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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: 5:56 pm CDT Sep 23, 2026 |
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Tonight
 Partly Cloudy
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Thursday
 Patchy Fog then Partly Sunny
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Thursday Night
 Mostly Cloudy then Chance Showers
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Friday
 Showers Likely
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Friday Night
 Chance Showers then Showers Likely
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Saturday
 Showers
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Saturday Night
 Showers Likely
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Sunday
 Partly Sunny
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Sunday Night
 Partly Cloudy
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| Lo 56 °F |
Hi 74 °F |
Lo 61 °F |
Hi 72 °F |
Lo 63 °F |
Hi 74 °F |
Lo 62 °F |
Hi 76 °F |
Lo 62 °F |
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Tonight
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Partly cloudy, with a low around 56. East wind around 6 mph. |
Thursday
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Patchy fog before 8am. Otherwise, partly sunny, with a high near 74. East southeast wind 5 to 7 mph. |
Thursday Night
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A slight chance of showers before 3am, then a chance of showers after 5am. Mostly cloudy, with a low around 61. East southeast wind around 7 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible. |
Friday
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A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7am. Mostly cloudy, with a high near 72. Southeast wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
Friday Night
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A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 63. East southeast wind around 8 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible. |
Saturday
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Showers and possibly a thunderstorm. High near 74. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible. |
Saturday Night
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Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 62. Chance of precipitation is 60%. |
Sunday
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Partly sunny, with a high near 76. |
Sunday Night
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Partly cloudy, with a low around 62. |
Monday
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Partly sunny, with a high near 77. |
Monday Night
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A chance of showers. Partly cloudy, with a low around 65. Chance of precipitation is 50%. |
Tuesday
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Showers and possibly a thunderstorm. High near 75. Chance of precipitation is 80%. |
Tuesday Night
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A chance of showers. Mostly cloudy, with a low around 60. Chance of precipitation is 50%. |
Wednesday
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A chance of showers. Partly sunny, with a high near 71. Chance of precipitation is 30%. |
Forecast from NOAA-NWS
for Saint Joseph MO.
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Weather Forecast Discussion
749
FXUS63 KEAX 232308
AFDEAX
Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
608 PM CDT Wed Sep 23 2026
.KEY MESSAGES...
- Pleasant fall conditions continue. Highs remain around
seasonal normals.
- Rain chances return Friday continuing through the weekend.
&&
.SHORT TERM /THROUGH THURSDAY NIGHT/...
Issued at 313 PM CDT Wed Sep 23 2026
Pleasant fall weather continues today with highs anticipated in the
mid to upper 70s for most. A building ridge gradually clears out
cloud cover resulting in relatively quiet looking skies. However,
satellite imagery combined with 500mb upper air analysis paints a
rather chaotic picture. The defining features are a pair of high
pressure systems, one over the Great Lakes, and a second along the
Gulf Coast. General troughing dominates the western CONUS. Analysis
depicts a large trough off Baja California coupled with a notable
shortwave across the northern Rockies. The interactions between
these pressure systems have been the main focus of the weather over
the past several days. The Gulf Coast high is building northward
across the central Plains bringing more stable air across the area.
This manifests as clearing clouds and increasing sunshine. RAP
analysis suggests a small low compressed in the 500mb flow between
the two highs which appears to create a small Rex block across the
Ohio River Valley. This would be a small hiccup that temporarily
slows the flow across the continent. Surface winds remain generally
from the east maintaining the flow of cooler and drier air across
the area keeping pleasant fall conditions around through Friday.
&&
.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Issued at 313 PM CDT Wed Sep 23 2026
As we get into Friday and the weekend, the area will start to see
influence from the ongoing ridge pattern interacting with an
omega block. The omega block is formed due to a high pressure
system over the Great Lakes, along with low pressure in New
England and the Pacific Northwest. The interaction of these two
synoptic features will direct shortwaves over our region acting
as our source of lift, which will lead to a cloudy, rainy, and
gloomy weekend. The surface response to the ridging features
will cause a sharp temperature gradient over the area, with mid
80s to our south, and mid to upper 60s to our north.
Additionally, high pressure near the Gulf Coast will advect a
fetch of moisture across the Gulf, and into areas across the
Great Plains. Chances of precipitation are expected starting
Friday morning, with highest likelihood and amounts in our
northwestern counties. Progression of the shortwave eastward
will move precipitation chances across the entire area
throughout the whole day Saturday. Seasonable temperatures and
persistent cloud cover significantly reduce instability, and
limit severe weather chances. However, higher PWAT values of
1.5"-1.75" indicate that heavy downpours will be possible. Rain
and cloud cover are expected to diminish Sunday afternoon
through Sunday night as the system continues to progress.
As the shortwave moves out of the area Monday, the mid level
ridge remains over the area. There is still uncertainty about
how high temperatures may get. If the omega block holds onto
its strength, temperatures will remain seasonable, as it would
stifle warm air advection. On the other side, if the omega
block weakens, this would allow a warmer air mass to move
farther northward into our area, bringing temperatures into the
mid 80s. Ensembles have been leaning toward the omega block
breaking down and moving out of the region, making way for
another disturbance from the Pacific coast. This system would
come through the area Tuesday, bringing increased chances of
rain, and cooler temperatures.
&&
.AVIATION /00Z TAFS THROUGH 00Z FRIDAY/...
Issued at 605 PM CDT Wed Sep 23 2026
VFR conditions through the period with surface high pressure
centered over the western Great Lakes leading to winds from the
east prevailing. Will see an increase in upper level cloud cover
tomorrow ahead of the next disturbance. Considered BR near
sunrise for STJ, but with increasing high clouds, opted to leave
mention out for now.
&&
.EAX WATCHES/WARNINGS/ADVISORIES...
MO...None.
KS...None.
&&
$$
SHORT TERM...
LONG TERM...
AVIATION...BT
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