Alton, Illinois Weather Conditions

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Current Conditions

  • 77°
  • Mostly Cloudy
  • Wind: Variable 5 mph
  • Humidity: 69%
  • Visibility: 10.0 miles
  • Dew Point: 66°
  • Pressure: 30.06 in. 0

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Next 12 Hours

4  pm
7  pm
10  pm
1  am
4  am
Thunderstorm
T-storms
Chance of a Thunderstorm
Chance of T-storms
Partly Cloudy
Partly Cloudy
Fog
Fog
Fog
Fog
81°
75°
64°
63°
61°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Thunderstorm
  • High: 82 °
  • Low: 59 °
  • T-Storms
  • Saturday
  • Partly Cloudy
  • High: 82 °
  • Low: 61 °
  • Partly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 81 °
  • Low: 59 °
  • Partly Cloudy
  • Monday
  • Partly Cloudy
  • High: 86 °
  • Low: 63 °
  • Partly Cloudy
  • Tuesday
  • Partly Cloudy
  • High: 86 °
  • Low: 66 °
  • Partly Cloudy

Forecast for Alton, Illinois

Updated: 4:00 PM CDT on August 01, 2014

  • Friday

    Mostly cloudy with thunderstorms and rain showers in the afternoon. High of 82F. Winds less than 5 mph. Chance of rain 30%.

  • Friday Night

    Clear with a chance of a thunderstorm and a chance of rain. Fog overnight. Low of 59F. Winds less than 5 mph.

  • Saturday

    Partly cloudy. High of 82F. Winds from the NNE at 5 to 10 mph.

  • Saturday Night

    Partly cloudy. Fog overnight. Low of 61F. Winds less than 5 mph.

  • Sunday

    Partly cloudy. Fog early. High of 81F. Winds from the ENE at 5 to 10 mph.

  • Sunday Night

    Partly cloudy. Fog overnight. Low of 59F. Winds less than 5 mph.

  • Monday

    Partly cloudy. Fog early. High of 86F. Winds less than 5 mph.

  • Monday Night

    Partly cloudy in the evening, then clear. Low of 63F. Winds less than 5 mph.

  • Tuesday

    Clear in the morning, then partly cloudy. High of 86F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Low of 66F. Winds from the ESE at 5 to 10 mph.

  • Wednesday

    Mostly cloudy with a chance of a thunderstorm. High of 82F. Winds less than 5 mph. Chance of rain 20%.

  • Wednesday Night

    Clear with a chance of a thunderstorm. Fog overnight. Low of 63F. Winds from the East at 5 to 10 mph. Chance of rain 40% with rainfall amounts near 0.2 in. possible.

  • Thursday

    Mostly cloudy with a chance of a thunderstorm. High of 84F. Winds from the SE at 5 to 10 mph. Chance of rain 50%.

  • Thursday Night

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

  • Friday

    Mostly cloudy with a chance of a thunderstorm. High of 88F. Winds from the South at 5 to 10 mph. Chance of rain 40%.

  • Friday Night

    Clear. Fog overnight. Low of 59F. Winds from the SSE at 5 to 10 mph.

  • Saturday

    Mostly cloudy with a chance of a thunderstorm. Fog early. High of 79F. Winds less than 5 mph. Chance of rain 30%.

  • Saturday Night

    Partly cloudy. Fog overnight. Low of 57F. Winds less than 5 mph.

  • Sunday

    Clear. Fog early. High of 79F. Winds less than 5 mph.

  • Sunday Night

    Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 59F. Winds less than 5 mph. Chance of rain 50% with rainfall amounts near 0.3 in. possible.

  • Monday

    Partly cloudy with a chance of a thunderstorm. Fog early. High of 79F. Winds less than 5 mph. Chance of rain 50%.

  • Monday Night

    Clear. Fog overnight. Low of 59F. Winds less than 5 mph.

