Herculaneum, Missouri Weather Conditions

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Current Conditions

  • 61°
  • Clear
  • Wind: South 4 mph
  • Humidity: 87%
  • Visibility: 10.0 miles
  • Dew Point: 57°
  • Pressure: 30.02 in. -

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Next 12 Hours

4  am
7  am
10  am
1  pm
4  pm
Clear
Clear
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Mostly Cloudy
Clear
Clear
Clear
Clear
63°
59°
75°
81°
84°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Partly Cloudy
  • High: 84 °
  • Low: 68 °
  • Partly Cloudy
  • Saturday
  • Chance of a Thunderstorm
  • High: 99 °
  • Low: 73 °
  • Chance of T-Storms
  • Sunday
  • Chance of a Thunderstorm
  • High: 93 °
  • Low: 63 °
  • Chance of T-Storms
  • Monday
  • Clear
  • High: 81 °
  • Low: 57 °
  • Clear
  • Tuesday
  • Partly Cloudy
  • High: 81 °
  • Low: 54 °
  • Partly Cloudy

Forecast for Herculaneum, Missouri

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

  • Friday

    Mostly cloudy in the morning, then clear. High of 84F. Winds from the SSE at 5 to 15 mph.

  • Friday Night

    Mostly cloudy. Low of 68F. Winds from the South at 5 to 15 mph.

  • Saturday

    Partly cloudy with a chance of a thunderstorm and a chance of rain in the morning, then overcast 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 30%.

  • Saturday Night

    Overcast with a chance of a thunderstorm and a chance of rain. Low of 73F. 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 93F. Winds from the WNW at 10 to 15 mph. Chance of rain 30%.

  • Sunday Night

    Clear. Low of 63F. 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. Fog overnight. Low of 57F. Winds from the North at 5 to 10 mph.

  • Tuesday

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

  • Tuesday Night

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

  • Wednesday

    Partly cloudy. High of 82F. Winds less than 5 mph.

  • Wednesday Night

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

  • Thursday

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

  • Thursday Night

    Clear with a chance of a thunderstorm. Low of 57F. Winds less than 5 mph. Chance of rain 40%.

  • Friday

    Clear 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 63F. Winds less than 5 mph. Chance of rain 50%.

  • Sunday

    Partly cloudy with a chance of a thunderstorm. High of 81F. Winds less than 5 mph. Chance of rain 50%.

  • 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: Sandy Creek Winery, Pevely, MO

Updated: 3:46 AM CDT

Temperature: 56.5 °F Dew Point: 56 °F Humidity: 98% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Graphs

Location: MesoWest MAEYS1 IL US UPR, Maeystown, IL

Updated: 2:35 AM CDT

Temperature: 57 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: Imperial - Wellington Subdivision, Imperial, MO

Updated: 3:57 AM CDT

Temperature: 58.8 °F Dew Point: 57 °F Humidity: 94% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Graphs

Location: On The Bluffs, Waterloo, IL

Updated: 3:57 AM CDT

Temperature: 55.1 °F Dew Point: 54 °F Humidity: 97% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Graphs

Location: summerfield, Imperial, MO

Updated: 3:56 AM CDT

Temperature: 56.1 °F Dew Point: 56 °F Humidity: 99% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Graphs

Location: Imperial, MO

Updated: 3:57 AM CDT

Temperature: 58.8 °F Dew Point: 52 °F Humidity: 77% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Graphs

Location: Wynfield Terrace, St. Louis, MO

Updated: 3:57 AM CDT

Temperature: 60.6 °F Dew Point: 57 °F Humidity: 89% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Graphs

Location: Arnold, MO

Updated: 3:55 AM CDT

Temperature: 58.0 °F Dew Point: 57 °F Humidity: 96% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Graphs

Location: Arnold, Arnold, MO

Updated: 3:44 AM CDT

Temperature: 60.0 °F Dew Point: 58 °F Humidity: 93% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Graphs

Location: Oakville, Cliffwood Trail, Oakville, MO

Updated: 3:57 AM CDT

Temperature: 61.3 °F Dew Point: 58 °F Humidity: 90% Wind: Calm Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: Rock Creek Terrace, High Ridge, MO

Updated: 3:57 AM CDT

Temperature: 60.4 °F Dew Point: 56 °F Humidity: 86% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Graphs

Location: Hardy Acres / AA9UC, Waterloo, IL

Updated: 3:56 AM CDT

Temperature: 62.4 °F Dew Point: 37 °F Humidity: 39% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Graphs

Location: Oakville, Cardinal Creek Subd, Oakville, MO

Updated: 3:57 AM CDT

Temperature: 61.9 °F Dew Point: 59 °F Humidity: 91% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Graphs

