Collinsville, Illinois Weather Conditions

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Current Conditions

  • 74°
  • Scattered Clouds
  • Wind: ESE 5 mph
  • Humidity: 85%
  • Visibility: 10.0 miles
  • Dew Point: 69°
  • Pressure: 29.97 in. 0

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Next 12 Hours

5  am
8  am
11  am
2  pm
5  pm
Mostly Cloudy
Mostly Cloudy
Chance of Rain
Chance of Rain
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
74°
73°
77°
78°
78°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Chance of a Thunderstorm
  • High: 79 °
  • Low: 70 °
  • Chance of T-Storms
  • Thursday
  • Mostly Cloudy
  • High: 86 °
  • Low: 69 °
  • Mostly Cloudy
  • Friday
  • Chance of a Thunderstorm
  • High: 89 °
  • Low: 71 °
  • Chance of T-Storms
  • Saturday
  • Partly Cloudy
  • High: 90 °
  • Low: 72 °
  • Partly Cloudy
  • Sunday
  • Chance of a Thunderstorm
  • High: 92 °
  • Low: 74 °
  • Chance of T-Storms

Forecast for Collinsville, Illinois

Updated: 4:01 AM CDT on January 05, 2015

  • Wednesday

    Variable clouds with scattered thunderstorms. High 79F. Winds ESE at 5 to 10 mph. Chance of rain 60%.

  • Wednesday Night

    Scattered thunderstorms. Low around 70F. Winds NE at 5 to 10 mph. Chance of rain 60%.

  • Thursday

    Mainly cloudy. A stray shower or thunderstorm is possible. High 86F. Winds NNE at 5 to 10 mph.

  • Thursday Night

    Partly cloudy skies early. Scattered thunderstorms developing later at night. Low 69F. Winds light and variable. Chance of rain 40%.

  • Friday

    Scattered thunderstorms in the morning, then partly cloudy late. High 89F. Winds light and variable. Chance of rain 40%.

  • Friday Night

    A mostly clear sky. Low 71F. Winds light and variable.

  • Saturday

    Partly cloudy skies. High near 90F. Winds light and variable.

  • Saturday Night

    Partly cloudy in the evening followed by scattered thunderstorms after midnight. Low 72F. Winds light and variable. Chance of rain 50%.

  • Sunday

    Isolated thunderstorms in the morning, then partly cloudy late. High 92F. Winds SE at 10 to 15 mph. Chance of rain 30%.

  • Sunday Night

    Partly cloudy with late night showers or thunderstorms. Low 74F. Winds ESE at 5 to 10 mph. Chance of rain 50%.

  • Monday

    Intervals of clouds and sunshine. High around 90F. Winds NW at 5 to 10 mph.

  • Monday Night

    A mostly clear sky. Low around 70F. Winds N at 5 to 10 mph.

  • Tuesday

    Plentiful sunshine. High 86F. Winds N at 10 to 15 mph.

  • Tuesday Night

    Mostly clear skies. Low 66F. Winds NNE at 5 to 10 mph.

  • Wednesday

    A few clouds from time to time. High 86F. Winds NE at 5 to 10 mph.

  • Wednesday Night

    A mostly clear sky. Low 66F. Winds light and variable.

  • Thursday

    Mostly sunny skies. High near 90F. Winds ENE at 5 to 10 mph.

  • Thursday Night

    A mostly clear sky. Low 67F. Winds SE at 5 to 10 mph.

  • Friday

    Partly cloudy. High around 90F. Winds SE at 5 to 10 mph.

  • Friday Night

    Partly cloudy with late night showers or thunderstorms. Low 68F. Winds light and variable. Chance of rain 40%.

  • Saturday

    Sunny skies. High around 90F. Winds SW at 5 to 10 mph.

  • Saturday Night

    Mostly clear skies in the evening with isolated thunderstorms developing after midnight. Low near 70F. Winds light and variable. Chance of rain 30%.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Collinsville Illinois, Collinsville, IL

Updated: 5:22 AM CDT

Temperature: 73.4 °F Dew Point: 70 °F Humidity: 90% Wind: ESE at 4.5 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Collinsville West, Collinsville, IL

Updated: 5:22 AM CDT

Temperature: 72.0 °F Dew Point: 68 °F Humidity: 87% Wind: East at 5.0 mph Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 70 °F Graphs

Location: Tim and Carolyns yard, COLLINSVILLE, IL

Updated: 5:22 AM CDT

Temperature: 72.9 °F Dew Point: 69 °F Humidity: 88% Wind: Calm Pressure: 30.16 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Stonebridge Farms, Maryville, IL

Updated: 5:22 AM CDT

Temperature: 72.0 °F Dew Point: 67 °F Humidity: 85% Wind: SE at 6.9 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Rolling Meadows Dr, Maryville, IL

