Saint Peters, Missouri Weather Conditions

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Current Conditions

  • 83°
  • Mostly Cloudy
  • Wind: Calm
  • Humidity: 88%
  • Visibility: 10.0 miles
  • Dew Point: 79°
  • Pressure: 29.87 in. -
  • Heat Index: 94

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Next 12 Hours

10  pm
1  am
4  am
7  am
10  am
Partly Cloudy
Partly Cloudy
Clear
Clear
Clear
Clear
Clear
Clear
Overcast
Overcast
82°
82°
79°
79°
86°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Saturday
  • Partly Cloudy
  • High: 93 °
  • Low: 73 °
  • Partly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 95 °
  • Low: 72 °
  • Partly Cloudy
  • Monday
  • Partly Cloudy
  • High: 97 °
  • Low: 73 °
  • Partly Cloudy
  • Tuesday
  • Chance of a Thunderstorm
  • High: 95 °
  • Low: 73 °
  • Chance of a Thunderstorm
  • Wednesday
  • Chance of a Thunderstorm
  • High: 84 °
  • Low: 63 °
  • Chance of T-Storms

Forecast for Saint Peters, Missouri

Updated: 10:00 PM CDT on August 22, 2014

Heat advisory in effect until 7 PM CDT Monday...
  • Friday

    Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. High of 99F. Winds from the SW at 5 to 10 mph. Chance of rain 20%.

  • Friday Night

    Mostly cloudy in the evening, then clear. Low of 77F. Winds less than 5 mph.

  • Saturday

    Overcast in the morning, then partly cloudy. High of 93F. Winds less than 5 mph.

  • Saturday Night

    Partly cloudy in the evening, then clear. Low of 73F. Winds less than 5 mph.

  • Sunday

    Clear in the morning, then partly cloudy. High of 95F with a heat index of 102F. Winds less than 5 mph.

  • Sunday Night

    Partly cloudy in the evening, then clear. Low of 72F. Winds less than 5 mph.

  • Monday

    Partly cloudy. High of 97F with a heat index of 104F. Winds less than 5 mph.

  • Monday Night

    Partly cloudy in the evening, then clear. Low of 73F. Winds from the SE at 5 to 10 mph.

  • Tuesday

    Partly cloudy with a chance of a thunderstorm and rain. High of 95F. Winds from the South at 5 to 10 mph. Chance of rain 20%.

  • Tuesday Night

    Clear. Low of 73F. Winds from the SSE at 5 to 10 mph.

  • Wednesday

    Overcast with a chance of a thunderstorm and rain. High of 84F. Winds from the SSW at 5 to 10 mph. Chance of rain 50% with rainfall amounts near 0.3 in. possible.

  • Wednesday Night

    Mostly cloudy with a chance of a thunderstorm. Fog overnight. Low of 63F. Winds from the WNW at 5 to 10 mph. Chance of rain 50% with rainfall amounts near 0.2 in. possible.

  • Thursday

    Partly cloudy. High of 81F. Winds from the NNW at 5 to 10 mph.

  • Thursday Night

    Clear. Low of 54F. Winds from the NNE at 5 to 10 mph.

  • Friday

    Partly cloudy. High of 81F. Winds less than 5 mph.

  • Friday Night

    Clear. Low of 52F. Winds less than 5 mph.

  • Saturday

    Clear. High of 84F. Winds less than 5 mph.

  • Saturday Night

    Clear. Low of 63F. Winds less than 5 mph.

  • Sunday

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

  • Sunday Night

    Clear. Low of 66F. Winds less than 5 mph.

  • Monday

    Partly cloudy. High of 84F. Winds less than 5 mph.

  • Monday Night

    Clear. Low of 66F. Winds less than 5 mph.

  • Tuesday

    Clear. High of 84F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Fog overnight. Low of 66F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Heat Advisory  Statement as of 3:30 PM CDT on August 22, 2014


... Heat advisory now in effect until 7 PM CDT Monday...

* timing... dangerous levels of heat and humidity will continue
through the weekend.

* Heat index values... up to 108.

* 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. Beat the heat... check the backseat! Never leave
children or pets unattended in a vehicle... not even for a
minute.

Precautionary/preparedness actions...

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.





Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Wilshire Valley, St. Charles, MO

Updated: 8:32 PM CDT

Temperature: 86.7 °F Dew Point: 69 °F Humidity: 55% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Danielle Downs, St. Peters, MO

Updated: 8:33 PM CDT

Temperature: 82.8 °F Dew Point: 81 °F Humidity: 94% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: 95 °F Graphs

Location: Talbridge, St. Charles, MO

Updated: 8:33 PM CDT

Temperature: 85.6 °F Dew Point: 78 °F Humidity: 78% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Harvester, St. Charles, MO

Updated: 8:25 PM CDT

Temperature: 85.1 °F Dew Point: 79 °F Humidity: 81% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: West Drive, St. Peters, MO

Updated: 8:33 PM CDT

Temperature: 83.5 °F Dew Point: 78 °F Humidity: 81% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 93 °F Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 8:30 PM CDT

Temperature: 82.9 °F Dew Point: 79 °F Humidity: 87% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 93 °F Graphs

Location: Historic Saint Charles, Saint Charles, MO

Updated: 8:30 PM CDT

Temperature: 87.2 °F Dew Point: 79 °F Humidity: 77% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Lindenwood, St. Charles, MO

Updated: 8:33 PM CDT

Temperature: 83.6 °F Dew Point: 78 °F Humidity: 84% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 94 °F Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 8:33 PM CDT

Temperature: 84.0 °F Dew Point: 77 °F Humidity: 80% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 94 °F Graphs

Location: Foxborough Estates, St. Charles, MO

Updated: 8:33 PM CDT

Temperature: 86.2 °F Dew Point: 78 °F Humidity: 76% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 8:33 PM CDT

Temperature: 85.5 °F Dew Point: 78 °F Humidity: 79% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Earth City, Earth City, MO

Updated: 9:28 PM EDT

Temperature: 87.9 °F Dew Point: 77 °F Humidity: 71% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: St. Peters, St. Peters, MO

Updated: 8:33 PM CDT

Temperature: 86.7 °F Dew Point: 78 °F Humidity: 76% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 8:32 PM CDT

Temperature: 86.7 °F Dew Point: 80 °F Humidity: 80% Wind: East at 1.0 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Fox Hill, Saint Charles, MO

Updated: 8:33 PM CDT

Temperature: 86.2 °F Dew Point: 69 °F Humidity: 57% Wind: Calm Pressure: 29.32 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 8:30 PM CDT

Temperature: 86.0 °F Dew Point: 78 °F Humidity: 77% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Harmony Ridge, Cottleville, MO

Updated: 8:32 PM CDT

Temperature: 86.2 °F Dew Point: 78 °F Humidity: 78% Wind: Calm Pressure: 29.81 in Hourly Precipitation: - Heat Index: 99 °F Graphs

Location: Whispering Hills, Creve Coeur, MO

Updated: 8:33 PM CDT

Temperature: 86.5 °F Dew Point: 78 °F Humidity: 76% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Quiet Village, Creve Coeur, MO

Updated: 8:33 PM CDT

Temperature: 84.1 °F Dew Point: 78 °F Humidity: 83% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 95 °F Graphs

Location: Maryland Heights, St Louis, MO

Updated: 8:19 PM CDT

Temperature: 87.4 °F Dew Point: 78 °F Humidity: 73% Wind: Calm Pressure: 29.22 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: De Smet Jesuit High School, Creve Coeur, MO

Updated: 8:21 PM CDT

Temperature: 86.1 °F Dew Point: 78 °F Humidity: 76% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Graeser Acres, St. Louis, MO

Updated: 8:33 PM CDT

Temperature: 84.8 °F Dew Point: 76 °F Humidity: 74% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 94 °F Graphs

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

Updated: 8:33 PM CDT

Temperature: 87.8 °F Dew Point: 81 °F Humidity: 81% Wind: Calm Pressure: 30.09 in Hourly Precipitation: 0.00 in Heat Index: 106 °F Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 8:30 PM CDT

Temperature: 83.3 °F Dew Point: 79 °F Humidity: 88% Wind: Calm Pressure: 29.78 in Hourly Precipitation: 0.00 in Heat Index: 95 °F Graphs

Location: St. Ann, MO, St. Ann, MO

Updated: 8:20 PM CDT

Temperature: 84.9 °F Dew Point: 77 °F Humidity: 78% Wind: Calm Pressure: 29.82 in Hourly Precipitation: - Heat Index: 96 °F Graphs

Location: Ladue Meadows, Creve Coeur, MO

Updated: 8:29 PM CDT

Temperature: 83.3 °F Dew Point: 77 °F Humidity: 81% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Riverwood Place, Florissant, MO

Updated: 8:33 PM CDT

Temperature: 84.3 °F Dew Point: 78 °F Humidity: 82% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 96 °F Graphs

Location: Piggy's BBQ, OFallon, MO

Updated: 8:30 PM CDT

Temperature: 88.5 °F Dew Point: 79 °F Humidity: 73% Wind: ESE at 1.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 103 °F Graphs

Location: 1 Mile South of St. Louis Lambert Airport, Woodson Terrace, MO

Updated: 8:33 PM CDT

Temperature: 85.6 °F Dew Point: 79 °F Humidity: 80% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Downtown O'Fallon, O'Fallon, MO

Updated: 8:33 PM CDT

Temperature: 84.0 °F Dew Point: 76 °F Humidity: 77% Wind: Calm Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 93 °F Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 8:33 PM CDT

Temperature: 85.0 °F Dew Point: 78 °F Humidity: 81% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 97 °F Graphs

