Saint Charles, Missouri Weather Conditions

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Current Conditions

  • 70°
  • Mostly Cloudy
  • Wind: SW 6 mph
  • Humidity: 97%
  • Visibility: 1.8 miles
  • Dew Point: 69°
  • Pressure: 29.85 in. +

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Next 12 Hours

4  am
7  am
10  am
1  pm
4  pm
Chance of a Thunderstorm
Chance of T-storms
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
70°
72°
79°
86°
91°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Chance of a Thunderstorm
  • High: 91 °
  • Low: 72 °
  • Chance of a Thunderstorm
  • Thursday
  • Partly Cloudy
  • High: 95 °
  • Low: 73 °
  • Partly Cloudy
  • Friday
  • Partly Cloudy
  • High: 97 °
  • Low: 73 °
  • Partly Cloudy
  • Saturday
  • Partly Cloudy
  • High: 91 °
  • Low: 72 °
  • Partly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 97 °
  • Low: 72 °
  • Partly Cloudy

Forecast for Saint Charles, Missouri

Updated: 10:00 AM CDT on August 19, 2014

Heat advisory in effect from 1 PM this afternoon to 7 PM CDT Sunday...
  • Wednesday

    Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. High of 91F with a heat index of 102F. Winds from the SW at 5 to 10 mph. Chance of rain 20%.

  • Wednesday Night

    Partly cloudy with a chance of a thunderstorm and a chance of rain in the evening, then clear with a chance of a thunderstorm and a chance of rain. Low of 72F. Winds from the WSW at 5 to 10 mph. Chance of rain 20%.

  • Thursday

    Partly cloudy. High of 95F with a heat index of 104F. Winds from the SW at 10 to 15 mph.

  • Thursday Night

    Clear in the evening, then partly cloudy. Low of 73F. Winds from the SW at 5 to 10 mph.

  • Friday

    Partly cloudy in the morning, then clear. High of 97F with a heat index of 102F. Winds from the SW at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Low of 73F. Winds from the SSW at 5 to 10 mph.

  • Saturday

    Partly cloudy. High of 91F. Winds from the SW at 5 to 10 mph.

  • Saturday Night

    Partly cloudy. Low of 72F. Winds from the SSW at 5 to 10 mph.

  • Sunday

    Clear. High of 97F. Winds from the WSW at 5 to 10 mph.

  • Sunday Night

    Partly cloudy. Low of 72F. Winds less than 5 mph.

  • Monday

    Partly cloudy with a chance of a thunderstorm. High of 84F with a heat index of 90F. Winds from the West at 5 to 10 mph. Chance of rain 40%.

  • Monday Night

    Partly cloudy. Low of 72F. Winds from the NE at 5 to 10 mph.

  • Tuesday

    Partly cloudy. High of 88F. Winds from the South at 5 to 10 mph.

  • Tuesday Night

    Clear. Low of 75F. Winds less than 5 mph.

  • Wednesday

    Clear. High of 79F. Winds less than 5 mph.

  • Wednesday Night

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

  • Thursday

    Partly cloudy with a chance of a thunderstorm. High of 79F. Winds less than 5 mph. Chance of rain 40%.

  • Thursday Night

    Mostly cloudy with a chance of a thunderstorm. Fog overnight. Low of 61F. Winds less than 5 mph. Chance of rain 50%.

  • Friday

    Mostly cloudy. High of 79F. Winds less than 5 mph.

  • Friday Night

    Clear. Low of 61F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Heat Advisory  Statement as of 3:10 am CDT on August 20, 2014


... Heat advisory in effect from 1 PM this afternoon to 7 PM CDT
Sunday...

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

* Timing... dangerous levels of heat and humidity will begin on
Wednesday afternoon... and will continue for the rest of the week
and into the upcoming weekend.

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

* 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: Lindenwood, St. Charles, MO

Updated: 3:46 AM CDT

Temperature: 73.1 °F Dew Point: 72 °F Humidity: 97% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 3:46 AM CDT

Temperature: 71.1 °F Dew Point: 70 °F Humidity: 97% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Historic Saint Charles, Saint Charles, MO

Updated: 3:45 AM CDT

Temperature: 73.9 °F Dew Point: 73 °F Humidity: 96% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Foxborough Estates, St. Charles, MO

Updated: 3:46 AM CDT

Temperature: 72.6 °F Dew Point: 71 °F Humidity: 95% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Polestar Boating Center, St. Charles, MO

Updated: 3:46 AM CDT

Temperature: 73.3 °F Dew Point: 73 °F Humidity: 98% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Talbridge, St. Charles, MO

Updated: 3:46 AM CDT

Temperature: 72.9 °F Dew Point: 71 °F Humidity: 94% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Riverwood Place, Florissant, MO

Updated: 3:46 AM CDT

Temperature: 70.9 °F Dew Point: 70 °F Humidity: 97% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Earth City, Earth City, MO

Updated: 4:34 AM EDT

Temperature: 74.5 °F Dew Point: 72 °F Humidity: 93% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: West Drive, St. Peters, MO

