Collinsville, Illinois Weather Conditions

Severe Weather Alerts

National Weather Service:

Excessive Heat Warning View All Alerts

Your Weather

To update your location please enter your ZIP code, city, state, airport code or country in the field below. Weather by E-mail: Forecast storm alerts. Weather E-Mail Alert Sign Up »

Current Conditions

  • 93°
  • Clear
  • Wind: SSW 9 mph
  • Humidity: 54%
  • Visibility: 10.0 miles
  • Dew Point: 74°
  • Pressure: 29.94 in. -
  • Heat Index: 103

Select a Section

Click a section below for more information.

Next 12 Hours

4  pm
7  pm
10  pm
1  am
4  am
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
95°
90°
86°
79°
79°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Thursday
  • Partly Cloudy
  • High: 97 °
  • Low: 75 °
  • Partly Cloudy
  • Friday
  • Clear
  • High: 93 °
  • Low: 75 °
  • Clear
  • Saturday
  • Clear
  • High: 97 °
  • Low: 73 °
  • Clear
  • Sunday
  • Clear
  • High: 99 °
  • Low: 73 °
  • Clear
  • Monday
  • Partly Cloudy
  • High: 95 °
  • Low: 75 °
  • Partly Cloudy

Forecast for Collinsville, Illinois

Updated: 4:00 PM CDT on August 21, 2014

Excessive heat warning in effect until 7 PM CDT Sunday...
  • Thursday

    Partly cloudy. High of 97F with a heat index of 104F. Winds from the SSW at 5 to 10 mph.

  • Thursday Night

    Clear. Low of 75F. Winds from the SSW at 5 to 10 mph.

  • Friday

    Clear in the morning, then partly cloudy. High of 93F with a heat index of 102F. Winds from the SW at 5 to 10 mph.

  • Friday Night

    Clear. Low of 75F. Winds from the SW at 5 to 10 mph.

  • Saturday

    Clear. High of 97F with a heat index of 102F. Winds less than 5 mph.

  • Saturday Night

    Partly cloudy in the evening, then clear. Low of 73F. Winds from the SSE at 5 to 10 mph.

  • Sunday

    Clear. High of 99F with a heat index of 104F. Winds less than 5 mph.

  • Sunday Night

    Clear. Low of 73F. Winds from the ESE at 5 to 10 mph.

  • Monday

    Partly cloudy. High of 95F. Winds less than 5 mph.

  • Monday Night

    Partly cloudy with a chance of a thunderstorm. Low of 75F. Winds from the SE at 5 to 10 mph. Chance of rain 20%.

  • Tuesday

    Clear with a chance of a thunderstorm. High of 97F. Winds from the South at 5 to 10 mph. Chance of rain 40%.

  • Tuesday Night

    Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 73F. Winds from the SSE at 5 to 10 mph. Chance of rain 50% with rainfall amounts near 0.2 in. possible.

  • Wednesday

    Partly cloudy with a chance of a thunderstorm. High of 88F with a heat index of 95F. Winds from the South at 5 to 15 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Wednesday Night

    Overcast with a chance of a thunderstorm. Fog overnight. Low of 70F. Winds from the SSW at 5 to 10 mph. Chance of rain 40% with rainfall amounts near 0.3 in. possible.

  • Thursday

    Partly cloudy with a chance of a thunderstorm. High of 81F. Winds from the WNW at 5 to 10 mph. Chance of rain 50%.

  • Thursday Night

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

  • Friday

    Clear. High of 68F. Winds less than 5 mph.

  • Friday Night

    Clear. Fog overnight. Low of 63F. Winds less than 5 mph.

  • Saturday

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

  • Saturday Night

    Clear. Low of 68F. Winds from the SSE at 5 to 10 mph.

  • Sunday

    Clear. High of 84F. Winds from the South at 5 to 10 mph.

  • Sunday Night

    Clear. Low of 68F. Winds from the SE at 5 to 10 mph.

  • Monday

    Clear. High of 82F. Winds from the SSE at 5 to 10 mph.

  • Monday Night

    Clear. Low of 68F. Winds from the SSE at 5 to 10 mph.

