Alton, Illinois Weather Conditions

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Current Conditions

  • 52°
  • Scattered Clouds
  • Wind: South 131 mph
  • Humidity: 88%
  • Visibility: 10.0 miles
  • Dew Point: 48°
  • Pressure: 29.96 in. -

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Next 12 Hours

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6  am
Chance of Rain
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Rain Showers
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Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Saturday
  • Rain Showers
  • High: 59 °
  • Low: 48 °
  • Rain Showers
  • Sunday
  • Chance of a Thunderstorm
  • High: 57 °
  • Low: 37 °
  • Chance of T-Storms
  • Monday
  • Chance of Rain
  • High: 39 °
  • Low: 25 °
  • Chance of Rain
  • Tuesday
  • Partly Cloudy
  • High: 37 °
  • Low: 27 °
  • Partly Cloudy
  • Wednesday
  • Partly Cloudy
  • High: 48 °
  • Low: 25 °
  • Partly Cloudy

Forecast for Alton, Illinois

Updated: 3:00 PM CST on November 22, 2014

  • Saturday

    Overcast with a chance of rain, then rain showers in the afternoon. High of 59F. Winds from the South at 10 to 15 mph. Chance of rain 50%.

  • Saturday Night

    Overcast with a chance of rain, then rain showers after midnight. Low of 48F. Winds from the South at 10 to 15 mph. Chance of rain 60%.

  • Sunday

    Overcast with rain showers, then a chance of a thunderstorm and rain showers in the afternoon. High of 57F. Winds from the SE at 10 to 15 mph. Chance of rain 100% with rainfall amounts near 0.6 in. possible.

  • Sunday Night

    Overcast with rain. Low of 37F. Winds from the SW at 10 to 15 mph. Chance of rain 70% with rainfall amounts near 0.5 in. possible.

  • Monday

    Overcast with a chance of rain. High of 39F with a windchill as low as 28F. Breezy. Winds from the West at 15 to 20 mph with gusts to 30 mph. Chance of rain 20%.

  • Monday Night

    Overcast in the evening, then mostly cloudy. Low of 25F with a windchill as low as 18F. Winds from the West at 10 to 15 mph.

  • Tuesday

    Partly cloudy. High of 37F with a windchill as low as 18F. Winds from the West at 10 to 15 mph.

  • Tuesday Night

    Partly cloudy in the evening, then overcast. Low of 27F. Winds from the SSW at 5 to 10 mph.

  • Wednesday

    Partly cloudy in the morning, then overcast. High of 48F. Winds from the SSW at 10 to 15 mph.

  • Wednesday Night

    Partly cloudy. Fog overnight. Low of 25F with a windchill as low as 18F. Winds from the SW at 5 to 10 mph.

  • Thursday

    Overcast. Fog early. High of 36F with a windchill as low as 16F. Breezy. Winds from the WSW at 10 to 20 mph shifting to the NW in the afternoon.

  • Thursday Night

    Overcast. Fog overnight. Low of 19F with a windchill as low as 9F. Winds from the NNE at 5 to 15 mph.

  • Friday

    Overcast. Fog early. High of 30F with a windchill as low as 16F. Winds from the NE at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Fog overnight. Low of 25F with a windchill as low as 12F. Winds from the North at 5 to 10 mph.

  • Saturday

    Mostly cloudy. High of 36F with a windchill as low as 19F. Winds from the NE at 5 to 10 mph.

  • Saturday Night

    Partly cloudy with a chance of snow. Fog overnight. Low of 27F with a windchill as low as 19F. Winds from the ESE at 10 to 15 mph. Chance of snow 40%.

  • Sunday

    Overcast with a chance of snow. Fog early. High of 37F. Winds from the SSE at 5 to 15 mph. Chance of snow 30%.

  • Sunday Night

    Overcast with a chance of a thunderstorm. Fog overnight. Low of 27F. Winds less than 5 mph. Chance of rain 20%.

  • Monday

    Partly cloudy. Fog early. High of 36F. Winds less than 5 mph.