Updated: 3:46 AM CDT

Temperature: 71.7 °F Dew Point: 70 °F Humidity: 94% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Wilshire Valley, St. Charles, MO

Updated: 3:32 AM CDT

Temperature: 74.3 °F Dew Point: 65 °F Humidity: 72% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Danielle Downs, St. Peters, MO

Updated: 3:46 AM CDT

Temperature: 71.2 °F Dew Point: 71 °F Humidity: 99% Wind: Calm Pressure: 29.75 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: St. Peters, St. Peters, MO

Updated: 3:46 AM CDT

Temperature: 71.8 °F Dew Point: 70 °F Humidity: 95% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 3:45 AM CDT

Temperature: 69.6 °F Dew Point: 69 °F Humidity: 97% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Harvester, St. Charles, MO

Updated: 3:34 AM CDT

Temperature: 70.9 °F Dew Point: 70 °F Humidity: 96% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Maryland Heights, MO

Updated: 3:42 AM CDT

Temperature: 71.8 °F Dew Point: 71 °F Humidity: 96% Wind: Calm Pressure: 29.75 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Jost Farm, Florissant, MO

Updated: 3:45 AM CDT

Temperature: 69.8 °F Dew Point: 64 °F Humidity: 82% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 3:44 AM CDT

Temperature: 70.7 °F Dew Point: 69 °F Humidity: 93% Wind: Calm Pressure: 29.77 in Hourly Precipitation: - Heat Index: - Graphs

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

Updated: 3:46 AM CDT

Temperature: 71.7 °F Dew Point: 70 °F Humidity: 96% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Creve Coeur, St. Louis, MO

Updated: 3:46 AM CDT

Temperature: 69.4 °F Dew Point: 69 °F Humidity: 100% Wind: Calm Pressure: 29.44 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 3:46 AM CDT

Temperature: 72.7 °F Dew Point: 72 °F Humidity: 97% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Maryland Heights, St Louis, MO

Updated: 3:42 AM CDT

Temperature: 72.3 °F Dew Point: 71 °F Humidity: 95% Wind: Calm Pressure: 29.17 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Harmony Ridge, Cottleville, MO

Updated: 3:44 AM CDT

Temperature: 70.9 °F Dew Point: 68 °F Humidity: 92% Wind: Calm Pressure: 29.75 in Hourly Precipitation: - Heat Index: - Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 3:46 AM CDT

Temperature: 71.7 °F Dew Point: 71 °F Humidity: 97% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Ross Ave, St. Louis, MO

Updated: 3:46 AM CDT

Temperature: 72.0 °F Dew Point: 68 °F Humidity: 86% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

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

Updated: 3:46 AM CDT

Temperature: 73.4 °F Dew Point: 73 °F Humidity: 99% Wind: Calm Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Whispering Hills, Creve Coeur, MO

Updated: 3:46 AM CDT

Temperature: 71.7 °F Dew Point: 70 °F Humidity: 95% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Quiet Village, Creve Coeur, MO

Updated: 3:46 AM CDT

Temperature: 71.7 °F Dew Point: 70 °F Humidity: 96% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Graeser Acres, St. Louis, MO

Updated: 3:46 AM CDT

Temperature: 72.0 °F Dew Point: 68 °F Humidity: 88% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Piggy's BBQ, OFallon, MO

Updated: 3:44 AM CDT

Temperature: 74.4 °F Dew Point: 71 °F Humidity: 89% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 3:45 AM CDT

Temperature: 71.5 °F Dew Point: 71 °F Humidity: 98% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 3:46 AM CDT

Temperature: 71.0 °F Dew Point: 70 °F Humidity: 97% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Hyland Green, O'Fallon, MO

Updated: 3:46 AM CDT

Temperature: 70.3 °F Dew Point: 70 °F Humidity: 98% Wind: Calm Pressure: 29.44 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 3:45 AM CDT

Temperature: 70.1 °F Dew Point: 70 °F Humidity: 98% Wind: Calm Pressure: 29.74 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 3:34 AM CDT

Temperature: 72.9 °F Dew Point: 71 °F Humidity: 95% Wind: Calm Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 3:42 AM CDT

Temperature: 76.5 °F Dew Point: 70 °F Humidity: 80% Wind: Calm Pressure: 29.78 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Ladue Meadows, Creve Coeur, MO

Updated: 3:46 AM CDT

Temperature: 71.8 °F Dew Point: 69 °F Humidity: 91% Wind: Calm Pressure: 29.75 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service St Louis MO 
327 am CDT Wed Aug 20 2014 


Short term: (through tonight) 
issued at 240 am CDT Wed Aug 20 2014 


Main focus thru the period will be pops, which will influence 
temps today and therefore, also headlines. 


There is still some uncertainty regarding heat headlines thru the 
weekend, but will go ahead and issue a heat advisory for portions 
of central and ern MO and SW Illinois. This expansion is due to expected 
heat index values of 100+ for at least 4 days. However, values of 
105+ degrees may be possible across the adv area, especially thurs 
and Fri. This adv may need to be expanded to include counties not 
currently in the adv. However, since criteria is not expected to 
be reached today, will handle that area tomorrow. 