Severe Weather Alert Descriptions

 Excessive Heat Warning  Statement as of 3:44 am CDT on August 21, 2014


... Excessive heat warning remains in effect until 7 PM CDT
Sunday...

* timing... dangerous levels of heat and humidity will continue
for the rest of the week and into the upcoming weekend.

* Heat index values... up to 107 due to temperatures in the 90s
and dewpoints in the lower 70s.

* Impacts... the combination of hot temperatures and high
humidity will lead to an increased risk of heat-related stress
and illness. The very Young... the elderly... those without air
conditioning... and those participating in strenuous outdoor
activities will be the most susceptible. Also... car interiors
will reach lethal temperatures in a matter of minutes. Beat
the heat... check the backseat! Never leave children or pets
unattended in a vehicle... not even for a minute.

Precautionary/preparedness actions...

Take extra precautions if you work or spend time outside. When
possible... reschedule strenuous activities to the early morning
or evening. Know the signs and symptoms of heat exhaustion and
heat stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work... the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency. Call 9-1-1 immediately.

People in the St. Louis metropolitan area can get information
about cooling centers or energy assistance related to the
excessive heat by calling the United way of greater St. Louis at
800-427-4626... or if calling from a land line phone dial 2-1-1.
You can also call cool down St. Louis at 314-241-7668.






 Local Storm Report 



08/20/2014 0848 PM

Granite City, Madison County.

Thunderstorm wind gust m43 mph, reported by trained spotter.





Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Collinsville West, Collinsville, IL

Updated: 3:00 PM CDT

Temperature: 92.1 °F Dew Point: 76 °F Humidity: 59% Wind: SW at 7.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Rolling Meadows Dr, Maryville, IL

Updated: 3:00 PM CDT

Temperature: 89.2 °F Dew Point: 73 °F Humidity: 59% Wind: South at 1.1 mph Pressure: 29.32 in Hourly Precipitation: 0.00 in Heat Index: 97 °F Graphs

Location: Liberty Place, Troy, IL

Updated: 2:47 PM CDT

Temperature: 91.0 °F Dew Point: 78 °F Humidity: 65% Wind: SSE at 5.0 mph Pressure: 29.34 in Hourly Precipitation: 0.00 in Heat Index: 105 °F Graphs

Location: Nolan Creek, OFallon, IL

Updated: 2:58 PM CDT

Temperature: 93.5 °F Dew Point: 77 °F Humidity: 59% Wind: SW at 3.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 108 °F Graphs

Location: Don's Backyard, O'Fallon, IL

Updated: 2:59 PM CDT

Temperature: 93.2 °F Dew Point: 78 °F Humidity: 62% Wind: ENE at 3.8 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Heat Index: 109 °F Graphs

Location: New Goose, Fairview Heights, IL

Updated: 3:00 PM CDT

Temperature: 96.2 °F Dew Point: 80 °F Humidity: 59% Wind: SE at 2.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 116 °F Graphs

Location: Old Skewl, Fairview Heights, IL

Updated: 3:00 PM CDT

Temperature: 90.4 °F Dew Point: 74 °F Humidity: 58% Wind: SE at 3.6 mph Pressure: - Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: StormGrl2001, Fairview Heights, IL

Updated: 2:34 PM CDT

Temperature: 93.7 °F Dew Point: 79 °F Humidity: 62% Wind: SW at 7.8 mph Pressure: 29.87 in Hourly Precipitation: - Heat Index: 111 °F Graphs

Location: Prairie Crossing, OFallon, IL

Updated: 2:47 PM CDT

Temperature: 91.9 °F Dew Point: 76 °F Humidity: 59% Wind: WNW at 1.7 mph Pressure: 29.73 in Hourly Precipitation: - Heat Index: 104 °F Graphs

Location: Mallard Pointe, Troy, IL

Updated: 3:00 PM CDT

Temperature: 92.5 °F Dew Point: 77 °F Humidity: 60% Wind: South at 8.3 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 106 °F Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 2:55 PM CDT

Temperature: 96.1 °F Dew Point: 78 °F Humidity: 57% Wind: SSE at 1.7 mph Pressure: 29.91 in Hourly Precipitation: - Heat Index: 114 °F Graphs

