Arnold, Missouri Weather Conditions

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Current Conditions

  • 75°
  • Clear
  • Wind: Variable 7 mph
  • Humidity: 51%
  • Visibility: 10.0 miles
  • Dew Point: 56°
  • Pressure: 30.04 in. -

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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
Clear
Clear
Clear
Clear
Clear
Clear
72°
68°
63°
57°
54°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Thursday
  • Partly Cloudy
  • High: 75 °
  • Low: 54 °
  • Partly Cloudy
  • Friday
  • Partly Cloudy
  • High: 77 °
  • Low: 55 °
  • Partly Cloudy
  • Saturday
  • Chance of a Thunderstorm
  • High: 86 °
  • Low: 66 °
  • Chance of a Thunderstorm
  • Sunday
  • Partly Cloudy
  • High: 79 °
  • Low: 52 °
  • Partly Cloudy
  • Monday
  • Partly Cloudy
  • High: 73 °
  • Low: 48 °
  • Partly Cloudy

Forecast for Arnold, Missouri

Updated: 4:00 PM CDT on September 18, 2014

  • Thursday

    Partly cloudy. High of 75F. Winds from the NNW at 5 to 10 mph shifting to the South in the afternoon.

  • Thursday Night

    Partly cloudy in the evening, then clear. Low of 54F. Winds less than 5 mph.

  • Friday

    Partly cloudy. High of 77F. Winds from the SE at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Fog overnight. Low of 55F. Winds from the SSE at 5 to 10 mph.

  • Saturday

    Overcast with a chance of a thunderstorm and a chance of rain in the afternoon. High of 86F. Winds from the SSW at 5 to 10 mph. Chance of rain 20%.

  • Saturday Night

    Partly cloudy with a chance of a thunderstorm and a chance of rain, then a chance of a thunderstorm and rain after midnight. Fog overnight. Low of 66F. Winds from the WSW at 5 to 10 mph. Chance of rain 60% with rainfall amounts near 0.2 in. possible.

  • Sunday

    Partly cloudy. Fog early. High of 79F. Winds from the NNW at 5 to 10 mph.

  • Sunday Night

    Clear. Low of 52F. Winds from the North at 5 to 10 mph.

  • Monday

    Partly cloudy. High of 73F. Winds less than 5 mph.

  • Monday Night

    Partly cloudy. Low of 48F. Winds less than 5 mph.

  • Tuesday

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

  • Tuesday Night

    Clear. Fog overnight. Low of 50F. Winds from the East at 5 to 10 mph.

  • Wednesday

    Clear. High of 77F. Winds from the East at 5 to 10 mph.

  • Wednesday Night

    Partly cloudy. Fog overnight. Low of 50F. Winds from the East at 5 to 10 mph.

  • Thursday

    Clear. High of 77F. Winds from the ESE at 5 to 10 mph.

  • Thursday Night

    Clear. Fog overnight. Low of 50F. Winds from the SE at 5 to 10 mph.

  • Friday

    Partly cloudy. High of 75F. Winds from the SE at 5 to 10 mph.

  • Friday Night

    Clear. Fog overnight. Low of 54F. Winds from the SE at 5 to 10 mph.

  • Saturday

    Partly cloudy. High of 73F. Winds less than 5 mph.

  • Saturday Night

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

  • Sunday

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

  • Sunday Night

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

  • Monday

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

  • Monday Night

    Clear. Low of 57F. Winds from the ESE at 5 to 10 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: ARNOLD, Arnold, MO

Updated: 2:40 PM CDT

Temperature: 73.0 °F Dew Point: - Humidity: 51% Wind: North at - Pressure: 29.36 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: Arnold, MO

Updated: 2:28 PM CDT

Temperature: 73.9 °F Dew Point: 63 °F Humidity: 69% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Arnold, Arnold, MO

Updated: 2:43 PM CDT

Temperature: 72.2 °F Dew Point: 61 °F Humidity: 68% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: summerfield, Imperial, MO

Updated: 2:43 PM CDT

Temperature: 75.7 °F Dew Point: 59 °F Humidity: 56% Wind: SE at 1.1 mph Pressure: 29.77 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Saint Louis County, Saint Louis County, MO

Updated: 2:40 PM CDT

Temperature: 73.1 °F Dew Point: 59 °F Humidity: 61% Wind: East at 2.0 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Imperial, MO

Updated: 2:43 PM CDT

Temperature: 70.0 °F Dew Point: 59 °F Humidity: 69% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Oakville, Providence Pointe, Oakville, MO

Updated: 2:43 PM CDT

Temperature: 74.6 °F Dew Point: 58 °F Humidity: 56% Wind: SE at 1.0 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Imperial - Wellington Subdivision, Imperial, MO