Location: Saint Louis County, Saint Louis County, MO

Updated: 3:56 AM CDT

Temperature: 59.5 °F Dew Point: 58 °F Humidity: 93% Wind: Calm Pressure: 30.01 in Hourly Precipitation: 0.00 in Graphs

Location: Ste Genevieve county, Festus, MO

Updated: 3:56 AM CDT

Temperature: 58.1 °F Dew Point: - Humidity: - Wind: North at - Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: Oakville, Providence Pointe, Oakville, MO

Updated: 3:57 AM CDT

Temperature: 61.3 °F Dew Point: 58 °F Humidity: 89% Wind: SE at 1.0 mph Pressure: 30.02 in Hourly Precipitation: 0.00 in Graphs

Location: Olde Mill Estates, Byrnes Mill, MO

Updated: 3:57 AM CDT

Temperature: 59.2 °F Dew Point: 59 °F Humidity: 99% Wind: Calm Pressure: 30.10 in Hourly Precipitation: 0.00 in Graphs

Location: Devall's Backyard, Waterloo, IL

Updated: 3:49 AM CDT

Temperature: 59.6 °F Dew Point: 58 °F Humidity: 95% Wind: Calm Pressure: 30.03 in Hourly Precipitation: - Graphs

Location: Gedern Village, Columbia, IL

Updated: 3:57 AM CDT

Temperature: 60.4 °F Dew Point: 58 °F Humidity: 91% Wind: Calm Pressure: 30.02 in Hourly Precipitation: 0.00 in Graphs

Location: San Luis Trails, Fenton, MO

Updated: 3:57 AM CDT

Temperature: 59.2 °F Dew Point: 54 °F Humidity: 84% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Graphs

Location: Hawkins/Smizer Mill, Fenton, MO

Updated: 3:57 AM CDT

Temperature: 60.2 °F Dew Point: 57 °F Humidity: 89% Wind: Calm Pressure: 29.96 in Hourly Precipitation: 0.00 in Graphs

Location: St. Joseph Hill, Pacific, MO

Updated: 3:55 AM CDT

Temperature: 55.5 °F Dew Point: 54 °F Humidity: 94% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Graphs

Location: Gerry's Pool, Prairie Du Rocher, IL

Updated: 3:50 AM CDT

Temperature: 59.0 °F Dew Point: 56 °F Humidity: 91% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Graphs

Location: South County, Affton, MO

Updated: 3:57 AM CDT

Temperature: 61.4 °F Dew Point: 57 °F Humidity: 86% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Graphs

Location: Sunset Hills, St Louis, MO

Updated: 3:42 AM CDT

Temperature: 65.6 °F Dew Point: 58 °F Humidity: 77% Wind: Calm Pressure: 29.99 in Hourly Precipitation: - Graphs

Location: Crestwood, Crestwood, MO

Updated: 3:43 AM CDT

Temperature: 59.2 °F Dew Point: 55 °F Humidity: 85% Wind: Calm Pressure: 29.74 in Hourly Precipitation: - Graphs

Location: MesoWest KIDD1 IL US UPR, Prairie Du Rocher, IL

Updated: 2:55 AM CDT

Temperature: 59 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in 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 am CDT Fri Jul 25 2014 


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 thuunderstorms, 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 ernest 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 06z tafs through 06z Friday night) 
issued at 1111 PM CDT Thu Jul 24 2014 


VFR fcst with the only real concern being new convection fcst to 
dvlp around 8-9z across cntrl Iowa out ahead of the ongoing 
convection across ern Nebraska. This new activity is fcst to drop southeast 
during the early mrng hrs making it as far southeast as NE MO and west cntrl 
Illinois by daybreak. There is some question as to how far southeast this 
precip will be able to push before dssptng...but given how far the 
precip from earlier this evng made it...wouldn't be at all 
surprised if it made it all the way into the stl Metro area by 
17-18z. Given the uncertainty in intensity...coverage and timing have 
left the Metro sites dry for now. After this activity passes southeast of 
the terminals...expect srly winds with just some left over 
mid/high clouds 


Specifics for kstl: 


VFR fcst with the possibility of precip mvng into the terminal around 
noon. Convection is fcst to dvlp across Iowa after midnight and then 
track southeast thru the mrng possibly reaching the terminal by very late 
mrng. There is still some question as to whether the precip will 
hold together that long...hence have a dry fcst attm. This is 
something that will obviously need to be monitored for future 
updates. Otherwise...expect srly winds with mid/high level 
cloudiness. 


2% 


&& 


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


$$ 


Weather forecast office lsx 



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