Saint Peters, Missouri Weather Conditions

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Current Conditions

  • 72°
  • Partly Cloudy
  • Wind: ESE 7 mph
  • Humidity: 73%
  • Visibility: 10.0 miles
  • Dew Point: 63°
  • Pressure: 29.98 in. -

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Next 12 Hours

4  pm
7  pm
10  pm
1  am
4  am
Partly Cloudy
Partly Cloudy
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
88°
84°
77°
73°
72°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Chance of a Thunderstorm
  • High: 88 °
  • Low: 70 °
  • Chance of a Thunderstorm
  • Saturday
  • Chance of a Thunderstorm
  • High: 99 °
  • Low: 72 °
  • Chance of a Thunderstorm
  • Sunday
  • Chance of a Thunderstorm
  • High: 91 °
  • Low: 64 °
  • Chance of T-Storms
  • Monday
  • Partly Cloudy
  • High: 81 °
  • Low: 55 °
  • Partly Cloudy
  • Tuesday
  • Partly Cloudy
  • High: 81 °
  • Low: 54 °
  • Partly Cloudy

Forecast for Saint Peters, Missouri

Updated: 4:00 PM CDT on July 25, 2014

  • Friday

    Partly cloudy. High of 88F. Winds from the South at 5 to 15 mph. Chance of rain 20%.

  • Friday Night

    Partly cloudy with a chance of a thunderstorm and a chance of rain. Low of 70F. Winds from the South at 5 to 15 mph. Chance of rain 20%.

  • Saturday

    Mostly cloudy with a chance of a thunderstorm and a chance of rain. High of 99F with a heat index of 108F. Winds from the SW at 10 to 15 mph. Chance of rain 20%.

  • 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 72F. Winds from the SW at 5 to 10 mph. Chance of rain 40%.

  • Sunday

    Partly cloudy with a chance of a thunderstorm and a chance of rain. High of 91F. Winds from the West at 10 to 15 mph. Chance of rain 30%.

  • Sunday Night

    Partly cloudy. Low of 64F. Winds from the NW at 5 to 15 mph.

  • Monday

    Clear in the morning, then partly cloudy. High of 81F. Winds from the NW at 10 to 15 mph.

  • Monday Night

    Partly cloudy in the evening, then clear. Low of 55F. Winds from the North at 5 to 10 mph.

  • Tuesday

    Clear in the morning, then mostly cloudy. High of 81F. Winds from the North at 5 to 10 mph.

  • Tuesday Night

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

  • Wednesday

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

  • Wednesday Night

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

  • Thursday

    Partly cloudy. High of 81F. 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 40%.

  • Friday

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

  • Friday Night

    Clear with a chance of a thunderstorm. Fog overnight. Low of 55F. Winds less than 5 mph. Chance of rain 20%.

  • Saturday

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

  • Saturday Night

    Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 55F. 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 with a chance of a thunderstorm. Fog overnight. Low of 61F. Winds less than 5 mph. Chance of rain 40%.

  • 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 61F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Wilshire Valley, St. Charles, MO

Updated: 3:32 PM CDT

Temperature: 70.7 °F Dew Point: 59 °F Humidity: 66% Wind: Calm Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: Danielle Downs, St. Peters, MO

Updated: 3:33 PM CDT

Temperature: 75.2 °F Dew Point: 70 °F Humidity: 85% Wind: SSW at 3.8 mph Pressure: 29.85 in Hourly Precipitation: 0.01 in Heat Index: 75 °F Graphs

Location: Harvester, St. Charles, MO

Updated: 3:22 PM CDT

Temperature: 69.6 °F Dew Point: 66 °F Humidity: 87% Wind: SSE at 5.0 mph Pressure: 29.93 in Hourly Precipitation: 0.04 in Heat Index: - Graphs

Location: West Drive, St. Peters, MO

Updated: 3:33 PM CDT

Temperature: 68.6 °F Dew Point: 65 °F Humidity: 86% Wind: East at 1.0 mph Pressure: 29.96 in Hourly Precipitation: 0.03 in Heat Index: - Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 3:30 PM CDT

Temperature: 70.5 °F Dew Point: 65 °F Humidity: 84% Wind: South at 6.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Historic Saint Charles, Saint Charles, MO

Updated: 3:30 PM CDT

Temperature: 69.0 °F Dew Point: 65 °F Humidity: 87% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.01 in Heat Index: - Graphs

Location: Lindenwood, St. Charles, MO

Updated: 3:33 PM CDT

Temperature: 67.9 °F Dew Point: 65 °F Humidity: 90% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 3:33 PM CDT

Temperature: 70.9 °F Dew Point: 66 °F Humidity: 84% Wind: NNE at 4.6 mph Pressure: 29.95 in Hourly Precipitation: 0.04 in Heat Index: 70 °F Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 3:33 PM CDT

Temperature: 71.2 °F Dew Point: 64 °F Humidity: 78% Wind: South at 7.4 mph Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: St. Peters, St. Peters, MO

