Saint Charles, Missouri Weather Conditions

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Current Conditions

  • 90°
  • Clear
  • Wind: SSW 8 mph
  • Humidity: 57%
  • Visibility: 9.0 miles
  • Dew Point: 73°
  • Pressure: 29.97 in. +
  • Heat Index: 98

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Next 12 Hours

4  pm
7  pm
10  pm
1  am
4  am
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
Thunderstorm
T-storms
91°
93°
81°
79°
72°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Clear
  • High: 93 °
  • Low: 72 °
  • Clear
  • Wednesday
  • Chance of a Thunderstorm
  • High: 86 °
  • Low: 59 °
  • Chance of T-Storms
  • Thursday
  • Clear
  • High: 81 °
  • Low: 63 °
  • Clear
  • Friday
  • Partly Cloudy
  • High: 82 °
  • Low: 73 °
  • Partly Cloudy
  • Saturday
  • Chance of a Thunderstorm
  • High: 90 °
  • Low: 70 °
  • Chance of T-Storms

Forecast for Saint Charles, Missouri

Updated: 4:00 PM CDT on July 22, 2014

  • Tuesday

    Clear in the morning, then partly cloudy. High of 93F. Winds from the South at 5 to 10 mph.

  • Tuesday Night

    Partly cloudy with a chance of a thunderstorm and a chance of rain, then thunderstorms after midnight. Fog overnight. Low of 72F. Winds from the SSW at 5 to 10 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Wednesday

    Partly cloudy with a chance of a thunderstorm and a chance of rain. High of 86F. Winds from the NNW at 5 to 15 mph. Chance of rain 40%.

  • Wednesday Night

    Partly cloudy in the evening, then clear. Low of 59F. Winds from the NNE at 5 to 15 mph.

  • Thursday

    Clear. High of 81F. Winds from the NE at 5 to 10 mph.

  • Thursday Night

    Clear in the evening, then overcast. Low of 63F. Winds from the NNW at 5 to 10 mph shifting to the ESE after midnight.

  • Friday

    Partly cloudy. High of 82F. Winds from the SSE at 5 to 15 mph.

  • Friday Night

    Overcast in the evening, then partly cloudy. Low of 73F. Winds from the South at 10 to 15 mph.

  • Saturday

    Mostly cloudy with a chance of a thunderstorm and rain, then a chance of rain in the afternoon. High of 90F with a heat index of 97F. Winds from the SSW at 10 to 15 mph. Chance of rain 70% with rainfall amounts near 0.5 in. possible.

  • Saturday Night

    Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 70F. Winds from the SW at 5 to 10 mph. Chance of rain 70% with rainfall amounts near 0.6 in. possible.

  • Sunday

    Clear with a chance of a thunderstorm. High of 91F. Winds from the NW at 10 to 15 mph. Chance of rain 20%.

  • Sunday Night

    Partly cloudy. Low of 68F. Winds from the NNW at 5 to 15 mph.

  • Monday

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

  • Monday Night

    Clear. Low of 57F. Winds less than 5 mph.

  • Tuesday

    Clear. High of 81F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Low of 59F. Winds from the East at 5 to 10 mph shifting to the SSE after midnight.

  • Wednesday

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

  • Wednesday Night

    Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 55F. Winds less than 5 mph. Chance of rain 50% with rainfall amounts near 0.3 in. possible.

  • Thursday

    Clear with a chance of a thunderstorm. High of 79F. Winds less than 5 mph. Chance of rain 50%.

  • Thursday Night

    Clear. Fog overnight. Low of 54F. Winds less than 5 mph.

  • Friday

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

  • Friday Night

    Clear. Fog overnight. Low of 57F. Winds less than 5 mph.

  • Saturday

    Clear. High of 81F. Winds less than 5 mph.

  • Saturday Night

    Clear. Low of 57F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Flood Warning  Statement as of 11:48 am CDT on July 22, 2014


The Flood Warning continues for
the Mississippi River at Grafton.
* At 11:30 am Tuesday the stage was 19.4 feet.
* Flood stage is 18.0 feet.
* Minor flooding is forecast.
* Forecast: the river will fall below flood stage by tomorrow evening.

                   Fld latest 7 a.M. Forecast
location stg obs stg 07/23 07/24 07/25 07/26 07/27

Mississippi River
Grafton 18.0 19.42 18.7 17.6 16.7 16.1 15.9




Lat... Lon 3881 9057 3888 9057 3899 9046 3895 9028
      3882 9048







Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Fox Hill, Saint Charles, MO

Updated: 4:23 PM CDT

Temperature: 94.5 °F Dew Point: 46 °F Humidity: 19% Wind: Calm Pressure: 29.38 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Lindenwood, St. Charles, MO

Updated: 4:23 PM CDT

Temperature: 86.2 °F Dew Point: 76 °F Humidity: 72% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 96 °F Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 4:23 PM CDT

Temperature: 91.4 °F Dew Point: 74 °F Humidity: 57% Wind: SE at 3.5 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: Historic Saint Charles, Saint Charles, MO

