Saint Peters, Missouri Weather Conditions

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Current Conditions

  • 57°
  • Clear
  • Wind: SE 4 mph
  • Humidity: 77%
  • Visibility: 10.0 miles
  • Dew Point: 50°
  • Pressure: 30.16 in. -

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Next 12 Hours

10  pm
1  am
4  am
7  am
10  am
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Mostly Cloudy
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
54°
57°
55°
57°
64°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Monday
  • Chance of a Thunderstorm
  • High: 75 °
  • Low: 50 °
  • Chance of T-Storms
  • Tuesday
  • Partly Cloudy
  • High: 70 °
  • Low: 45 °
  • Partly Cloudy
  • Wednesday
  • Partly Cloudy
  • High: 68 °
  • Low: 52 °
  • Partly Cloudy
  • Thursday
  • Partly Cloudy
  • High: 72 °
  • Low: 52 °
  • Partly Cloudy
  • Friday
  • Partly Cloudy
  • High: 81 °
  • Low: 59 °
  • Partly Cloudy

Forecast for Saint Peters, Missouri

Updated: 10:00 PM CDT on September 14, 2014

  • Sunday

    Partly cloudy. Fog early. High of 70F. Winds less than 5 mph.

  • Sunday Night

    Partly cloudy. Low of 52F. Winds less than 5 mph.

  • Monday

    Overcast with a chance of a thunderstorm and a chance of rain, then a chance of a thunderstorm and rain showers in the afternoon. High of 75F. Winds from the SSW at 5 to 10 mph. Chance of rain 70%.

  • Monday Night

    Overcast with a chance of rain. Low of 50F. Winds from the North at 5 to 10 mph. Chance of rain 30%.

  • Tuesday

    Clear. High of 70F. Winds from the NNE at 5 to 10 mph.

  • Tuesday Night

    Partly cloudy. Low of 45F. Winds less than 5 mph.

  • Wednesday

    Partly cloudy. Fog early. High of 68F. Winds less than 5 mph.

  • Wednesday Night

    Partly cloudy in the evening, then overcast. Low of 52F. Winds from the East at 5 to 10 mph.

  • Thursday

    Overcast. High of 72F. Winds from the East at 5 to 10 mph.

  • Thursday Night

    Partly cloudy. Low of 52F. Winds from the ESE at 5 to 10 mph.

  • Friday

    Mostly cloudy. Fog early. High of 81F. Winds from the SE at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Low of 59F. Winds from the SSE at 5 to 10 mph.

  • Saturday

    Overcast. High of 82F. Winds from the South at 5 to 10 mph.

  • Saturday Night

    Mostly cloudy with a chance of a thunderstorm. Low of 64F. Winds from the South at 10 to 15 mph. Chance of rain 20%.

  • Sunday

    Mostly cloudy with a chance of a thunderstorm. High of 82F. Winds from the WSW at 5 to 10 mph. Chance of rain 60%.

  • Sunday Night

    Mostly cloudy with a chance of a thunderstorm. Fog overnight. Low of 59F. Winds less than 5 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Monday

    Overcast with a chance of a thunderstorm. Fog early. High of 77F. Winds less than 5 mph. Chance of rain 40%.

  • Monday Night

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

  • Tuesday

    Partly cloudy. High of 75F. Winds less than 5 mph.

  • Tuesday Night

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

  • Wednesday

    Clear. High of 73F. Winds less than 5 mph.

  • Wednesday Night

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

  • Thursday

    Clear. High of 72F. Winds less than 5 mph.

  • Thursday Night

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

Severe Weather Alert Descriptions

 Flood Warning  Statement as of 9:14 PM CDT on September 14, 2014


The Flood Warning continues for
the Mississippi River at Grafton
* until Wednesday evening.
* At 8:30 PM Sunday the stage was 19.9 feet.
* Flood stage is 18.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Forecast: the river recently crested near 20.0 feet late this
afternoon and is forecast to fall back below flood stage Wednesday
evening.