Updated: 3:31 PM CDT

Temperature: 71.7 °F Dew Point: 66 °F Humidity: 83% Wind: SW at 3.0 mph Pressure: 29.91 in Hourly Precipitation: 0.03 in Heat Index: 71 °F Graphs

Location: Maryland Heights, MO

Updated: 3:32 PM CDT

Temperature: 70.3 °F Dew Point: 66 °F Humidity: 85% Wind: SSE at 1.0 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 3:32 PM CDT

Temperature: 70.0 °F Dew Point: 66 °F Humidity: 86% Wind: SE at 3.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Creve Coeur, St. Louis, MO

Updated: 3:33 PM CDT

Temperature: 70.7 °F Dew Point: 70 °F Humidity: 97% Wind: SSE at 2.9 mph Pressure: 29.56 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 3:33 PM CDT

Temperature: 69.9 °F Dew Point: 65 °F Humidity: 84% Wind: SE at 8.0 mph Pressure: 29.91 in Hourly Precipitation: 0.03 in Heat Index: - Graphs

Location: Harmony Ridge, Cottleville, MO

Updated: 3:26 PM CDT

Temperature: 71.8 °F Dew Point: 64 °F Humidity: 76% Wind: SE at 3.7 mph Pressure: 29.83 in Hourly Precipitation: - Heat Index: 73 °F Graphs

Location: Whispering Hills, Creve Coeur, MO

Updated: 3:34 PM CDT

Temperature: 69.5 °F Dew Point: 64 °F Humidity: 84% Wind: SSE at 2.0 mph Pressure: 29.93 in Hourly Precipitation: 0.01 in Heat Index: - Graphs

Location: Maryland Heights, St Louis, MO

Updated: 3:21 PM CDT

Temperature: 68.9 °F Dew Point: 64 °F Humidity: 83% Wind: ESE at 10.0 mph Pressure: 29.29 in Hourly Precipitation: 0.01 in Heat Index: - Graphs

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

Updated: 3:22 PM CDT

Temperature: 67.7 °F Dew Point: 61 °F Humidity: 80% Wind: ESE at 5.0 mph Pressure: 29.92 in Hourly Precipitation: 0.01 in Heat Index: - Graphs

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

Updated: 3:33 PM CDT

Temperature: 70.3 °F Dew Point: 67 °F Humidity: 89% Wind: Calm Pressure: 30.12 in Hourly Precipitation: 0.06 in Heat Index: - Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 3:30 PM CDT

Temperature: 73.9 °F Dew Point: 60 °F Humidity: 62% Wind: SSE at 13.0 mph Pressure: 29.82 in Hourly Precipitation: 0.04 in Heat Index: 77 °F Graphs

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

Updated: 3:29 PM CDT

Temperature: 70.0 °F Dew Point: 62 °F Humidity: 77% Wind: SSE at 4.7 mph Pressure: 29.87 in Hourly Precipitation: - Heat Index: - Graphs

Location: Ladue Meadows, Creve Coeur, MO

Updated: 3:33 PM CDT

Temperature: 69.3 °F Dew Point: 63 °F Humidity: 81% Wind: ESE at 2.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Riverwood Place, Florissant, MO

Updated: 3:33 PM CDT

Temperature: 70.5 °F Dew Point: 65 °F Humidity: 84% Wind: SSW at 7.0 mph Pressure: 29.93 in Hourly Precipitation: 0.01 in Heat Index: - Graphs

Location: Piggy's BBQ, OFallon, MO

Updated: 3:29 PM CDT

Temperature: 70.6 °F Dew Point: 65 °F Humidity: 83% Wind: South at 8.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 70 °F Graphs

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

Updated: 3:33 PM CDT

Temperature: 68.3 °F Dew Point: 64 °F Humidity: 87% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.02 in Heat Index: - Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 3:33 PM CDT

Temperature: 71.3 °F Dew Point: 66 °F Humidity: 84% Wind: SE at 4.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 70 °F Graphs

Location: APRSWXNET Ladue MO US, Saint Louis, MO

Updated: 2:38 PM CDT

Temperature: 70 °F Dew Point: 63 °F Humidity: 79% Wind: SE at 1 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Twin Chimneys, O'Fallon, MO

Updated: 3:30 PM CDT

Temperature: 71.6 °F Dew Point: 65 °F Humidity: 80% Wind: NNE at 6.0 mph Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: The Boardwalk at WingHaven, OFallon, MO

Updated: 3:16 PM CDT

Temperature: 69.1 °F Dew Point: 65 °F Humidity: 87% Wind: SE at 4.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Hyland Green, O'Fallon, MO

Updated: 3:33 PM CDT

Temperature: 72.1 °F Dew Point: 67 °F Humidity: 84% Wind: South at 2.2 mph Pressure: 29.54 in Hourly Precipitation: 0.00 in Heat Index: 71 °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 
1255 PM CDT Fri Jul 25 2014 


Update: 
issued at 950 am CDT Fri Jul 25 2014 


Complex of thunderstorms and rain continues to maintain itself rather well on its 
backside over northeast MO and eastern IA, where lo level jet and 
better instability are feeding it. An isolated threat for large 
hail exists, but should decrease heading deeper into the morning. 
Overall health of thunderstorms and rain complex should also begin to fail as we 
head into the afternoon hours, with strengthening cap of warm air 
to the west and weakening lo level jet. This rain should have a 
somewhat easier time of advecting in Illinois versus MO and updated the 
forecast accordingly, although will no doubt need to tweak 
expected coverage over the next couple hours. 


