUS63 KEAX 271747
AFDEAX
Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
1247 PM CDT Thu Aug 27 2026
.KEY MESSAGES...
* Warm conditions to close out the work week. Brief rain showers
possible (15-30% chance) in far northeastern Kansas and
northwestern Missouri during the early morning hours on Friday and
Saturday.
* Heat and humidity building over the weekend and into early next
week. Temperatures in the mid 90s and maximum heat index values
around 100F will be possible.
* Nightly rain chances (20-30%) across far northern Missouri
beginning Monday night through Thursday morning.
&&
.DISCUSSION...
Issued at 1245 PM CDT Thu Aug 27 2026
With high-amplitude ridging encompassing the western CONUS and a
trough axis nosing into the Mid-Atlantic, much of the Plains and
Midwest sits beneath northwesterly flow aloft. A trough looming over
British Columbia and the Pacific Northwest will march the ridge
eastward over the coming days. With the ridge nearing, expect warmer
but still seasonal temperatures in the mid to upper 80s today and
Friday. Early Friday morning, far northeastern Kansas and
northwestern Missouri could see some brief rain showers (15-30%
chance). Storms are expected to initiate in southern South Dakota and
northern Nebraska overnight with an enhancement of the low-level
jet. Some guidance has begun to depict an area of isentropic ascent
in southeastern Nebraska in the early morning hours. With convection
moving generally to the southeast in this northwest flow regime,
this localized area of isentropic forcing may be just enough to
sustain showers into the northern fringes of the CWA. A similar
setup on Saturday morning (just shifted slightly eastward) could
lead to additional rain across northern Missouri.
As the PNW trough slides east and compresses the ridge, high
pressure will eventually be corralled into Oklahoma and Texas over
the weekend. The tight pressure gradient along the ridge apex will
lead to strong southerly flow Saturday into early next week with
sustained winds around 10-15 MPH and gusts around 20-25 MPH. Daytime
cloud cover on Saturday may be able to abate some of the heat,
especially along and north of US-36. As such, maximum temperatures
in the north are expected to generally remain in the mid/upper 80s
again on Saturday. Further south, where confidence in cloud cover is
lesser, temperatures could break into the lower 90s. Even with cloud
cover, Saturday will feel warmer in comparison to the end of the
week with increasing moisture advection which will bring heat index
values into the mid 90s west of US-65. Increasing temperatures and
dewpoints Sunday through at least midweek will lead to several days
of temperatures in the 90s and maximum heat index values around 100F
areawide. HeatRisk is expected to reach Major (Level 3 of 4) Sunday
and continue for the majority of the area through Wednesday, further
signifying the potential for a late summer hazardous heat event.
Shower and storm chances will return just about nightly from Monday
night through Thursday morning. Showers/storms would likely be
focused along the nose of the low-level jet which is expected to
remain mostly north of Kansas and Missouri...a slight southerly
shift could bring these showers into our northern tier or two of
counties, so held onto about 20-30% 6-hourly PoPs during the
evening/overnight/early morning periods Monday through Thursday in
our far north.
&&
.AVIATION /18Z TAFS THROUGH 18Z FRIDAY/...
Issued at 1245 PM CDT Thu Aug 27 2026
VFR conditions are expected throughout the TAF period. Some fair
weather cumulus will persist until evening across the region. Winds
should remain light (around 5 knots) and northerly, shifting to
southeasterly Friday morning. Have a low chance (15-30%) for brief
showers in NW Missouri Friday morning. Some patchy fog may also be
possible near the Missouri River Valley early Friday morning.
&&
.EAX WATCHES/WARNINGS/ADVISORIES...
MO...None.
KS...None.
&&
$$
DISCUSSION...Macko
AVIATION...Shaw
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