                   Fld latest 7 a.M. Forecast
location stg obs stg 09/15 09/16 09/17 09/18 09/19

Mississippi River
Grafton 18.0 19.92 19.7 19.0 18.4 17.7 17.2




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







Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: St. Peters, St. Peters, MO

Updated: 11:01 PM CDT

Temperature: 60.3 °F Dew Point: 51 °F Humidity: 72% Wind: Calm Pressure: 30.14 in Hourly Precipitation: 0.00 in Graphs

Location: Alpine Ridge, OFallon, MO

Updated: 11:01 PM CDT

Temperature: 56.2 °F Dew Point: 50 °F Humidity: 79% Wind: Calm Pressure: 30.10 in Hourly Precipitation: 0.00 in Graphs

Location: Harmony Ridge, Cottleville, MO

Updated: 10:46 PM CDT

Temperature: 57.0 °F Dew Point: 52 °F Humidity: 83% Wind: SSE at 1.7 mph Pressure: 30.07 in Hourly Precipitation: - Graphs

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

Updated: 11:01 PM CDT

Temperature: 58.5 °F Dew Point: 55 °F Humidity: 88% Wind: Calm Pressure: 30.35 in Hourly Precipitation: 0.00 in Graphs

Location: West Drive, St. Peters, MO

Updated: 11:01 PM CDT

Temperature: 57.4 °F Dew Point: 51 °F Humidity: 78% Wind: Calm Pressure: 30.20 in Hourly Precipitation: 0.00 in Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 11:00 PM CDT

Temperature: 55.2 °F Dew Point: 51 °F Humidity: 86% Wind: SSE at 1.0 mph Pressure: 30.05 in Hourly Precipitation: 0.00 in Graphs

Location: Foxborough Estates, St. Charles, MO

Updated: 11:01 PM CDT

Temperature: 60.0 °F Dew Point: 51 °F Humidity: 73% Wind: East at 1.0 mph Pressure: 30.17 in Hourly Precipitation: 0.00 in Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 11:01 PM CDT

Temperature: 60.1 °F Dew Point: 51 °F Humidity: 72% Wind: SE at 2.0 mph Pressure: 30.14 in Hourly Precipitation: 0.00 in Graphs

Location: Piggy's BBQ, OFallon, MO

Updated: 11:00 PM CDT

Temperature: 60.9 °F Dew Point: 51 °F Humidity: 71% Wind: SSE at 2.0 mph Pressure: 30.17 in Hourly Precipitation: 0.00 in Graphs

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

Updated: 11:01 PM CDT

Temperature: 56.0 °F Dew Point: 50 °F Humidity: 80% Wind: Calm Pressure: 30.38 in Hourly Precipitation: 0.00 in Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 11:00 PM CDT

Temperature: 56.6 °F Dew Point: 52 °F Humidity: 85% Wind: Calm Pressure: 30.18 in Hourly Precipitation: 0.00 in Graphs

Location: Wilshire Valley, St. Charles, MO

Updated: 11:00 PM CDT

Temperature: 60.4 °F Dew Point: 43 °F Humidity: 52% Wind: Calm Pressure: 30.25 in Hourly Precipitation: 0.00 in Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 11:01 PM CDT

Temperature: 57.0 °F Dew Point: 49 °F Humidity: 75% Wind: Calm Pressure: 30.17 in Hourly Precipitation: 0.00 in Graphs

Location: Harvester, St. Charles, MO

Updated: 10:52 PM CDT

Temperature: 54.1 °F Dew Point: 52 °F Humidity: 92% Wind: Calm Pressure: 30.16 in Hourly Precipitation: 0.00 in Graphs

Location: Danielle Downs, St. Peters, MO

Updated: 11:01 PM CDT

Temperature: 56.8 °F Dew Point: 53 °F Humidity: 88% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Graphs

Location: Hyland Green, O'Fallon, MO

Updated: 11:01 PM CDT

Temperature: 53.8 °F Dew Point: 53 °F Humidity: 97% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Graphs

Location: Twin Chimneys, O'Fallon, MO

Updated: 11:00 PM CDT

Temperature: 57.2 °F Dew Point: 51 °F Humidity: 80% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Graphs

Location: Royal Oaks, O'Fallon, MO

Updated: 11:01 PM CDT

Temperature: 55.6 °F Dew Point: 52 °F Humidity: 87% Wind: Calm Pressure: 30.17 in Hourly Precipitation: 0.00 in Graphs

Location: Talbridge, St. Charles, MO

Updated: 11:01 PM CDT

Temperature: 56.8 °F Dew Point: 51 °F Humidity: 81% Wind: Calm Pressure: 30.12 in Hourly Precipitation: 0.00 in Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 10:59 PM CDT