  • Monday Night

    Partly cloudy. Fog overnight. Low of 25F. Winds less than 5 mph.

  • Tuesday

    Mostly cloudy. Fog early. High of 39F. Winds less than 5 mph.

  • Tuesday Night

    Mostly cloudy with a chance of a thunderstorm. Fog overnight. Low of 28F. Winds less than 5 mph. Chance of rain 20%.

  • Wednesday

    Clear. Fog early. High of 54F. Winds less than 5 mph.

  • Wednesday Night

    Clear. Low of 28F. Winds from the ENE at 5 to 10 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Alton, IL

Updated: 6:40 PM CST

Temperature: 51.1 °F Dew Point: 50 °F Humidity: 94% Wind: South at 2.2 mph Pressure: 29.92 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: Alton - Beacon, Alton, IL

Updated: 6:41 PM CST

Temperature: 52.3 °F Dew Point: 50 °F Humidity: 93% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: Alton - Christian Hill Area, Alton, IL

Updated: 6:40 PM CST

Temperature: 52.4 °F Dew Point: 49 °F Humidity: 88% Wind: SE at 2.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Alton - Rock Gate Estates, Alton, IL

Updated: 6:41 PM CST

Temperature: 52.6 °F Dew Point: 52 °F Humidity: 96% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 6:30 PM CST

Temperature: 51.9 °F Dew Point: 50 °F Humidity: 94% Wind: SE at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 6:30 PM CST

Temperature: 52.2 °F Dew Point: 50 °F Humidity: 92% Wind: ESE at 2.7 mph Pressure: 29.80 in Hourly Precipitation: - Windchill: - Graphs

Location: WEST ALTON, West Alton, MO

Updated: 6:40 PM CST

Temperature: 53.8 °F Dew Point: - Humidity: - Wind: North at - Pressure: - Hourly Precipitation: - Windchill: - Graphs

Location: Godfrey River Aire Subdivision, Godfrey, IL

Updated: 6:41 PM CST

Temperature: 52.6 °F Dew Point: 50 °F Humidity: 89% Wind: SSE at 1.0 mph Pressure: 29.90 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Rosewood Heights, East Alton, IL

Updated: 6:41 PM CST

Temperature: 53.3 °F Dew Point: 49 °F Humidity: 85% Wind: South at 7.0 mph Pressure: 29.92 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: Foster Township, Alton, IL

Updated: 6:27 PM CST

Temperature: 51.4 °F Dew Point: 50 °F Humidity: 95% Wind: SSE at 2.2 mph Pressure: 29.91 in Hourly Precipitation: - Windchill: - Graphs

Location: Jersey County along IL 111, Brighton, IL

Updated: 6:40 PM CST

Temperature: 51.4 °F Dew Point: 48 °F Humidity: 87% Wind: Calm Pressure: 29.60 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 6:40 PM CST

Temperature: 52.6 °F Dew Point: 50 °F Humidity: 91% Wind: SE at 3.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Bethalto, IL

Updated: 6:41 PM CST

Temperature: 54.5 °F Dew Point: -1 °F Humidity: 10% Wind: East at 8.3 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Jost Farm, Florissant, MO

Updated: 6:40 PM CST

Temperature: 53.6 °F Dew Point: 45 °F Humidity: 73% Wind: South at 4.5 mph Pressure: 29.90 in Hourly Precipitation: 0.02 in Windchill: - Graphs

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

Updated: 4:30 PM CST

Temperature: 54 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Grand Ave, Edwardsville, IL

Updated: 6:40 PM CST

Temperature: 53.6 °F Dew Point: 49 °F Humidity: 83% Wind: Calm Pressure: 30.01 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: Riverwood Place, Florissant, MO

Updated: 6:41 PM CST

Temperature: 53.6 °F Dew Point: 51 °F Humidity: 92% Wind: South at 1.0 mph Pressure: 29.95 in Hourly Precipitation: 0.02 in Windchill: - Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 6:40 PM CST