Updated: 4:20 PM CDT

Temperature: 90.5 °F Dew Point: 77 °F Humidity: 65% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Polestar Boating Center, St. Charles, MO

Updated: 4:23 PM CDT

Temperature: 90.2 °F Dew Point: 76 °F Humidity: 63% Wind: West at 1.0 mph Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Riverwood Place, Florissant, MO

Updated: 4:23 PM CDT

Temperature: 91.6 °F Dew Point: 76 °F Humidity: 60% Wind: SW at 2.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: West Drive, St. Peters, MO

Updated: 4:23 PM CDT

Temperature: 89.6 °F Dew Point: 76 °F Humidity: 63% Wind: ESE at 1.0 mph Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Wilshire Valley, St. Charles, MO

Updated: 4:17 PM CDT

Temperature: 89.8 °F Dew Point: 64 °F Humidity: 42% Wind: Calm Pressure: 30.07 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Danielle Downs, St. Peters, MO

Updated: 4:23 PM CDT

Temperature: 97.2 °F Dew Point: 78 °F Humidity: 55% Wind: South at 3.1 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 115 °F Graphs

Location: St. Peters, St. Peters, MO

Updated: 4:14 PM CDT

Temperature: 90.6 °F Dew Point: 75 °F Humidity: 60% Wind: SW at 2.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 4:21 PM CDT

Temperature: 92.8 °F Dew Point: 76 °F Humidity: 59% Wind: South at 4.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 106 °F Graphs

Location: Harvester, St. Charles, MO

Updated: 4:15 PM CDT

Temperature: 93.2 °F Dew Point: 78 °F Humidity: 62% Wind: ESE at 1.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 109 °F Graphs

Location: Maryland Heights, MO

Updated: 4:22 PM CDT

Temperature: 89.6 °F Dew Point: 75 °F Humidity: 63% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Jost Farm, Florissant, MO

Updated: 4:20 PM CDT

Temperature: 95.5 °F Dew Point: 70 °F Humidity: 44% Wind: East at 3.8 mph Pressure: 29.76 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

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

Updated: 4:18 PM CDT

Temperature: 92.3 °F Dew Point: 75 °F Humidity: 58% Wind: SSE at 5.3 mph Pressure: 29.90 in Hourly Precipitation: - Heat Index: 104 °F Graphs

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

Updated: 4:23 PM CDT

Temperature: 93.0 °F Dew Point: 78 °F Humidity: 61% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 108 °F Graphs

Location: Creve Coeur, St. Louis, MO

Updated: 4:23 PM CDT

Temperature: 94.3 °F Dew Point: 69 °F Humidity: 44% Wind: Calm Pressure: 29.56 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 4:23 PM CDT

Temperature: 93.9 °F Dew Point: 76 °F Humidity: 57% Wind: South at 1.8 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 108 °F Graphs

Location: Maryland Heights, St Louis, MO

Updated: 4:14 PM CDT

Temperature: 91.9 °F Dew Point: 74 °F Humidity: 56% Wind: South at 5.0 mph Pressure: 29.30 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Harmony Ridge, Cottleville, MO

Updated: 4:08 PM CDT

Temperature: 95.7 °F Dew Point: 76 °F Humidity: 53% Wind: ESE at 3.2 mph Pressure: 29.86 in Hourly Precipitation: - Heat Index: 109 °F Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 4:22 PM CDT

Temperature: 93.1 °F Dew Point: 77 °F Humidity: 59% Wind: SW at 4.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 107 °F Graphs

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

Updated: 4:23 PM CDT

Temperature: 91.2 °F Dew Point: 78 °F Humidity: 66% Wind: Calm Pressure: 30.17 in Hourly Precipitation: 0.00 in Heat Index: 107 °F Graphs

Location: Whispering Hills, Creve Coeur, MO

Updated: 4:23 PM CDT

Temperature: 90.3 °F Dew Point: 74 °F Humidity: 59% Wind: SSE at 1.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Quiet Village, Creve Coeur, MO

Updated: 4:23 PM CDT

Temperature: 90.9 °F Dew Point: 74 °F Humidity: 57% Wind: SSE at 2.0 mph Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Graeser Acres, St. Louis, MO

Updated: 3:29 PM CDT

Temperature: 90.0 °F Dew Point: 73 °F Humidity: 57% Wind: ESE at 1.1 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Piggy's BBQ, OFallon, MO

Updated: 4:20 PM CDT

Temperature: 90.7 °F Dew Point: 75 °F Humidity: 61% Wind: West at 3.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 4:23 PM CDT

Temperature: 91.6 °F Dew Point: 76 °F Humidity: 60% Wind: SE at 1.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

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

Updated: 4:23 PM CDT

Temperature: 90.0 °F Dew Point: 74 °F Humidity: 59% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Hyland Green, O'Fallon, MO

Updated: 4:23 PM CDT

Temperature: 90.3 °F Dew Point: 76 °F Humidity: 64% Wind: Calm Pressure: 29.58 in Hourly Precipitation: 0.00 in Heat Index: 103 °F Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 4:20 PM CDT