Temperature: 59.6 °F Dew Point: 52 °F Humidity: 75% Wind: Calm Pressure: 30.14 in Hourly Precipitation: 0.00 in Graphs

Location: The Boardwalk at WingHaven, OFallon, MO

Updated: 10:46 PM CDT

Temperature: 55.4 °F Dew Point: 53 °F Humidity: 91% Wind: Calm Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: Dardenne Prairie, Dardenne Prairie, MO

Updated: 10:59 PM CDT

Temperature: 58.0 °F Dew Point: 49 °F Humidity: 73% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Graphs

Location: Lindenwood, St. Charles, MO

Updated: 11:01 PM CDT

Temperature: 57.8 °F Dew Point: 52 °F Humidity: 80% Wind: Calm Pressure: 30.18 in Hourly Precipitation: 0.00 in Graphs

Location: Ridgepointe-Meadowbrook, Lake Saint Louis, MO

Updated: 11:00 PM CDT

Temperature: 58.5 °F Dew Point: 51 °F Humidity: 77% Wind: Calm Pressure: 30.13 in Hourly Precipitation: 0.00 in Graphs

Location: Locksley Manor, Lake Saint Louis, MO

Updated: 11:00 PM CDT

Temperature: 53.8 °F Dew Point: 53 °F Humidity: 97% Wind: Calm Pressure: 30.14 in Hourly Precipitation: 0.00 in Graphs

Location: Fox Hill, Saint Charles, MO

Updated: 10:14 PM CDT

Temperature: 61.2 °F Dew Point: 40 °F Humidity: 45% Wind: Calm Pressure: 29.59 in Hourly Precipitation: 0.00 in Graphs

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

Updated: 11:01 PM CDT

Temperature: 52.9 °F Dew Point: 52 °F Humidity: 96% Wind: Calm Pressure: 30.16 in Hourly Precipitation: 0.00 in Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 11:01 PM CDT

Temperature: 52.4 °F Dew Point: 50 °F Humidity: 93% Wind: Calm Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: Creve Coeur Park - Forest ReLeaf, St. Louis, MO

Updated: 11:00 PM CDT

Temperature: 56.5 °F Dew Point: 54 °F Humidity: 90% Wind: Calm Pressure: 29.67 in Hourly Precipitation: 0.00 in Graphs

Location: Earth City, Earth City, MO

Updated: 11:50 PM EDT

Temperature: 62.1 °F Dew Point: 50 °F Humidity: 65% Wind: ESE at 1.0 mph Pressure: 30.10 in Hourly Precipitation: 0.00 in Graphs

Location: Crimson Oaks, Lake Saint Louis, MO

Updated: 10:56 PM CDT

Temperature: 55.6 °F Dew Point: 51 °F Humidity: 86% Wind: North at - Pressure: 30.12 in Hourly Precipitation: - Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 11:01 PM CDT

Temperature: 57.1 °F Dew Point: 52 °F Humidity: 84% Wind: Calm Pressure: 30.18 in Hourly Precipitation: 0.00 in Graphs

Location: Avondale, Wentzville, MO

Updated: 10:52 PM CDT

Temperature: 51.9 °F Dew Point: 51 °F Humidity: 96% Wind: Calm Pressure: 30.16 in Hourly Precipitation: 0.00 in Graphs

Location: Maryland Heights, MO

Updated: 10:57 PM CDT

Temperature: 58.4 °F Dew Point: 52 °F Humidity: 78% Wind: Calm Pressure: 30.09 in Hourly Precipitation: 0.00 in Graphs

Location: Swaying Oaks, Wentzville, MO

Updated: 11:01 PM CDT

Temperature: 55.9 °F Dew Point: 42 °F Humidity: 59% Wind: Calm Pressure: 29.56 in Hourly Precipitation: 0.00 in Graphs

Location: Creve Coeur, St. Louis, MO

Updated: 11:01 PM CDT

Temperature: 54.3 °F Dew Point: 52 °F Humidity: 91% Wind: Calm Pressure: 29.71 in Hourly Precipitation: 0.00 in 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 
719 PM CDT sun Sep 14 2014 