Temperature: 53.5 °F Dew Point: 51 °F Humidity: 91% Wind: South at 3.0 mph Pressure: 29.94 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 6:27 PM CST

Temperature: 54.1 °F Dew Point: 50 °F Humidity: 85% Wind: SSE at 7.3 mph Pressure: 29.92 in Hourly Precipitation: - Windchill: - Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 6:26 PM CST

Temperature: 54.0 °F Dew Point: 51 °F Humidity: 89% Wind: SW at 2.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: MesoWest SHPMAN IL US UPR, Shipman, IL

Updated: 5:20 PM CST

Temperature: 51 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Kelly Greens Weather Station, Edwardsville, IL

Updated: 6:41 PM CST

Temperature: 53.1 °F Dew Point: 51 °F Humidity: 92% Wind: South at 6.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: MesoWest GARD IL US UPR, Hamel, IL

Updated: 5:35 PM CST

Temperature: 49 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 49 °F Graphs

Location: APRSWXNET Berkeley MO US, Woodson Terrace, MO

Updated: 4:46 PM CST

Temperature: 54 °F Dew Point: 49 °F Humidity: 83% Wind: SSE at 1 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Barbarotto Compound, Maryville, IL

Updated: 6:41 PM CST

Temperature: 53.3 °F Dew Point: 51 °F Humidity: 90% Wind: SSW at 3.0 mph Pressure: 29.88 in Hourly Precipitation: 0.01 in Windchill: - Graphs

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

Updated: 6:41 PM CST

Temperature: 52.8 °F Dew Point: 50 °F Humidity: 91% Wind: SSW at 1.0 mph Pressure: 29.95 in Hourly Precipitation: 0.02 in Windchill: - Graphs

Location: Rolling Meadows Dr, Maryville, IL

Updated: 6:41 PM CST

Temperature: 54.0 °F Dew Point: 50 °F Humidity: 86% Wind: SE at 4.9 mph Pressure: 29.32 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Polestar Boating Center, St. Charles, MO

Updated: 6:40 PM CST

Temperature: 51.4 °F Dew Point: 49 °F Humidity: 93% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Windchill: - Graphs

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

Updated: 6:33 PM CST

Temperature: 52.7 °F Dew Point: 50 °F Humidity: 92% Wind: South at 2.7 mph Pressure: 29.83 in Hourly Precipitation: - Windchill: - Graphs

Location: Liberty Place, Troy, IL

Updated: 6:40 PM CST

Temperature: 53.8 °F Dew Point: 51 °F Humidity: 89% Wind: SE at 5.0 mph Pressure: 29.32 in Hourly Precipitation: 0.02 in Windchill: - Graphs

Location: Branch Street, St. Louis, MO

Updated: 6:40 PM CST

Temperature: 56.5 °F Dew Point: - Humidity: 75% Wind: North at - Pressure: 29.49 in Hourly Precipitation: - Windchill: - Graphs

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

Updated: 6:41 PM CST

Temperature: 52.5 °F Dew Point: 49 °F Humidity: 88% Wind: South at 6.8 mph Pressure: 28.49 in Hourly Precipitation: 0.01 in Windchill: - Graphs

Location: BLAIR STREET, St. Louis, MO

Updated: 6:40 PM CST

Temperature: 56.5 °F Dew Point: - Humidity: 82% Wind: North at - Pressure: 29.43 in Hourly Precipitation: - Windchill: - Graphs

Location: Collinsville West, Collinsville, IL

Updated: 6:41 PM CST

Temperature: 53.5 °F Dew Point: 51 °F Humidity: 90% Wind: SSW at 9.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Windchill: - 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 
538 PM CST Sat Nov 22 2014 


