Saint Peters, Missouri Weather Conditions

Severe Weather Alerts

National Weather Service:

Heat Advisory View All Alerts

Your Weather

To update your location please enter your ZIP code, city, state, airport code or country in the field below. Weather by E-mail: Forecast storm alerts. Weather E-Mail Alert Sign Up »

Current Conditions

  • 72°
  • Clear
  • Wind: Calm
  • Humidity: 81%
  • Visibility: 10.0 miles
  • Dew Point: 66°
  • Pressure: 29.86 in. -

Select a Section

Click a section below for more information.

Next 12 Hours

1  am
4  am
7  am
10  am
1  pm
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Chance of a Thunderstorm
Chance of T-storms
70°
72°
70°
86°
91°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Saturday
  • Chance of a Thunderstorm
  • High: 100 °
  • Low: 75 °
  • Chance of T-Storms
  • Sunday
  • Chance of a Thunderstorm
  • High: 90 °
  • Low: 64 °
  • Chance of a Thunderstorm
  • Monday
  • Partly Cloudy
  • High: 79 °
  • Low: 55 °
  • Partly Cloudy
  • Tuesday
  • Partly Cloudy
  • High: 79 °
  • Low: 54 °
  • Partly Cloudy
  • Wednesday
  • Partly Cloudy
  • High: 82 °
  • Low: 59 °
  • Partly Cloudy

Forecast for Saint Peters, Missouri

Updated: 10:00 PM CDT on July 25, 2014

Heat advisory in effect from 1 PM to 7 PM CDT Saturday...
  • Saturday

    Partly cloudy in the morning, then overcast with a chance of a thunderstorm and a chance of rain. High of 100F with a heat index of 108F. Winds from the SW at 10 to 15 mph. Chance of rain 30%.

  • Saturday Night

    Overcast with a chance of a thunderstorm and a chance of rain in the evening, then partly cloudy with a chance of a thunderstorm and a chance of rain. Low of 75F. Winds from the SW at 5 to 10 mph. Chance of rain 30%.

  • Sunday

    Partly cloudy with a chance of a thunderstorm and a chance of rain. High of 90F. Breezy. Winds from the WNW at 10 to 20 mph. Chance of rain 20%.

  • Sunday Night

    Partly cloudy in the evening, then clear. Low of 64F. Winds from the NW at 5 to 15 mph.

  • Monday

    Clear in the morning, then partly cloudy. High of 79F. Winds from the NNW at 10 to 15 mph.

  • Monday Night

    Partly cloudy in the evening, then clear. Low of 55F. Winds from the North at 5 to 15 mph.

  • Tuesday

    Clear in the morning, then partly cloudy. High of 79F. Winds less than 5 mph.

  • Tuesday Night

    Partly cloudy. Low of 54F. Winds less than 5 mph.

  • Wednesday

    Partly cloudy. High of 82F. Winds less than 5 mph.

  • Wednesday Night

    Mostly cloudy. Low of 59F. Winds less than 5 mph.

  • Thursday

    Mostly cloudy. High of 82F. Winds less than 5 mph.

  • Thursday Night

    Partly cloudy with a chance of a thunderstorm. Low of 57F. Winds less than 5 mph. Chance of rain 50%.

  • Friday

    Partly cloudy with a chance of a thunderstorm. High of 82F. Winds less than 5 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Friday Night

    Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 61F. Winds from the NE at 5 to 10 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Saturday

    Partly cloudy with a chance of a thunderstorm. Fog early. High of 81F. Winds less than 5 mph. Chance of rain 30%.

  • Saturday Night

    Partly cloudy with a chance of a thunderstorm. Low of 54F. Winds less than 5 mph. Chance of rain 40%.

  • Sunday

    Partly cloudy with a chance of a thunderstorm. High of 81F. Winds less than 5 mph. Chance of rain 40%.

  • Sunday Night

    Partly cloudy. Fog overnight. Low of 55F. Winds less than 5 mph.

  • Monday

    Partly cloudy with a chance of a thunderstorm. High of 81F. Winds less than 5 mph. Chance of rain 40%.

  • Monday Night

    Clear. Fog overnight. Low of 55F. Winds less than 5 mph.

  • Tuesday

    Clear. High of 82F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Low of 55F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Heat Advisory  Statement as of 3:53 PM CDT on July 25, 2014


... Heat advisory in effect from 1 PM to 7 PM CDT Saturday...

The National Weather Service in St Louis has issued a heat
advisory... which is in effect from 1 PM to 7 PM CDT Saturday.

