Bay St. Louis, Mississippi 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Bay St. Louis MS
National Weather Service Forecast for:
Bay St. Louis MS
Issued by: National Weather Service New Orleans/Baton Rouge, LA |
Updated: 1:46 pm CDT Jun 26, 2025 |
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This Afternoon
 Slight Chance T-storms
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Tonight
 Slight Chance T-storms
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Friday
 Chance T-storms
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Friday Night
 Chance T-storms then Chance Showers
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Saturday
 Chance T-storms then T-storms Likely
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Saturday Night
 Chance T-storms
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Sunday
 T-storms Likely
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Sunday Night
 Chance T-storms
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Monday
 Showers Likely then T-storms Likely
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Hi 90 °F |
Lo 78 °F |
Hi 88 °F |
Lo 78 °F |
Hi 88 °F |
Lo 78 °F |
Hi 89 °F |
Lo 78 °F |
Hi 89 °F |
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This Afternoon
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A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. South wind around 5 mph. |
Tonight
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A slight chance of showers and thunderstorms before 3am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 78. South wind around 5 mph becoming north after midnight. Chance of precipitation is 20%. |
Friday
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A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Northeast wind 5 to 10 mph becoming south in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
Friday Night
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A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 78. Southwest wind 5 to 10 mph. |
Saturday
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Showers and thunderstorms likely, mainly after 1pm. Mostly sunny, with a high near 88. West wind 5 to 10 mph becoming south in the afternoon. Chance of precipitation is 70%. |
Saturday Night
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A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78. Southwest wind 5 to 10 mph. |
Sunday
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Showers and thunderstorms likely, mainly after 1pm. Mostly sunny, with a high near 89. West wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 70%. |
Sunday Night
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A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 78. Southwest wind 5 to 10 mph. |
Monday
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Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Partly sunny, with a high near 89. Southwest wind 5 to 10 mph. |
Monday Night
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A chance of showers and thunderstorms. Mostly cloudy, with a low around 78. West wind 5 to 10 mph. |
Tuesday
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Showers and thunderstorms likely. Partly sunny, with a high near 90. West wind 5 to 10 mph. |
Tuesday Night
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A chance of showers and thunderstorms. Mostly cloudy, with a low around 78. West wind 5 to 10 mph. |
Wednesday
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Showers and thunderstorms likely. Mostly sunny, with a high near 91. West wind 5 to 10 mph. |
Wednesday Night
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A chance of showers and thunderstorms. Partly cloudy, with a low around 78. West wind 5 to 10 mph. |
Thursday
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Showers and thunderstorms likely. Mostly sunny, with a high near 92. Northwest wind 5 to 10 mph. |
Forecast from NOAA-NWS
for Bay St. Louis MS.
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Weather Forecast Discussion
080
FXUS64 KLIX 262045
AFDLIX
Area Forecast Discussion
National Weather Service New Orleans LA
345 PM CDT Thu Jun 26 2025
...New SHORT TERM, LONG TERM, AVIATION, MARINE...
.SHORT TERM...
(This evening through Friday night)
Issued at 344 PM CDT Thu Jun 26 2025
Broad upper level ridge that was nearly overhead has slid farther
east and is beginning to breakdown. Since that hasn`t completely
happened yet, still seeing a mix of convective development with
coverage on the lower side of average for summertime as well as
quite warm temps. CAMs are not particularly reliable for where
storms are/will develop but probably decent on timing and duration
of when we`ll have the most activity between now and midnight
tonight.
MEFFER
&&
.LONG TERM...
(Saturday through Wednesday night)
Issued at 344 PM CDT Thu Jun 26 2025
The upper ridge over the southeast US will become just broad weak
high pressure over the southern half of the country tomorrow into
the middle of next week. That setup will yield little appreciable
subsidence to limit convection, especially with highs in the 90s and
PW`s over 2". The POP forecast reflects this transition to a wet
pattern with coverage around 50% Friday and at least 70% for the
remainder of the 7 day forecast period. The 2 main impacts to
monitor with storms will be downbursts and localized heavy rain.
DCAPE looks to be pretty decent each day over 500j/kg which comes
from typical summertime T/Td profile in the column. For the heavy
rain...thats mainly just a result of weak steering pattern as well
as the seemingly infinite outflow boundaries that`ll be produced
which sometimes aides in repeated rain over a location.
MEFFER
&&
.AVIATION...
(18Z TAFS)
Issued at 344 PM CDT Thu Jun 26 2025
VFR outside TSRA through this cycle. TSRA chances will be a bit
higher today, but mainly along and north of a line from KASD to
KBTR. Did add some PROB30 groups for those terminals.
&&
.MARINE...
Issued at 344 PM CDT Thu Jun 26 2025
Surface ridge will be centered over the eastern Gulf of America over
now into next week. Since not chance of a cold front coming into the
region attm, gradient winds will generally be stable and relatively
weak at 10 kts or less. The bigger impacts, albeit more localized,
will come from daily thunderstorms. Boaters should be congnizant of
developing storms as they can often produce gusts in the 25 to 40
knot range.
MEFFER
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.PRELIMINARY POINT TEMPS/POPS...
MCB 71 91 71 91 / 40 50 20 50
BTR 74 93 74 93 / 30 50 20 60
ASD 72 92 74 92 / 30 50 20 60
MSY 79 93 78 93 / 20 50 20 70
GPT 74 90 75 90 / 30 50 30 70
PQL 72 91 73 91 / 40 60 30 70
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&
$$
SHORT TERM...ME
LONG TERM....ME
AVIATION...ME
MARINE...ME
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