  • Tuesday

    Clear. High of 82F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Low of 59F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: MesoWest ALTON IL US UPR, Alton, IL

Updated: 2:25 PM CDT

Temperature: 91 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Alton - Beacon, Alton, IL

Updated: 5:26 PM CDT

Temperature: 76.7 °F Dew Point: 68 °F Humidity: 74% Wind: NE at 1.0 mph Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Alton - Christian Hill Area, Alton, IL

Updated: 5:25 PM CDT

Temperature: 76.0 °F Dew Point: 66 °F Humidity: 72% Wind: Calm Pressure: 30.01 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Alton - Rock Gate Estates, Alton, IL

Updated: 5:26 PM CDT

Temperature: 75.0 °F Dew Point: 68 °F Humidity: 78% Wind: Calm Pressure: 30.08 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 5:14 PM CDT

Temperature: 76.7 °F Dew Point: 67 °F Humidity: 71% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 5:20 PM CDT

Temperature: 76.3 °F Dew Point: 66 °F Humidity: 70% Wind: WNW at 3.2 mph Pressure: 29.92 in Hourly Precipitation: - Heat Index: 78 °F Graphs

Location: Godfrey River Aire Subdivision, Godfrey, IL

Updated: 5:26 PM CDT

Temperature: 74.1 °F Dew Point: 66 °F Humidity: 77% Wind: ENE at 1.0 mph Pressure: 30.01 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: Foster Township, Alton, IL

Updated: 5:23 PM CDT

Temperature: 71.6 °F Dew Point: 67 °F Humidity: 85% Wind: ENE at 4.7 mph Pressure: 30.01 in Hourly Precipitation: - Heat Index: 70 °F Graphs

Location: Jersey County along IL 111, Brighton, IL

Updated: 5:25 PM CDT

Temperature: 75.4 °F Dew Point: 67 °F Humidity: 76% Wind: Calm Pressure: 29.74 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 5:25 PM CDT

Temperature: 73.8 °F Dew Point: 68 °F Humidity: 83% Wind: North at 3.0 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Jost Farm, Florissant, MO

Updated: 5:25 PM CDT

Temperature: 78.4 °F Dew Point: 64 °F Humidity: 61% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 80 °F Graphs

Location: MesoWest NAMOK2 IL US UPR, Granite City, IL

Updated: 4:20 PM CDT

Temperature: 80 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

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

Updated: 3:55 PM CDT

Temperature: 79 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Grand Ave, Edwardsville, IL

Updated: 5:25 PM CDT

Temperature: 76.1 °F Dew Point: 67 °F Humidity: 74% Wind: Calm Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Knight Compound, Dorsey, IL

Updated: 5:26 PM CDT

Temperature: 70.3 °F Dew Point: 66 °F Humidity: 85% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Riverwood Place, Florissant, MO

Updated: 5:26 PM CDT

Temperature: 74.8 °F Dew Point: 70 °F Humidity: 86% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 5:25 PM CDT

Temperature: 72.4 °F Dew Point: 66 °F Humidity: 80% Wind: Calm Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 5:12 PM CDT

Temperature: 74.9 °F Dew Point: 67 °F Humidity: 76% Wind: NE at 2.0 mph Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: MesoWest SHPMAN IL US UPR, Shipman, IL

Updated: 2:10 PM CDT

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

Location: Piasa, Piasa, IL

Updated: 5:13 PM CDT

Temperature: 72.3 °F Dew Point: 66 °F Humidity: 81% Wind: NE at 3.0 mph Pressure: 30.01 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Kelly Greens Weather Station, Edwardsville, IL

Updated: 5:26 PM CDT

Temperature: 73.8 °F Dew Point: 66 °F Humidity: 78% Wind: SE at 1.0 mph Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: MesoWest GARD IL US UPR, Hamel, IL

Updated: 4:25 PM CDT

Temperature: 76 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: APRSWXNET Berkeley MO US, Woodson Terrace, MO

Updated: 4:46 PM CDT

Temperature: 76 °F Dew Point: 67 °F Humidity: 74% Wind: Calm Pressure: 30.09 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Barbarotto Compound, Maryville, IL

Updated: 5:26 PM CDT

Temperature: 73.9 °F Dew Point: 65 °F Humidity: 74% Wind: ENE at 2.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

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

Updated: 5:26 PM CDT

Temperature: 74.7 °F Dew Point: 68 °F Humidity: 81% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: Rolling Meadows Dr, Maryville, IL