* Timing... a dangerous combination of heat and humidity is
expected to begin by early Saturday afternoon and remain so
through early evening.

* Heat index values... up to 105 due to temperatures in the mid to
upper 90s... and dewpoints in the lower 70s.

* Impacts... the combination of hot temperatures and high
humidity will likely lead to an increased risk of heat-
related stress and illness. The very Young... the elderly...
those without air conditioning... and those participating in
strenuous outdoor activities will be the most susceptible.
Also... car interiors can reach lethal temperatures in a matter
of minutes.

Precautionary/preparedness actions...

A heat advisory is issued when high temperature and humidity
levels are expected to make it feel like it is 105 degrees or
greater.

People in the St. Louis metropolitan area can get information
about cooling centers or energy assistance related to the
excessive heat by calling the United way of greater St. Louis at
800-427-4626... or if calling from a land line phone dial 2-1-1.
You can also call cool down St. Louis at 314-241-7668.

Take extra precautions if you work or spend time outside. When
possible... reschedule strenuous activities to the early morning
or evening. Know the signs and symptoms of heat exhaustion and
heat stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work... the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency. Call 9-1-1 immediately.



Tes




Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: St. Peters, St. Peters, MO

Updated: 11:02 PM CDT

Temperature: 74.8 °F Dew Point: 67 °F Humidity: 76% Wind: SW at 2.0 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Harmony Ridge, Cottleville, MO

Updated: 2:04 AM CDT

Temperature: 72.1 °F Dew Point: 64 °F Humidity: 76% Wind: Calm Pressure: 29.77 in Hourly Precipitation: - Heat Index: 73 °F Graphs

Location: O'fallon / St. Peters, St. Peters, MO

Updated: 2:05 AM CDT

Temperature: 74.1 °F Dew Point: 70 °F Humidity: 86% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: West Drive, St. Peters, MO

Updated: 2:05 AM CDT

Temperature: 72.1 °F Dew Point: 67 °F Humidity: 82% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 2:05 AM CDT

Temperature: 71.2 °F Dew Point: 61 °F Humidity: 71% Wind: SSE at 3.0 mph Pressure: 29.74 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 2:06 AM CDT

Temperature: 72.1 °F Dew Point: 68 °F Humidity: 85% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Piggy's BBQ, OFallon, MO

Updated: 2:04 AM CDT

Temperature: 74.1 °F Dew Point: 68 °F Humidity: 80% Wind: SSE at 3.0 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 2:05 AM CDT

Temperature: 73.2 °F Dew Point: 68 °F Humidity: 83% Wind: SSE at 1.0 mph Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: Wilshire Valley, St. Charles, MO

Updated: 2:02 AM CDT

Temperature: 72.9 °F Dew Point: 59 °F Humidity: 62% Wind: South at 1.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 2:06 AM CDT

Temperature: 71.7 °F Dew Point: 66 °F Humidity: 82% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Harvester, St. Charles, MO

Updated: 1:53 AM CDT

Temperature: 72.9 °F Dew Point: 68 °F Humidity: 83% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Danielle Downs, St. Peters, MO

Updated: 2:06 AM CDT

Temperature: 72.1 °F Dew Point: 69 °F Humidity: 90% Wind: SW at 1.6 mph Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Hyland Green, O'Fallon, MO

Updated: 2:05 AM CDT

Temperature: 73.4 °F Dew Point: 69 °F Humidity: 87% Wind: Calm Pressure: 29.47 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Twin Chimneys, O'Fallon, MO

Updated: 2:05 AM CDT

Temperature: 72.7 °F Dew Point: 68 °F Humidity: 84% Wind: NE at 2.0 mph Pressure: 29.75 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Royal Oaks, O'Fallon, MO

Updated: 2:06 AM CDT

Temperature: 73.0 °F Dew Point: 68 °F Humidity: 84% Wind: South at 5.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 2:04 AM CDT

Temperature: 72.1 °F Dew Point: 67 °F Humidity: 83% Wind: SSE at 2.0 mph Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: The Boardwalk at WingHaven, OFallon, MO

Updated: 2:05 AM CDT

Temperature: 73.4 °F Dew Point: 68 °F Humidity: 83% Wind: SE at 4.0 mph Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: Dardenne Prairie, Dardenne Prairie, MO

Updated: 2:03 AM CDT

Temperature: 72.0 °F Dew Point: 64 °F Humidity: 77% Wind: SSE at 1.3 mph Pressure: 29.58 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: Lindenwood, St. Charles, MO

Updated: 2:05 AM CDT

Temperature: 71.8 °F Dew Point: 67 °F Humidity: 85% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Ridgepointe-Meadowbrook, Lake Saint Louis, MO