Temperature: 93.2 °F Dew Point: 62 °F Humidity: 36% Wind: South at 4.0 mph Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 94 °F Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 4:11 PM CDT

Temperature: 89.1 °F Dew Point: 77 °F Humidity: 67% Wind: South at 3.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

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

Updated: 4:01 PM CDT

Temperature: 90.2 °F Dew Point: 74 °F Humidity: 59% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Ladue Meadows, Creve Coeur, MO

Updated: 4:23 PM CDT

Temperature: 89.6 °F Dew Point: 74 °F Humidity: 61% Wind: SSE at 1.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 4:20 PM CDT

Temperature: 89.7 °F Dew Point: 78 °F Humidity: 68% Wind: Calm Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Royal Oaks, O'Fallon, MO

Updated: 4:23 PM CDT

Temperature: 89.6 °F Dew Point: 77 °F Humidity: 67% Wind: SSW at 4.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: 103 °F Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 4:08 PM CDT

Temperature: 95.7 °F Dew Point: 77 °F Humidity: 55% Wind: SSW at 2.2 mph Pressure: 29.85 in Hourly Precipitation: - Heat Index: 111 °F Graphs

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

Updated: 4:23 PM CDT

Temperature: 89.8 °F Dew Point: 80 °F Humidity: 73% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: 107 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service St Louis MO 
346 PM CDT Tue Jul 22 2014 


Short term: (through late tonight) 
issued at 330 PM CDT Tue Jul 22 2014 


There is a considerable amount of uncertainty in the convective 
evolution and coverage tonight. Dew points in the 70s, strong 
heating and steep mid level lapse rates are currently contributing 
to SBCAPE of 3500-6000 j/kg across the northwest 2/3rds of the County Warning Area 
with the highest values across central and north central MO. There 
also is a significant cap in place due to warm mid level temperatures. 
The big question is when and how much of the cap will be reduced 
as the front moves southward out of Iowa and southeast Nebraska 
into northern MO this evening. Model solutions including the 
convection allowing models are quite varied on quantitative precipitation forecast and implied 
coverage. Recent runs of the hrrr are quite stingy on coverage 
with isolated storms at best. I don't have a great feel for what 
is going to occur, but the deterministic models suggest that height 
falls/cooling aloft should be sufficient to weaken the cap and 
allow for scattered development along front, mainly late this 
evening and especially overnight. I have attempted to follow this 
trend with the greatest coverage along/east of the MS river. The 
severe threat is conditional on development early enough this 
evening to realize the big cape, and the main threat would appear 
to be damaging winds given the warm air aloft. 


Glass 


Long term: (wednesday through next tuesday) 
issued at 330 PM CDT Tue Jul 22 2014 


The cold front should lie roughly from south central Illinois to near 
St. Louis into southwest MO at 12z and exit the County Warning Area by early 
afternoon. There will continue to be a threat of scattered showers 
and storms ahead of the advancing front. Temperatures should be 
cooler tomorrow with the main thrust of cooling and drying in the 
afternoon. Unseasonably deep upper troffing in the eastern U.S. 
Will keep a large surface high dominating the area Wednesday night 
into Friday, with most of this period dominated by lower humidity 
and below average temperatures. 


Beginning late Thursday night and into Friday the threat of precipitation 
will return in association with elevated showers/thundestorms due to 
strong warm advection/moisture transport via a southwesterly low level jet ahead 
of the slowly retreating warm front and in association with impulses 
aloft dropping southeastward along the eastern periphery of the 
upper high. A cold front will then drop through the area Saturday 
afternoon-Sunday as a upper trof digs southeastward from the upper 
MS valley and into the Great Lakes bringing another threat of 
showers and thunderstorms. This upper wave will be part of large 
scale amplification of the upper air pattern across noam and will 
feature another deep trof over the eastern U.S. Through the first 
part of next week and send out July with another period of below 
average temperatures. 


Glass 


&& 


Aviation: (for the 18z tafs through 18z Wednesday afternoon) 
issued at 131 PM CDT Tue Jul 22 2014 


Upper level high retreating some to the west will allow fairly 
strong short wave to drop into into the eastern US bringing 
northwest flow back to the region. Associated surface cold front 
will move through late tonight and Wednesday morning. Forecast 
issue is when, where and if thunderstorms develop. Cooling aloft 
has to occur before the instability disappears. No model is 
convincing enough toexclusively follow. Have blended and followed 
previous forecast putting storm at uin about 00z and gradually 
moving south, into stl at 06z. Models and soundings suggest some 
MVFR cielings Wednesday am. 


Specifics for kstl: nothing out there has convinced ME to change the 
previous forecast. Cwsu concurs to keep the prevailing 
thunderstorms from 06 - 08z...with a couple of hours of MVFR 
ceilings Wednesday am. 


Jpk 


&& 


Lsx watches/warnings/advisories: 
MO...none. 
Illinois...none. 
&& 


$$ 


Weather forecast office lsx 



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