Location: MesoWest NAMOK1 IL US UPR, Granite City, IL

Updated: 2:10 PM CDT

Temperature: 97 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 2:59 PM CDT

Temperature: 91.8 °F Dew Point: 78 °F Humidity: 65% Wind: SSW at 4.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 108 °F Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 2:55 PM CDT

Temperature: 87.5 °F Dew Point: 79 °F Humidity: 75% Wind: SSW at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Greg and Linsay's House, Swansea, IL

Updated: 3:00 PM CDT

Temperature: 92.1 °F Dew Point: 76 °F Humidity: 59% Wind: SW at 5.6 mph Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: North Horner Park, Lebanon, IL

Updated: 2:59 PM CDT

Temperature: 90.0 °F Dew Point: 78 °F Humidity: 69% Wind: South at 2.0 mph Pressure: 29.54 in Hourly Precipitation: 0.00 in Heat Index: 105 °F Graphs

Location: West End, Belleville, IL

Updated: 2:59 PM CDT

Temperature: 97.7 °F Dew Point: 46 °F Humidity: 35% Wind: SSW at 5.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: APRSWXNET Shiloh IL US, Belleville, IL

Updated: 2:03 PM CDT

Temperature: 91 °F Dew Point: 78 °F Humidity: 65% Wind: SSW at 5 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 105 °F Graphs

Location: St. Jacob, Il, St. Jacob, IL

Updated: 3:00 PM CDT

Temperature: 90.1 °F Dew Point: 77 °F Humidity: 65% Wind: SSE at 3.1 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 103 °F Graphs

Location: Belleville, IL, Belleville, IL

Updated: 3:00 PM CDT

Temperature: 99.1 °F Dew Point: 67 °F Humidity: 35% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Rosewood Heights, East Alton, IL

Updated: 2:59 PM CDT

Temperature: 93.6 °F Dew Point: 73 °F Humidity: 51% Wind: SSW at 1.0 mph Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 103 °F Graphs

Location: APRSWXNET East Alton IL US, Wood River, IL

Updated: 2:32 PM CDT

Temperature: 93 °F Dew Point: 73 °F Humidity: 52% Wind: SSW at 2 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Millstadt, Millstadt, IL

Updated: 3:00 PM CDT

Temperature: 99.0 °F Dew Point: 77 °F Humidity: 50% Wind: South at 3.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 115 °F Graphs

Location: Shaw/Tower Grove, St. Louis, MO

Updated: 2:51 PM CDT

Temperature: 93.7 °F Dew Point: 74 °F Humidity: 53% Wind: ESE at 1.1 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Hunters Creek, Mascoutah, IL

Updated: 2:59 PM CDT

Temperature: 91.9 °F Dew Point: 76 °F Humidity: 59% Wind: SSE at 9.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 2:59 PM CDT

Temperature: 96.2 °F Dew Point: 76 °F Humidity: 53% Wind: SE at 3.0 mph Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 111 °F Graphs

Location: MesoWest GARD IL US UPR, Hamel, IL

Updated: 12:25 PM CDT

Temperature: 89 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Hamel, IL 55/140, Worden, IL

Updated: 2:59 PM CDT

Temperature: 91.4 °F Dew Point: 78 °F Humidity: 65% Wind: South at 9.4 mph Pressure: 28.47 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...updated aviation 
National Weather Service St Louis MO 
1242 PM CDT Thu Aug 21 2014 


Short term: (through tonight) 
issued at 200 am CDT Thu Aug 21 2014 


Focus continues to be precip chances influencing temps thru the 
period. 


Mdls are in good agreement regarding synoptic features and mass 
fields. However, subtle differences in thermal profiles and 
mesoscale features will be important over the next few days. Main 
question is centered around ongoing convection over Nebraska and nrn 
Kansas. Believe the GFS handles this S/W the best tracking it thru 
cntl Iowa today along the sfc boundary. Any subsequent outflow 
boundaries will determine how far S convection will propagate this 
afternoon and tonight. Believe the area will remain dry this 
afternoon due to timing of the S/W as well as a lack of stronger 
forcing. A broad low level jet tonight shud be enuf forcing to support thunderstorms and rain 
that may impact nrn portions of the County Warning Area. The most likely timing 
will be late tonight at will at least in part depend upon how 
convection over Iowa region plays out today. 