Updated: 2:05 AM CDT

Temperature: 73.8 °F Dew Point: 67 °F Humidity: 80% Wind: South at 3.6 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Locksley Manor, Lake Saint Louis, MO

Updated: 2:05 AM CDT

Temperature: 71.8 °F Dew Point: 69 °F Humidity: 90% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Fox Hill, Saint Charles, MO

Updated: 2:06 AM CDT

Temperature: 73.2 °F Dew Point: 66 °F Humidity: 77% Wind: Calm Pressure: 29.29 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: St. Paul (SJC), OFallon, MO

Updated: 2:05 AM CDT

Temperature: 71.5 °F Dew Point: 68 °F Humidity: 88% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 2:05 AM CDT

Temperature: 71.3 °F Dew Point: 67 °F Humidity: 85% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 70 °F Graphs

Location: Crimson Oaks, Lake Saint Louis, MO

Updated: 2:03 AM CDT

Temperature: 73.5 °F Dew Point: 70 °F Humidity: 88% Wind: SSE at 1.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 2:04 AM CDT

Temperature: 72.7 °F Dew Point: 67 °F Humidity: 83% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Avondale, Wentzville, MO

Updated: 1:55 AM CDT

Temperature: 73.9 °F Dew Point: 69 °F Humidity: 83% Wind: SSW at 5.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Maryland Heights, MO

Updated: 2:02 AM CDT

Temperature: 73.1 °F Dew Point: 67 °F Humidity: 81% Wind: Calm Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: Swaying Oaks, Wentzville, MO

Updated: 2:05 AM CDT

Temperature: 72.5 °F Dew Point: 56 °F Humidity: 57% Wind: Calm Pressure: 29.29 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Creve Coeur, St. Louis, MO

Updated: 2:05 AM CDT

Temperature: 70.9 °F Dew Point: 66 °F Humidity: 83% Wind: Calm Pressure: 29.47 in Hourly Precipitation: 0.00 in Heat Index: 70 °F Graphs

Location: Whispering Hills, Creve Coeur, MO

Updated: 2:06 AM CDT

Temperature: 73.1 °F Dew Point: 66 °F Humidity: 79% Wind: SE at 1.0 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion...updated aviation 
National Weather Service St Louis MO 
1143 PM CDT Fri Jul 25 2014 


Update: 
issued at 938 PM CDT Fri Jul 25 2014 


The 00z mdl data is still just rolling in, so is difficult to 
justify any radical changes to the going forecast. However, the 
sref/local WRF suggest thunderstorms and rain will be possible over nrn and central 
portions of the County Warning Area late tonight and thru sunrise. The hrrr 
suggests this too to some degree as new cycles come in. Believe 
enuf confidence exists to add slight chance pops Sat morning after 
sunrise. Pops late tonight and into Sat morning may need to be 
raised again after more mdl data arrives. Best scenario is that 
thunderstorms and rain will form just north of the County Warning Area on the nose of the low level jet and 
gradually work swd to swwd twd sunrise as the low level jet veers. Mdl 
soundings suggest a fair amount of elevated cape with little to no 
cin by around 09z tonight over at least central portions of the 
County Warning Area. All of that said, the lack of convection is troubling given 
that mdls suggest that at least something shud be going on by now. 
However, the cu field developing over far sern Iowa does give some 
hope that the mdls may not be far off. 




&& 


Short term: (through late tonight) 
issued at 403 PM CDT Fri Jul 25 2014 


A thunderstorm complex, which began the day over far northeastern MO 
and west-central IL, never fully died and has been working its way 
inexorably southeast with several waves of precipitation. The final 
wave is progressing thru stl Metro now and will deliver a quick shot 
of rain. It is weakening, despite being more successful at pushing 
this far south than the other waves, and doubtful how much will 
survive into southeast MO and far southern Illinois. 


A warm front has been effectively held at Bay over western and parts 
of central MO today thanks to the rain-cooled air and thick cloud 
cover downstream which has been steadily reinforced by the 
persistent storms. Temps vary from near 90 just south and west of 
cou/jef to the mid 60s in central Illinois. 


Thunderstorms and rain complex should be out of the County Warning Area by 00z early this evening, if 
not dissipated, and at that point, warm front should begin its 
advance. If we clear out enough, could see a drop in the evening to 
where overnight mins may occur around midnight before a steady or 
slow rise occurs after midnight as warm front edges through. Would 
not be surprised to see another round of thunderstorms and rain fire to the north 
ahead of the warm front and where better upper support is, with what 
does develop then trying to push southeast into our region very late 
tonight again or Saturday morning. The expected path of this pcpn 
should be further east than what we saw with this event today due to 
the anticipated position of the warm front. 