Short term: (through late tonight) 
issued at 322 PM CDT sun Sep 14 2014 


Low level ridge extending from the Ohio Valley into the lower and 
middle MS valley will drift eastward tonight, but maintain an 
influence on southeast MO and southern Illinois promoting overnight lows 
in the upper 40s. Meanwhile the main concern will be the threat of 
showers and thunderstorms tonight. Westerly flow aloft will advect a 
region of relatively steep mid level lapse rates presently across 
the plains across Missouri and into Illinois tonight. Beneath this, a 
rather broad low level jet will ramp up this evening across the 
Central Plains and veer to more westerly overnight. The 
differential advections will result in elevated instability with the 
low level jet providing good moisture transport/warm advection and lift. 
Current thoughts are elevated showers and thunderstorms will develop 
near the terminus of low level jet with showers and thunderstorms spreading 
across northern MO and into west central Illinois during the late night 
hours. Given the progressive nature of the flow aloft, I have 
favored the more agressive eastward and southern extent of the NAM 
and local WRF. 


Glass 


Long term: (monday through next sunday) 
issued at 322 PM CDT sun Sep 14 2014 


(monday through wednesday) 


Main concern deals with precipitation chances through Monday night. 


The GFS and NAM are in decent agreement with the speed and depth of 
the shortwave trough currently that is dropping south into Montana 
that is expected to deepen and move southeast across Missouri and 
Illinois late on Monday. Expect the greatest concentration of 
showers and thunderstorms to be across central and northeast 
Missouri and west central Illinois on Monday morning where the GFS 
and NAM is showing the strongest low level moisture convergence 
ahead of the approaching trough. This morning's 12z NSSL WRF 
depicts this idea, showing showers and thunderstorms over northern 
Missouri on Monday morning. Will keep categorical pops going during 
morning, and then keep likely pops going into the afternoon over 
central parts of the County Warning Area as the cold pushes south through the County Warning Area. 
There will be some lingering showers over southeast Missouri into 
southern Illinois into Monday night as the cold front exits the area. 


Tuesday and Tuesday night then will be dry as heights rise behind 
the trough. I did add some slight chances of thunderstorms across 
central Missouri on Wednesday and Wednesday night as the GFS has 
been consistent in showing some light quantitative precipitation forecast with a weak shortwave 
moving southeast across the area in northwesterly flow aloft. 


For temperatures, I used a blend of MOS guidance tomorrow, favoring 
the cooler NAM values where I expect there to be precipitation and 
earlier frontal passage in the north earlier in the day. Used a 
blend of MOS guidance for highs on Tuesday which works well in 
mixing down 900mb temperatures. Lows are the the agreeable MOS 
guidance. 


(Thursday through next sunday) 


Still looks like the end of the work week should stay dry as surface 
high moves across the area. The chance of rain will increase next 
weekend as both the European model (ecmwf) and GFS show a trough approaching from the 
west on Saturday with the attendant cold front crossing the area 
Saturday night and Sunday. Temperatures will climb back to near 
normal by late in the week as 850mb temperature climbs into the mid 
teens celsius. 


Britt 
&& 


Aviation: (for the 00z tafs through 00z Monday evening) 
issued at 719 PM CDT sun Sep 14 2014 


Mid cloud deck to continue to develop and spread east across 
forecast area this eveing ahead of next weather system. Then will 
see showers and thunderstorms develop on nose of low level jet and 
spread east into KUIN by 08z. As low level jet veers to the east 
towards daybreak, activity to slide southeast towards rest of taf 
sites. Coverage to become more scattered in nature for sites along 
I-70 corridor, so just kept vcnty shower/thunderstorm mention 
through the afternoon hours, even after front moves through 
region. Could see MVFR cigs behind frontal boundary, especially 
taf sites along I-70, so added mention. Begin to dry things out by 
late afternoon. As for winds, to persist from the southeast to 
south ahead of front, then veer to the west, then to the north by 
Monday afternoon. 


Specifics for kstl: 
mid cloud deck to continue to develop and spread east across 
forecast area this eveing ahead of next weather system. Then will 
see showers and thunderstorms develop on nose of low level jet and 
spread east into northeast MO. As low level jet veers to the east 
towards daybreak, activity to slide southeast towards Metro area. 
Coverage to become more scattered in nature, so just kept vcnty 
shower/thunderstorm mention through the afternoon hours, even 
after front moves through region around 20z Monday. Could see MVFR cigs 
behind frontal boundary, so added mention after 01z Tuesday as 
Metro area dries out. As for winds, to persist from the southeast to 
south ahead of front, then veer to the west by 20z Monday, then to the 
north by 01z Tuesday. 


Byrd 
&& 


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


$$ 
Weather forecast office lsx 










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