As for temps, have trended twd the cooler guidance which has 
verified well even in places that did not see thunderstorms and rain over the past 
couple of days. Mdls are slightly cooler with 850mb temps over the 
region. For nrn counties, forecast soundings suggest those regions 
will not mix to 850mb anyway. Prelim forecast of 90 degrees at uin 
may be too warm due to convective debris. Further S, warmer temps 
will be offset by better mixing and therefore, cooler dewpoint 
temps. 


Overall, the resulting heat index values thru this afternoon are 
similar to what was forecast yesterday. Have therefore not made 
any changes to the going headlines. 


Long term: (friday through wednesday) 
issued at 309 am CDT Thu Aug 21 2014 


Focus continues to be temps thru the period with ongoing heat 
headlines. 


Overall, not many changes to the prev forecast. The Gem has come 
into better agreement with other mdl solns, but does still break 
down the upper ridge quicker. Questions regarding the need to 
expand the current advisory remain the same as they did yesterday. 
Mdls depict a weaker cap across much of the region, but especially 
across nrn portions of the County Warning Area. This area is also closer to the 
sfc boundary and may therefore experience more convective debris 
into the weekend, if not storms. Have therefore kept low pops 
going for this area and trended temps cooler. Elsewhere, continued 
a trend twd the cooler mav guidance as mentioned above. 


Mdl solns begin to diverge early next week with the European model (ecmwf) now 
reinforcing the upper ridge, keeping it in place thru the middle 
of the week. However, the GFS/Gem suggest a weaker upper ridge 
across the cntl U.S. Regardless, all mdl guidance suggests cooler 
mid level temps which may allow for afternoon/nocturnal convection 
across the region. Have kept pops on the low end until mdls come 
into better agreement and confidence builds. 


Due to questions mentioned, have not made any changes to the 
ending of the going headlines. However, headlines may need to be 
extended if the upper ridge holds into next week. 


&& 


Aviation: (for the 18z tafs through 18z Friday afternoon) 
issued at 1225 PM CDT Thu Aug 21 2014 


A very warm, moist and unstable air mass currently resides across 
a good portion of Missouri into Illinois. Present indications are 
isolated thunderstorms could develop during the afternoon with 
the most likely location across southern Missouri into southern 
Illinois. This would be south of the terminals, and also given 
the anticipated low coverage and random nature, I have no mention 
in the tafs. The only other precipitation threat would be at KUIN 
late tonight if activity across Iowa drops south, but again the 
probability is too low to mention at this point. Otherwise VFR 
conditions will prevail through the forecast period. 


Specifics for kstl: 


VFR conditions are expected through the forecast period. A very 
warm, moist and unstable air mass currently resides across the 
region. Present indications are isolated thunderstorms could 
develop during the afternoon south of kstl. 


Glass 


&& 


Lsx watches/warnings/advisories: 
MO...heat advisory until 7 PM CDT Sunday for Audrain MO-Boone MO- 
Callaway MO-Cole MO-Franklin MO-Gasconade MO-Jefferson MO- 
Lincoln MO-Madison MO-Moniteau MO-Montgomery MO-Osage MO- 
St. Charles MO-St. Francois MO-Ste. Genevieve MO-Warren MO. 


Excessive heat warning until 7 PM CDT Sunday for St. Louis city 
MO-St. Louis MO. 


Illinois...heat advisory until 7 PM CDT Sunday for Bond Illinois-Calhoun Illinois- 
Clinton Illinois-Greene Illinois-Jersey Illinois-Macoupin Illinois-Marion Illinois-Monroe 
Illinois-Randolph Illinois-Washington Illinois. 


Excessive heat warning until 7 PM CDT Sunday for Madison IL-St. 
Clair Illinois. 


&& 


$$ 


Weather forecast office lsx 












National Weather Service Glossary of Abbreviations

Non-Expanded Version (with abbreviations)

Powered by the Weather Underground, Inc.