Prefer something along the lines of the cooler mav temps in the 
east, and approaching the warmer met MOS in central MO. 


Tes 


Long term: (saturday through next friday) 
issued at 403 PM CDT Fri Jul 25 2014 


Two items of concern for Saturday. First: the 850mb thermal ridge 
is still forecast to to build almost directly across the I-70 
corridor Saturday. MOS temperatures in the mid to upper 90s still 
look very reasonable under the thermal ridge with low to mid 90s on 
either side. With low to mid 70s dewpoints entrenched over the 
area, would issue a wide ranging heat advisory along and either side 
the I-70 corridor, however it looks like the atmosphere will mix 
fairly deeply allowing drier air to mix to the surface, especially 
east-northeast of the Ozark Plateau in central Missouri. This 
should keep heat index values below 105 degrees even though it will 
be fairly hot. However, St. Louis looks to be far enough to the 
east northeast that dewpoint temperatures will remain a bit higher 
and the heat island of St. Louis and surrounding urban areas will 
likely keep ambient temperatures higher as well. Heat index 
values kiss 105 for a couple of hours Saturday afternoon, so will go 
ahead and issue a Metro area heat advisory. 


The second concern is severe weather for Saturday afternoon and 
night. Models continue to show impressive instability between 
4000-5000 j/kg developing Saturday afternoon above a capping 
inversion in the low levels. Am leaning toward the GFS solution 
which would initiate convection during the late morning or early 
afternoon Saturday somewhere over western Iowa as a shortwave 
ripples by and wipes out the cap. Think storms should grow upscale 
into a severe mesoscale convective system and push east southeast with the primary threat 
being damaging winds. I think the greatest area of concern is 
actually across southeast Iowa into central Illinois. However, 
given the degree of instability and uncertainty regarding the 
strength of the cap on the northern edge of the low level baroclinic 
zone, I cannot totally rule out severe weather over our area 
Saturday afternoon and Saturday night. 


Cold front will move thought the area Sunday morning and should be 
down across the Ozarks by 18z. Expect there will be isolated to 
scattered convection continuing along the front as it passes. 
Should also see a decent warm up on Sunday as cool air lags behind 
the actual wind shift by a bit. However, it should get noticeably 
drier fairly rapidly after frontal passage so no heat advisory should be 
needed for Sunday. 


Medium range models remain locked on a highly amplified solution 
next week with an abnormally deep longwave trof over the eastern 1/2 
of North America and a very Sharp Ridge over the west. This will 
keep the Mississippi Valley locked in northwest flow aloft. This 
will allow cool and dry Canadian air to push across the eastern 1/2 
of the Continental U.S.. the deep trof should allow steep lapse rates to 
develop over the area which will likely produce isolated showers and 
possibly a few thunderstorms in the afternoon as the airmass begins 
to modify later in the week. 


Carney 


&& 


Aviation: (for the 06z tafs through 06z Saturday night) 
issued at 1131 PM CDT Fri Jul 25 2014 


VFR fcst with a couple chances of tstms. The first being a low 
probability of precip around the Metro area around sunrise. There 
is a chance that the low level jet could aid in convection breaking out along 
a warm front across sthrn Iowa and nthrn MO overnight. The bndry stretches 
from S cntrl Iowa southeast along the MS rvr and into the lower MS Vly. Feel 
chance of occurrence is too low to include mention attm. The next 
chance is late Saturday aftn...thru the evng and into the 
overnight hrs...esp for KUIN...as a cold front sags into the 
region. With concerns over coverage and timing...have left the 
fcst for now. Otherwise...expect winds aob 12kts with a srly component. 


Specifics for kstl: 


VFR fcst with minimal chances for precip thru the prd. First 
chance is around sunrise...but is too low to include attm. The 
other chance is during the evng and into the overnight...but 
coverage and timing issues preclude inclusion in the fcst attm. 


2% 


&& 


Lsx watches/warnings/advisories: 
MO...heat advisory from 1 PM to 7 PM CDT Saturday for St. Charles MO- 
St. Louis city MO-St. Louis MO. 


Illinois...heat advisory from 1 PM to 7 PM CDT Saturday for Madison IL-St. 
Clair Illinois. 


&& 


$$ 


Weather forecast office lsx 



National Weather Service Glossary of Abbreviations

Non-Expanded Version (with abbreviations)

Powered by the Weather Underground, Inc.