Short term: (through late tonight) 
issued at 347 PM CST Sat Nov 22 2014 


Scattered showers are already moving across the southern half the 
County Warning Area this afternoon in an area of modest 925-850mb moisture 
convergence ahead of the trough currently over the southern High 
Plains. Expect rain to become more widespread late this afternoon 
into the early evening hours over the southern two thirds of the County Warning Area 
as the showers currently over southwest Missouri continue to move 
northeast into the area. This is being forced by an area of 
stronger low level moisture convergence that the hrrr shows moving 
across the area between 22-03z. While there will still continue to 
be scattered showers elsewhere behind this area through late 
evening, it still appears that better chances for more widespread 
rain will move in from the west after midnight. By that time, large 
scale ascent and moisture convergence will be increasing ahead of the 
aforementioned Southern Plains trough that will be ejecting 
northeastward ahead of longwave trough. With clouds and warm air 
advection tonight, stayed with lows that were close to going 
temperatures and MOS guidance. 


Britt 


Long term: (sunday through next saturday) 
issued at 347 PM CST Sat Nov 22 2014 


Rain and a few thunderstorms are expected on Sunday as a southern 
stream, negatively tilted shortwave moves from eastern Texas 
northeastward into the Tennessee and Ohio Valley regions, while a northern 
stream upper level trough/low moves slowly east southeastward 
through the northern plains. The models were depicting upper level 
divergence over our area between a strong upper level jet streak 
across the Southern Plains and a weaker upper level jet streak over 
the Great Lakes region. The models have some discrepencies as to 
the exact track of the deepening surface low, but at this time it 
appears that it will move northeastward through or just north of the 
stl area around 00z Monday. There will be ample instability for at 
least isolated thunderstorms on Sunday into Sunday evening, 
especially across southeast MO and southwest Illinois. Strong low level 
cold air advection can be expected Sunday night after the passage of 
the low and trailing cold front. The threat for precipitation will 
continue Sunday night as shortwaves rotate through our area south of 
the main upper level low/trough over the northern plains. As the 
colder air filters southeastward into the region the rain may change 
over to light snow before ending late Sunday night/early Monday 
morning across portions of northeast and central MO as well as west 
central Illinois. Most of the precipitation will shift east of our 
forecast area by Monday, although there may be some lingering light 
snow or flurries mainly across west central Illinois. Much colder 
temperatures can be expected for Monday, with nearly steady 
temperatures, mainly in the middle 30s to lower 40s as the NAM and 
European model (ecmwf) models drop the -8 degree c 850 mb isotherm southward to stl. 
The GFS model is even colder and quicker bringing the colder air 
southeastward into our forecast area. An unseasonably cold period 
is expected through Tuesday night as a large amplitude positively 
tilted upper level trough moves eastward through the central US. 
The GFS and European model (ecmwf) models are still hinting at the possibility of a 
northwest flow shortwave and associated weak surface low to bring a 
quick shot of rain/snow to our area late Tuesday night and 
Wednesday. The models, particularly the GFS are not as cold for 
Thanksgiving day with the coldest air remaining just north of our 
forecast area, although a strong surface ridge is still forecast to 
build southeastward into the region from the northern plains on 
Thanksgiving. 


Gks 


&& 


Aviation: (for the 00z tafs through 00z Sunday evening) 
issued at 522 PM CST Sat Nov 22 2014 


Specifics for kcou, kuin: conditions may initially bounce between 
MVFR and VFR early in the taf period, but any improvement to VFR should 
be temporary based on a broader cig/vis analysis and moisture 
forecasts. An approaching low pressure system will bring 
widespread rain to kcou and KUIN on Sunday, and conditions are 
expected to fall to IFR. Precipitation should end with the passage 
of a cold front beyond the end of the 24-hr taf period. 


Specifics for kstl, ksus, kcps: an area of rain showers was moving 
northeastwards across the St. Louis Metro area terminals at taf 
issuance. Ceilings will probably bounce between VFR and MVFR 
before falling solidly into MVFR with the arrival of the rain. 
Much more widespread rain is expected on Sunday ahead of a low 
pressure system, and conditions will likely fall to IFR during 
this time. Rain should end on Sunday night with the arrival of a 
cold front. 


Kanofsky 


&& 


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


$$ 


Weather forecast office lsx 



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