Updated: 2:42 PM CDT

Temperature: 76.2 °F Dew Point: 62 °F Humidity: 62% Wind: East at 8.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Oakville, Cliffwood Trail, Oakville, MO

Updated: 2:43 PM CDT

Temperature: 74.3 °F Dew Point: 55 °F Humidity: 51% Wind: ENE at 1.1 mph Pressure: 30.15 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Oakville, Cardinal Creek Subd, Oakville, MO

Updated: 2:43 PM CDT

Temperature: 74.6 °F Dew Point: 61 °F Humidity: 62% Wind: East at 4.0 mph Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Christopher Winds, Oakville, MO

Updated: 2:43 PM CDT

Temperature: 73.0 °F Dew Point: 60 °F Humidity: 65% Wind: North at 2.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Rock Creek Terrace, High Ridge, MO

Updated: 2:43 PM CDT

Temperature: 74.6 °F Dew Point: 61 °F Humidity: 63% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: South St. Louis County, St. Louis, MO

Updated: 2:39 PM CDT

Temperature: 72.3 °F Dew Point: - Humidity: 56% Wind: SE at 3.0 mph Pressure: 29.37 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: San Luis Trails, Fenton, MO

Updated: 2:43 PM CDT

Temperature: 72.7 °F Dew Point: 56 °F Humidity: 55% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: APRSWXNET Mehlville MO US, Saint Louis, MO

Updated: 2:08 PM CDT

Temperature: 70 °F Dew Point: 59 °F Humidity: 68% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: High Ridge Fire District House #1, High Ridge, MO

Updated: 2:41 PM CDT

Temperature: 73.6 °F Dew Point: 58 °F Humidity: 59% Wind: ESE at 9.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: St. Louis, MO

Updated: 2:43 PM CDT

Temperature: 75.4 °F Dew Point: 60 °F Humidity: 58% Wind: WNW at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Hawkins/Smizer Mill, Fenton, MO

Updated: 2:43 PM CDT

Temperature: 79.6 °F Dew Point: 64 °F Humidity: 58% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 81 °F Graphs

Location: Sunset Hills, St Louis, MO

Updated: 2:31 PM CDT

Temperature: 72.3 °F Dew Point: 59 °F Humidity: 63% Wind: Calm Pressure: 30.01 in Hourly Precipitation: - Heat Index: 76 °F Graphs

Location: Crestwood, Crestwood, MO

Updated: 2:41 PM CDT

Temperature: 73.4 °F Dew Point: 59 °F Humidity: 60% Wind: East at 1.7 mph Pressure: 29.73 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: South County, Affton, MO

Updated: 2:43 PM CDT

Temperature: 73.3 °F Dew Point: 62 °F Humidity: 68% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Olde Mill Estates, Byrnes Mill, MO

Updated: 2:43 PM CDT

Temperature: 73.9 °F Dew Point: 56 °F Humidity: 54% Wind: North at 10.7 mph Pressure: 30.11 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: MesoWest I-255 / IL-3 @ Columbia IL US ILDOT, Columbia, IL

Updated: 1:55 PM CDT

Temperature: 73 °F Dew Point: 56 °F Humidity: 54% Wind: North at 8 mph Pressure: - Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Big Bend and I-270, Kirkwood, MO

Updated: 2:40 PM CDT

Temperature: 72.8 °F Dew Point: 59 °F Humidity: 62% Wind: ENE at 1.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Gedern Village, Columbia, IL

Updated: 2:42 PM CDT

Temperature: 74.1 °F Dew Point: 58 °F Humidity: 58% Wind: NE at 2.0 mph Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Crest Ave. Kirkwood MO, St. Louis, MO

Updated: 2:43 PM CDT

Temperature: 78.8 °F Dew Point: 59 °F Humidity: 51% Wind: SE at 1.7 mph Pressure: 29.98 in Hourly Precipitation: - Heat Index: 80 °F Graphs

Location: East Madison, Kirkwood, MO, Kirkwood, MO

Updated: 2:42 PM CDT

Temperature: 73.2 °F Dew Point: 58 °F Humidity: 58% Wind: ENE at 2.9 mph Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: On The Bluffs, Waterloo, IL

Updated: 2:43 PM CDT

Temperature: 76.1 °F Dew Point: 59 °F Humidity: 56% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: BROADWAY (South), St. Louis, MO

Updated: 2:40 PM CDT

Temperature: 72.9 °F Dew Point: - Humidity: 49% Wind: North at - Pressure: 29.44 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: Sandy Creek Winery, Pevely, MO

Updated: 2:38 PM CDT

Temperature: 73.8 °F Dew Point: 61 °F Humidity: 64% Wind: WNW at 3.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Essex and Geyer, St. Louis, MO

Updated: 2:32 PM CDT

Temperature: 73.9 °F Dew Point: 59 °F Humidity: 60% Wind: WNW at 1.7 mph Pressure: 29.83 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: Twin Oaks, Twin Oaks, MO