Updated: 5:22 AM CDT

Temperature: 72.1 °F Dew Point: 67 °F Humidity: 83% Wind: NE at 2.2 mph Pressure: 29.32 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Barbarotto Compound, Maryville, IL

Updated: 5:22 AM CDT

Temperature: 71.4 °F Dew Point: 67 °F Humidity: 86% Wind: ENE at 7.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Meadowbrooke, Troy, IL

Updated: 5:13 AM CDT

Temperature: 71.7 °F Dew Point: 68 °F Humidity: 87% Wind: East at 3.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Nolan Creek Subdivision, OFallon, IL

Updated: 5:17 AM CDT

Temperature: 71.7 °F Dew Point: 69 °F Humidity: 91% Wind: ENE at 4.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Fairwood Hills, OFallon, IL

Updated: 5:22 AM CDT

Temperature: 72.0 °F Dew Point: 70 °F Humidity: 93% Wind: Calm Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Birmingham Drive, Glen Carbon, IL

Updated: 5:20 AM CDT

Temperature: 70.7 °F Dew Point: 65 °F Humidity: 82% Wind: North at - Pressure: 30.03 in Hourly Precipitation: - Heat Index: 71 °F Graphs

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

Updated: 5:17 AM CDT

Temperature: 69.7 °F Dew Point: 66 °F Humidity: 89% Wind: Calm Pressure: 29.97 in Hourly Precipitation: - Heat Index: - Graphs

Location: New Goose, Fairview Heights, IL

Updated: 5:22 AM CDT

Temperature: 72.5 °F Dew Point: 69 °F Humidity: 90% Wind: South at 3.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Milam Landfill, East Saint Louis, IL

Updated: 5:19 AM CDT

Temperature: 73.8 °F Dew Point: 68 °F Humidity: 83% Wind: East at 8.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: PRAIRIE LAWN, OFallon, IL

Updated: 5:09 AM CDT

Temperature: 71.8 °F Dew Point: 70 °F Humidity: 94% Wind: NE at 1.7 mph Pressure: 29.96 in Hourly Precipitation: - Heat Index: - Graphs

Location: Chateau Estates, Fairview Heights, IL

Updated: 5:22 AM CDT

Temperature: 72.1 °F Dew Point: 69 °F Humidity: 90% Wind: ESE at 1.0 mph Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Prairie Manor, Edwardsville, IL

Updated: 5:22 AM CDT

Temperature: 69.6 °F Dew Point: 68 °F Humidity: 96% Wind: ENE at 2.7 mph Pressure: - Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 5:08 AM CDT

Temperature: 73.6 °F Dew Point: 67 °F Humidity: 80% Wind: East at 1.7 mph Pressure: 29.92 in Hourly Precipitation: - Heat Index: 74 °F Graphs

Location: MesoWest, Granite City, IL

Updated: 1:40 AM CDT

Temperature: 74 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: 27th Street, Granite City, IL

Updated: 5:21 AM CDT

Temperature: 76.8 °F Dew Point: 68 °F Humidity: 74% Wind: North at - Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 5:12 AM CDT

Temperature: 70.1 °F Dew Point: 68 °F Humidity: 94% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 5:20 AM CDT

Temperature: 69.7 °F Dew Point: 68 °F Humidity: 95% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 5:22 AM CDT

Temperature: 72.3 °F Dew Point: 72 °F Humidity: 99% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: North Horner Park, Lebanon, IL

Updated: 4:46 AM CDT

Temperature: 70.0 °F Dew Point: 58 °F Humidity: 66% Wind: Calm Pressure: 30.14 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Village of Shiloh, OFallon, IL

Updated: 5:20 AM CDT

Temperature: 71.1 °F Dew Point: 68 °F Humidity: 89% Wind: East at 1.0 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Lake Christine, Belleville, IL

Updated: 5:08 AM CDT

Temperature: 72.3 °F Dew Point: 69 °F Humidity: 89% Wind: ENE at 1.1 mph Pressure: 29.76 in Hourly Precipitation: - Heat Index: - Graphs

Location: West End, Belleville, IL

Updated: 5:22 AM CDT

Temperature: 73.2 °F Dew Point: 55 °F Humidity: 71% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: APRSWXNET, Belleville, IL

Updated: 4:45 AM CDT

Temperature: 73 °F Dew Point: 70 °F Humidity: 91% Wind: East at 2 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 70 °F Graphs

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

Updated: 5:22 AM CDT

Temperature: 70.0 °F Dew Point: 68 °F Humidity: 92% Wind: Calm Pressure: 30.13 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Belleville, IL, Belleville, IL

Updated: 5:22 AM CDT

Temperature: 72.9 °F Dew Point: 64 °F Humidity: 74% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service St Louis MO 
343 am CDT Wednesday Aug 5 2015 