Dewpoints are the main question as portions of central and southeast MO 
have been mixing out well the past few days. These are the areas 
that have seen the least rainfall lately and generally mix out 
well during the day. Have therefore kept the ern Ozarks out of the 
adv for now. 


As for pops...the hrrr, local 4km WRF and the 4km NSSL WRF seem 
to be handling the current convection fairly well. Have therefore 
tailored pops for the remainder of today and into tonight twd 
those solns. In general, ongoing storms over Iowa and far NE MO shud 
move sewd impacting mainly the nrn portions of the County Warning Area this 
morning. Mdls suggest storms developing this afternoon over the 
ern Ozarks or along the MS rvr, but these shud remain isod. For 
tonight, storms shud remain focused along the fnt and where 850mb 
convergence is greatest. Believe the best chances will remain NE 
of the cwa, but have kept slight chance pops along the nern 
counties due to uncertainty. 


A lot of questions remain regarding temps today due to possible 
convection. However, have trended above the cooler MOS, but stayed 
below the warmer MOS. Overall, this verified fairly well 
yesterday. Temps for tonight are a little more complex as mixing 
shud be greater across central MO. However, have trended above the 
warmer MOS due to swly winds thru the night. 


Long term: (wednesday through next tuesday) 
issued at 309 PM CDT Tue Aug 19 2014 


Story will be the heat and humidity. It's finally going to feel 
like Summer with the first real heat wave beginning tomorrow. Have 
decided to hoist an excessive heat warning for the urban zones of 
the greater St. Louis metropolitan area. Temperatures will be in 
the middle 90s tomorrow and rise into the upper 90s through at 
least Sunday. The long duration of afternoon/early evening heat 
index values around 105 degrees will cause life threatening 
conditions for those that do not have access to air conditioning. 


Outside of the urban areas, the heat will increase, but not reach 
advisory levels until Friday. Will let later shifts access the 
need for additional heat headlines. 


There is still a chance, albiet slight, for thunderstorms to 
develop on Wednesday as the warm front lifts through the area. 
After that, i'm not sure we will see any rain until next week when 
a front moves south and stalls somewhere across the Midwest. If 
the front does not make it far enough south - the heat headlines 
will likely have to be extended into the next work week. 


Cvking 


&& 


Aviation: (for the 06z tafs through 06z Wednesday night) 
issued at 1110 PM CDT Tue Aug 19 2014 


A weak cold front was draped from central Illinois thru northern MO late 
this evening and was producing very little in the way of clouds 
and only one cell just to the east of uin. This front is expected 
to move thru our region uneventfully for the next few hours and early 
overnight, before stalling out and eventually retreating to the 
north as a warm front late. When this does happen, scattered 
convection is expected to break out along the front as it pushes 
thru the taf sites thru mid Wednesday morning. Have upgraded to 
thunderstorms in the vicinity mention, but southern extent looking a bit more iffy if front 
does not work its way far enough south as originally expected. Some 
fog is also expected, especially at sus and cps, but will be in a 
narrower window than last night due to the expected clouds and 
convection firing along the warm front. VFR conditions are then 
expected for the remainder of the taf period from late Wednesday 
morning on as the entire area moves into a warm sector setup. 
Surface winds will become S-SW as the warm front moves thru. 


Specifics for kstl: VFR conditions outside of rain are expected 
thru the period. A small window early Wednesday morning for rain 
is anticipated as a warm front moves thru. An outside chance for 
some visibility reductions in mist late tonight as well, but small 
enough to preclude mention in the taf at this time. 


Tes 


&& 


Preliminary point temperatures/pops: 
Saint Louis 95 75 96 77 / 30 10 5 10 
Quincy 89 71 93 73 / 60 20 10 10 
Columbia 95 73 96 74 / 20 10 5 10 
Jefferson City 96 73 97 74 / 10 10 5 10 
Salem 90 72 92 73 / 20 20 10 10 
Farmington 94 70 95 72 / 20 10 5 5 


&& 


Lsx watches/warnings/advisories: 
MO...heat advisory from 1 PM this afternoon to 7 PM CDT Sunday for 
Audrain MO-Boone MO-Callaway MO-Cole MO-Franklin MO- 
Gasconade MO-Jefferson MO-Lincoln MO-Madison MO-Moniteau MO- 
Montgomery MO-Osage MO-St. Charles MO-St. Francois MO-Ste. 
Genevieve MO-Warren MO. 


Excessive heat warning from 1 PM this afternoon to 7 PM CDT 
Sunday for St. Louis city MO-St. Louis MO. 


Illinois...heat advisory from 1 PM this afternoon to 7 PM CDT Sunday for 
Bond Illinois-Calhoun Illinois-Clinton Illinois-Greene Illinois-Jersey Illinois-Macoupin 
Illinois-Marion Illinois-Monroe Illinois-Randolph Illinois-Washington Illinois. 


Excessive heat warning from 1 PM this afternoon to 7 PM CDT 
Sunday for Madison IL-St. Clair Illinois. 


&& 


$$ 


Weather forecast office lsx 



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