Location: Twin Chimneys, O'Fallon, MO

Updated: 8:30 PM CDT

Temperature: 86.8 °F Dew Point: 78 °F Humidity: 76% Wind: Calm Pressure: 29.77 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: The Boardwalk at WingHaven, OFallon, MO

Updated: 8:19 PM CDT

Temperature: 86.5 °F Dew Point: 79 °F Humidity: 78% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: APRSWXNET Berkeley MO US, Woodson Terrace, MO

Updated: 4:46 PM CDT

Temperature: 92 °F Dew Point: 74 °F Humidity: 56% Wind: SSE at 1 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 102 °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 
537 PM CDT Fri Aug 22 2014 


Short term: (through late tonight) 
issued at 303 PM CDT Fri Aug 22 2014 


Similar to the past few days, isolated thunderstorms are expected 
across the southern County Warning Area due to terrain influences in the Eastern 
Ozarks. These storms will dissipate with the loss of daytime 
heating. 


Isolated to scattered thunderstorms are also possible across 
northeast MO/west central Illinois tonight in the vicinity of a warm 
front or outflow boundary. Favorable parameters overnight include 
precipitable water values near 2", 700 mb-500 mb lapse rates of 6 to 6.5 deg c/km, 
sufficient MUCAPE for elevated thunderstorms, and a strengthening 
low level jet. At this time, it looks like the best coverage should remain 
to the north of the County Warning Area. 


Kanofsky 


Long term: (saturday through next friday) 
issued at 303 PM CDT Fri Aug 22 2014 


Dangerous levels of heat and humidity will remain across the 
region through the weekend and into early next week. These 
conditions are due to an upper level ridge of high pressure across 
the central Continental U.S. Along with favorable surface winds that will 
maintain high dew points. The heat advisory has been spatially 
extended to cover additional counties in the Eastern Ozarks where 
dew points are no longer expected to mix out each afternoon. The 
lack of substantial mixing will likely result in at least 4 
consecutive days where heat index values exceed 100 degrees f. 
This is supported by the Missouri mesonet site in Crawford County 
near Cook Station, which was already reporting heat index values 
between 100-104 degrees f this afternoon. The heat advisory and 
the excessive heat warning have also been temporally extended 
through Monday evening now that models have reached improved 
agreement on the large scale upper air pattern through Tuesday. 
Some portions of the heat advisory, especially across northern MO 
and west central IL, might be canceled early if convective debris 
cloudiness interferes with heating. 


A cold front is forecast to end the stretch of hot/humid weather 
during the middle of the upcoming week. The best opportunity for 
widespread precipitation appears to be on Wed/Wed night with the 
cold front and passage of the upper trough, but the details are 
still uncertain this far in advance. 


Kanofsky 


&& 


Aviation: (for the 00z tafs through 00z Saturday evening) 
issued at 507 PM CDT Fri Aug 22 2014 


Although there may be isolated thunderstorms across much of the 
area this evening in the humid and unstable environment, the best 
threat for more widespread convection should be in the uin area 
this evening and overnight as a weak warm front lifts northward 
tonight. Will include showers/storms in the uin taf, but leave the 
other tafs dry tonight. Should be just mid-high level clouds outside 
of the convection tonight and Saturday morning, including high 
level convective debris cloudiness. Mainly weak S-swly surface 
winds through the forecast period. 


Specifics for kstl: the latest NAM model run appears overdone 
with its precipitation forecast across east central MO tonight, 
and will follow the other model guidance which keeps the 
convection north and northeast of stl. Just mid-high level 
cloudiness mainly tonight and Saturday morning. The swly surface 
wind will weaken this evening, then only increase to 6-7 kts 
Saturday afternoon. 


Gks 


&& 


Lsx watches/warnings/advisories: 
MO...heat advisory until 7 PM CDT Monday for Audrain MO-Boone MO- 
Callaway MO-Cole MO-Crawford MO-Franklin MO-Gasconade MO- 
Iron MO-Jefferson MO-Knox MO-Lewis MO-Lincoln MO-Madison MO- 
Marion MO-Moniteau MO-Monroe MO-Montgomery MO-Osage MO-Pike 
MO-Ralls MO-Reynolds MO-Shelby MO-St. Charles MO-St. 
Francois MO-Ste. Genevieve MO-Warren MO-Washington MO. 


Excessive heat warning until 7 PM CDT Monday for St. Louis city 
MO-St. Louis MO. 


Illinois...heat advisory until 7 PM CDT Monday for Adams Illinois-Bond Illinois-Brown 
Illinois-Calhoun Illinois-Clinton Illinois-Fayette Illinois-Greene Illinois-Jersey Illinois- 
Macoupin Illinois-Marion Illinois-Monroe Illinois-Montgomery Illinois-Pike Illinois- 
Randolph Illinois-Washington Illinois. 


Excessive heat warning until 7 PM CDT Monday for Madison IL-St. 
Clair Illinois. 


&& 


$$ 


Weather forecast office lsx 












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