Updated: 2:28 PM CDT

Temperature: 73.6 °F Dew Point: 57 °F Humidity: 57% Wind: SSE at 2.7 mph Pressure: 29.91 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: Herculaneum, Mott Street, Herculaneum, MO

Updated: 2:40 PM CDT

Temperature: 72.7 °F Dew Point: - Humidity: - Wind: North at - Pressure: 29.64 in Hourly Precipitation: - Heat Index: - Graphs

Location: Webster Groves, Webster Groves, MO

Updated: 2:40 PM CDT

Temperature: 73.6 °F Dew Point: 49 °F Humidity: 42% Wind: NW at 5.0 mph Pressure: 30.06 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Manchester, MO, Manchester, MO

Updated: 2:36 PM CDT

Temperature: 71.4 °F Dew Point: 59 °F Humidity: 64% Wind: Calm Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: Arbor Valley, Ballwin, MO

Updated: 2:43 PM CDT

Temperature: 74.1 °F Dew Point: 58 °F Humidity: 58% Wind: SSE at 1.0 mph Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: 77 °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 
1220 PM CDT Thu Sep 18 2014 


Short term: (through late this afternoon) 
issued at 347 am CDT Thu Sep 18 2014 


Passage of weak shortwave overnight is going to give the surface 
ridge extending from the upper Great Lakes into the mid-mississipi 
valley a bit of a southwest nudge today. The resultant 
intensification of the surface high will mean an increasing easterly 
low level flow in the lowest 5kft of the ams, which should advect 
drier air from S Illinois into our area. Impacts of this dry air can be 
seen in ceiling trends indicate that lower stratus is having a 
difficult time forming over S Illinois. 


Low cloud infrared imagery early this morning is also showing the impacts 
of this drier air, as northern edge of cloud deck is remaining 
quasi-stationary from just south of ppq to near Effingham/1h2. 
However, ground fog is forming in the clear skies on the northern 
fringes of this cloud deck, and after checking with several County 
sheriffs in NE MO/W central IL, will be issuing a dense fog advisory 
til 9am this morning for areas along and north of a Paris-Bowling 
Green line. 


With the increasing easterly low level flow, believe there should be 
a gradual decrease in clouds from west to east during the day. 
Given low cloud tendencies over the County Warning Area the last few weeks I hate to 
be too optimistic, but aforementioned trends as well as good 
agreement in the models regarding the low level moisture profile 
seem to indicate this clearing trend. However, the emphasis will be 
on "gradual", as we will also be contending with some high level 
cloudiness spreading east from the convection over eastern Kansas/SW MO, 
at least during the morning. 


As far as showers and thunderstorm threat is concerned...axis of 
convection is gradually sagging south as redevelopment continues on 
the west/south side of the rain-cooled boundary. With this boundary 
remaining active, the shower and thunderstorm threat should remain 
southwest of our County Warning Area. 


Truett 


Long term: (tonight through wednesday) 
issued at 347 am CDT Thu Sep 18 2014 


A ridge of high pressure extending from the Great Lakes region 
southwest into eastern MO should keep any precipitation west of our 
forecast area tonight. Warmer temperatures can be expected on 
Friday as an upper level ridge shifts eastward into MO, and surface 
winds become southerly on the western periphery of the surface ridge 
extending southwest into southeastern MO. The chance of convection 
will return Saturday afternoon and night as the upper level ridge 
flattens as an upper level trough deepens over the northern plains 
and Great Lakes region. As the trough deepens it will send a cold 
front southeastward through our forecast area Saturday night and 
Sunday morning. At least scattered showers/storms are expected 
along this front. It appears that most of the precipitation will 
shift south of our forecast area by Sunday afternoon as a strong 
surface ridge builds into the region behind the cold front with 
cooler and drier air filtering southeastward into our area. Both 
the GFS and European model (ecmwf) models drop the 8 degree c 850 mb isotherm 
southward to stl by 12z Monday. A dry and cool period of weather is 
expected for the remainder of the extended forecast with 
northwesterly upper level flow and as the surface ridge moves slowly 
eastward through the region. 


Gks 


&& 


Aviation: (for the 18z tafs through 18z Friday afternoon) 
issued at 1207 PM CDT Thu Sep 18 2014 


Stratus breaking up as drier air advects into the region from the 
east and is aided by September sunshine. Will see this trend 
continue into the afternoon with most locations becoming clear by 
evening. Some concern for valley fog tonight and have kept some 
MVFR visibility at a few of the favored terminals. Otherwise, 
light east/southeast wind to continue. 


Specifics for kstl: 


Stratus breaking up and should see sky clear by this evening. 
Light east wind will become southeast on Friday. 


Cvking 


&& 


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


$$ 


Weather forecast office lsx 



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