Short term: (through tonight) 
issued at 340 am CDT Wednesday Aug 5 2015 




Primary concern for the today/tonight period will be on possibility 
of heavy rainfall. Latest guidance has come in more in line with the 
old European with respect to track of upper-level impulse coming 
down from the middle-Missouri Valley and its associated low-level 
cyclone transversing the baroclinic zone. This results in a track of 
the system further south and several hours faster than what it 
looked like 24 hours ago. As a result...main changes were to lower 
quantitative precipitation forecast amounts...particularly along and north of the I-70 corridor...as 
well as reduce probability of precipitation for late tonight. Have therefore elected to trim 
northern extent of the Flash Flood Watch including the cities of 
Columbia and St. Louis. In addition...have Flash Flood Watch now 
expiring at 9z instead of 12z to match up better with pop forecast 
for late tonight. Still have concerns that many counties in the 
northern portion of the existing watch may not receive overly heavy 
rainfall with forecast rain amounts through tonight only around one 
inch but did leave some wiggle room in case the heavy rainfall axis 
shifts back to the north and east a bit. Heaviest rainfall through 
tonight likely to be across the far southern portion of the 
County Warning Area...I.E. Reynolds/Iron/Madison counties in Missouri with up to two 
inches of rain possible where strongest low-level forcing will 
reside this evening. Another concern regarding through tonight 
is that there may not be an abundance of convective activity 
typically necessary for heavy rainfall rates both this morning as 
well as overnight tonight as some model guidance suggests little to 
no MUCAPE well north of the surface front. 


Temperatures will not move much through tonight with low diurnal 
ranges due to a lowering cloud deck....precipitation...and an 
easterly component to the surface wind. Highs are expected to be in the 
upper 70s to near 80 degrees for most areas which is a degree or two 
below MOS. For lows tonight...seasonable temperatures are expected. 




Gosselin 




Long term: (tonight through tuesday) 
issued at 340 am CDT Wednesday Aug 5 2015 




(thursday - tuesday) 


System will depart early on Thursday with just some schc/chance probability of precipitation 
confined to the southeastern edge of the County Warning Area with middle/upper level 
subsidence setting in behind the shortwave trough. Clouds should 
linger however over much of the area which will result in a cooler 
than normal day with highs in the low to middle 80s. 


A midlevel anticyclone will strengthen over the Southern Plains 
beginning on Friday putting the middle-Mississippi Valley on the 
northeastern periphery of the ridge axis through Monday. 
Temperature/probability of precipitation forecasts appear difficult in this time frame as 
timing of individual ridge-runner shortwaves is near impossible at 
this range. Have schc/chance probability of precipitation each day/night with near normal 
temperatures...in other words climatology for temps/pops. Probably 
not a bad guess this far out given the pattern. 


One final chance of showers/storms on Monday as a cold front looks 
to push south of the area with the ridge axis aloft shifting further 
westward. Drier and cooler air appears likely for Tuesday given this 
scenario. 




Gosselin 




&& 


Aviation: (for the 06z tafs through 06z Wednesday night) 
issued at 1201 am CDT Wednesday Aug 5 2015 


Main area of rain filling in over southwest MO currently and it 
now looks like much of the I-70 taf sites...cou and stl 
metropolitan...will be on the northern edge of this rain through much of 
Wednesday. Have maintained a rainy forecast with minimal 
restrictions, but a slight turn more to the south of this system 
could keep these areas now mostly dry. Uin may miss much of this 
system other than the outflow generated rain showers moving their way 
over the next few hours. Still looking at a break midday into 
early afternoon with new development 4-5 hours later heading 
towards early evening. Light easterly flow expected for much of 
the valid period. VFR conditions will give way to MVFR at most 
sites late tonight and Wednesday. 


Specifics for kstl: should be quiet and VFR until late tonight 
when the next round of rain with perhaps some thunderstorms and rain moves in. A 
this will probably continue until midday when it exits and a new, 
initially more scattered, round develops late afternoon and 
continues into the evening. Light easterly flow through the period 
with MVFR ceilings prevailing more on Wednesday. 


Tes 


&& 


Preliminary point temperatures/pops: 
Saint Louis 81 71 84 71 / 80 70 10 10 
Quincy 80 66 82 67 / 50 30 10 20 
Columbia 79 69 84 70 / 80 60 10 30 
Jefferson City 79 69 84 71 / 90 70 10 40 
Salem 81 71 82 67 / 80 80 30 10 
Farmington 78 69 83 68 / 90 90 20 20 


&& 


Lsx watches/warnings/advisories: 
MO...Flash Flood Watch from 7 am CDT this morning through late 
tonight for Cole MO-Crawford MO-Franklin MO-Gasconade MO- 
Iron MO-Jefferson MO-Madison MO-Moniteau MO-Osage MO- 
Reynolds MO-St. Francois MO-Ste. Genevieve MO-Washington MO. 


Illinois...Flash Flood Watch from 7 am CDT this morning through late 
tonight for Monroe Illinois-Randolph IL-St. Clair Illinois-Washington 
Illinois. 


&& 


$$ 


Weather forecast office lsx 






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