Also adjusted temps further down in IL, where readings should stay 
below 80f, but enough recovery expected in the west and south to 
maintain previous forecast. 


Tes 


&& 


Short term: (through late this afternoon) 
issued at 330 am CDT Fri Jul 25 2014 


Convective trends and the extent of pops are the biggest forecast 
challenge today. Thunderstorms have blossomed within the last 
several hours across central Iowa at the terminus of a Stout 
southwesterly llj, and along the eastern periphery of elevated 
instability, deeper moisture and steep mid level lapse rates. 
Short range guidance shows the low level jet slowly veering this morning, 
providing favorable moisture transport and forcing as the flow 
aloft and northwestely deep layer shear steer the activity east 
and southeastward. The hrrr runs since 01z have been very emphatic 
supporting this scenario bringing showers and thunderstorms into 
northeast Missouri and west central Illinois. I have increased 
pops into the likely range in this area tapered to slight chances 
just north of Interstate 70. Believe that most of this activity 
will be east of the MS river by early afternoon and exiting the 
County Warning Area shortly thereafter. This activity will likely delay/impeed the 
northward retreat of the warm front, however in central MO there 
should be no issue where highs will be around 90. 


Glass 


Long term: (tonight through thursday) 
issued at 330 am CDT Fri Jul 25 2014 


The warm front should have exited the entire County Warning Area by early evening 
while the upstream cold frontal system will be slowly advancing 
and stretching from the upper MS valley into the Central Plains. 
High heights aloft and warm mid level temperatures should suppress 
any surface-based storm development within the large warm sector 
spanning the cwa, however the area will remain subject to an 
elevated shower and thunderstorm threat. While there is no defined 
focus for thunderstorms, a westerly low level jet will be poised across the 
area in conjunction with steep mid level lapse rates and good 
elevated instability supporting a least a chance pop. These same 
unfocused conditions will exist on Saturday morning. The set-up 
should improve on Saturday afternoon. Strong surface heating 
should yield temperatures well into the 90s with dew points in the 
70s. This will result in afternoon heat indices in the 100-104 degree 
range, just below advisory criteria. We will need to monitor this 
closely as just a bit higher dew points and/or temperatures and a 
heat advisory will be warranted. The aforementioned conditions along 
with the presence of steep mid level lapse rates will yield very 
unstable conditions during the afternoon/evening. There are 
indications that the combo of heating and a disturbance in the 
west northwest flow aloft should sufficiently weaken the cap 
allowing for robust thunderstorm development along the west-east 
oriented front stretching in the vicinity of far northern MO 
through central Illinois into the Ohio Valley. How far west development 
occurs is uncertain but height falls/cooling aloft on Saturday 
night could aid this process. Deep layer shear and instability is 
quite favorable for organized severe with damaging winds the most 
apparent severe threat at this time. I have some low pops on 
Sunday ahead of the advancing front, but the overall threat of 
precipitation will be lower as compared to the Saturday night. 
Cooler and drier air will advect in earnest into the area on Sunday 
night with a large surface high settling into the nation's 
midsection on Monday. An unseasonably deep upper trof over eastern 
noam through the first part of next week will keep the large 
surface high in control and allow for another period of below 
average temperatures as we exit July and head into August. 


Glass 


&& 


Aviation: (for the 18z tafs through 18z Saturday afternoon) 
issued at 1255 PM CDT Fri Jul 25 2014 


VFR conditions are expected to prevail outside of thunderstorms and rain at the taf 
sites thru the valid period. Thunderstorms and rain expected to weaken as it moves 
into stl Metro with some activity expected to edge into the 
northern vicinities of sus and stl before final anticipated 
dissolution. The thunderstorms and rain is in the process of exiting uin now. After 
this, very iffy on thunderstorms and rain chances heading into tonight and thru the 
first part of Saturday...enough to preclude mention in tafs. 
Otherwise, look for veering wind directions from southeast to SW. 


Specifics for kstl: VFR thru the period outside of thunderstorms and rain with 
veering southeast winds to SW by Saturday. Current thunderstorms and rain activity still 
expected to fall apart before reaching the Aerodrome, but believe 
something will edge the northern vicinity before doing so. 


Tes 


&& 


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


$$ 


Weather forecast office lsx 



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