Updated: 5:26 PM CDT

Temperature: 74.8 °F Dew Point: 61 °F Humidity: 62% Wind: NNW at 1.3 mph Pressure: 29.41 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Polestar Boating Center, St. Charles, MO

Updated: 5:26 PM CDT

Temperature: 76.5 °F Dew Point: 66 °F Humidity: 70% Wind: West at 1.0 mph Pressure: 30.10 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

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

Updated: 5:15 PM CDT

Temperature: 76.1 °F Dew Point: 66 °F Humidity: 72% Wind: Calm Pressure: 29.99 in Hourly Precipitation: - Heat Index: 78 °F Graphs

Location: Liberty Place, Troy, IL

Updated: 4:58 PM CDT

Temperature: 77.5 °F Dew Point: 67 °F Humidity: 71% Wind: ENE at 7.0 mph Pressure: 29.42 in Hourly Precipitation: 0.00 in Heat Index: 79 °F Graphs

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

Updated: 5:26 PM CDT

Temperature: 72.3 °F Dew Point: 64 °F Humidity: 76% Wind: East at 7.3 mph Pressure: 28.58 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Collinsville West, Collinsville, IL

Updated: 5:26 PM CDT

Temperature: 76.1 °F Dew Point: 68 °F Humidity: 76% Wind: Calm Pressure: 30.08 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 
National Weather Service St Louis MO 
336 PM CDT Fri Aug 1 2014 


Short term: (through late tonight) 
issued at 330 PM CDT Fri Aug 1 2014 




Water vapor imagery depicts a shortwave trough currently along the 
Missouri River southeast of koax heading southeast and will be the main 
feature of interest tonight. Scattered showers and thunderstorms 
have persisted through early this afternoon and believe they will continue 
to survive into the evening hours. However...with loss of 
instability...precipitation should become more showery and devoid 
of thunder similar to what happened last night across northwest 
Missouri. 


Drier weather with decreasing cloudiness is expected behind this feature 
setting the stage for another cool Summer night. Other concern then turns 
to fog as winds remain light/variable or calm. Combine that with fairly 
clear skies expected late tonight and higher dewpoints compared to a 
of days ago...did add mention of patchy fog for the entire County Warning Area as 
forecast minimums in most of these locales are several degrees 
below crossover temperatures. Dense fog will be more likely in 
areas which receive higher rainfall totals through this evening. 




Gosselin 




Long term: (saturday through next friday) 
issued at 330 PM CDT Fri Aug 1 2014 




(saturday - friday) 


Secondary shortwave trough looks to be a bit further to the east tomorrow 
than it was modeled 24 hours ago. Consequently...did drop the sch pops 
along and east of the Mississippi River. Also yielded toward the warmer 
guidance with respect to highs tomorrow due to less expected diurnal cu 
as well as a slight warming in 850-hpa temperatures. 


Sunday and Monday also look dry with high temperatures back to near normal 
for early August. 


A more active pattern still could be in the offing for the middle to late 
next week as bi-state area will lie beneath quasi-zonal/west-northwest flow 
aloft. At least a few shortwave troughs will come across during 
this time frame and should interact with a tightening low-level 
baroclinic zone. Only have chance pops Wednesday - Friday for now 
due to uncertainity/timing issues...but does appear that we will be 
heading into a much wetter pattern than the past couple of weeks. 
As for temperatures...lows will likely remain near or even 
slightly above normal but highs are forecast to return to slightly 
below normal due to expected clouds/rain chances. 




Gosselin 


&& 


Aviation: (for the 18z tafs through 18z Saturday afternoon) 
issued at 1234 PM CDT Fri Aug 1 2014 


Sct thunderstorms and rain will may impact terminals this afternoon. VFR conditions 
are expected outside of any thunderstorms and rain. Winds aob 7 kts thru the end of 
the period. 


&& 


Preliminary point temperatures/pops: 
Saint Louis 64 87 65 88 / 20 10 0 5 
Quincy 57 85 61 85 / 20 10 0 5 
Columbia 59 87 63 88 / 10 10 10 5 
Jefferson City 59 87 63 88 / 20 10 10 5 
Salem 62 84 60 84 / 30 10 0 5 
Farmington 61 86 60 86 / 30 10 5 5 


&& 


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


$$ 


Weather forecast office lsx 












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