Alton, Illinois Weather Conditions

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Current Conditions

  • 58°
  • Clear
  • Wind: Calm
  • Humidity: 99%
  • Visibility: 7.0 miles
  • Dew Point: 57°
  • Pressure: 30.10 in. +

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Next 12 Hours

2  am
5  am
8  am
11  am
2  pm
Clear
Clear
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
58°
58°
63°
75°
81°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Partly Cloudy
  • High: 84 °
  • Low: 63 °
  • Partly Cloudy
  • Saturday
  • Mostly Cloudy
  • High: 85 °
  • Low: 65 °
  • Mostly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 87 °
  • Low: 64 °
  • Partly Cloudy
  • Monday
  • Clear
  • High: 90 °
  • Low: 65 °
  • Clear
  • Tuesday
  • Partly Cloudy
  • High: 90 °
  • Low: 67 °
  • Partly Cloudy

Forecast for Alton, Illinois

Updated: 1:00 AM CDT on January 28, 2015

  • Friday

    Intervals of clouds and sunshine. High 84F. Winds SSE at 10 to 15 mph.

  • Friday Night

    A stray shower or thunderstorm is possible early. Partly cloudy during the evening followed by cloudy skies overnight. Low 63F. Winds S at 5 to 10 mph.

  • Saturday

    More clouds than sun. A stray shower or thunderstorm is possible. High around 85F. Winds SW at 5 to 10 mph.

  • Saturday Night

    Cloudy skies early will become partly cloudy later at night. Low near 65F. Winds light and variable.

  • Sunday

    Sunshine and clouds mixed. High 87F. Winds light and variable.

  • Sunday Night

    Mostly clear skies. Low 64F. Winds light and variable.

  • Monday

    Sunny skies. High near 90F. Winds SSW at 5 to 10 mph.

  • Monday Night

    Clear to partly cloudy. Low near 65F. Winds light and variable.

  • Tuesday

    Intervals of clouds and sunshine. High near 90F. Winds S at 5 to 10 mph.

  • Tuesday Night

    Mostly clear skies. Low 67F. Winds light and variable.

  • Wednesday

    Partly cloudy skies. High 92F. Winds SSW at 5 to 10 mph.

  • Wednesday Night

    Clear skies. Low 66F. Winds light and variable.

  • Thursday

    Plentiful sunshine. High near 90F. Winds SSE at 5 to 10 mph.

  • Thursday Night

    A mostly clear sky. Low 67F. Winds light and variable.

  • Friday

    Sunny. High near 90F. Winds ENE at 5 to 10 mph.

  • Friday Night

    Clear skies. Low 67F. Winds light and variable.

  • Saturday

    A mainly sunny sky. High near 90F. Winds ENE at 5 to 10 mph.

  • Saturday Night

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

  • Sunday

    Scattered thunderstorms. High 89F. Winds ENE at 5 to 10 mph. Chance of rain 60%.

  • Sunday Night

    Scattered thunderstorms during the evening, then partly cloudy overnight. Low 67F. Winds ESE at 5 to 10 mph. Chance of rain 60%.

  • Monday

    A few clouds early, otherwise mostly sunny. High 88F. Winds S at 5 to 10 mph.

  • Monday Night

    Partial cloudiness early, with scattered showers and thunderstorms later during the night. Low 67F. Winds light and variable. Chance of rain 40%.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Alton Amtrak, Alton, IL

Updated: 2:24 AM CDT

Temperature: 59.5 °F Dew Point: 59 °F Humidity: 99% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Graphs

Location: Alton - Beacon, Alton, IL

Updated: 2:25 AM CDT

Temperature: 64.0 °F Dew Point: 61 °F Humidity: 89% Wind: Calm Pressure: 30.07 in Hourly Precipitation: 0.00 in Graphs

Location: Alton - Christian Hill Area, Alton, IL

Updated: 2:25 AM CDT

Temperature: 63.4 °F Dew Point: 60 °F Humidity: 89% Wind: Calm Pressure: 30.05 in Hourly Precipitation: 0.00 in Graphs

Location: Milton Road, Alton, IL

Updated: 2:24 AM CDT

Temperature: 59.4 °F Dew Point: 58 °F Humidity: 95% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Graphs

Location: Alton - Rock Gate Estates, Alton, IL

Updated: 2:25 AM CDT

Temperature: 60.1 °F Dew Point: 59 °F Humidity: 97% Wind: Calm Pressure: 30.08 in Hourly Precipitation: 0.00 in Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 2:19 AM CDT

Temperature: 59.5 °F Dew Point: 58 °F Humidity: 96% Wind: Calm Pressure: 30.03 in Hourly Precipitation: 0.00 in Graphs

Location: Chelsea Court, Godfrey, IL

Updated: 2:25 AM CDT

Temperature: 58.5 °F Dew Point: 56 °F Humidity: 92% Wind: Calm Pressure: 29.45 in Hourly Precipitation: 0.00 in Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 2:20 AM CDT

Temperature: 58.6 °F Dew Point: 58 °F Humidity: 99% Wind: Calm Pressure: 29.95 in Hourly Precipitation: - Graphs

Location: Godfrey River Aire Subdivision, Godfrey, IL

Updated: 2:25 AM CDT

Temperature: 59.0 °F Dew Point: 58 °F Humidity: 96% Wind: Calm Pressure: 30.05 in Hourly Precipitation: 0.00 in Graphs

Location: Wood River (West End), Wood River, IL

Updated: 2:13 AM CDT

Temperature: 61.0 °F Dew Point: 57 °F Humidity: 88% Wind: Calm Pressure: 29.75 in Hourly Precipitation: - Graphs

Location: Rosewood Heights, East Alton, IL

Updated: 2:25 AM CDT

Temperature: 61.5 °F Dew Point: 58 °F Humidity: 89% Wind: Calm Pressure: 30.02 in Hourly Precipitation: 0.00 in Graphs

Location: Wood River (East End), Wood River, IL

Updated: 2:14 AM CDT

Temperature: 62.8 °F Dew Point: 59 °F Humidity: 87% Wind: Calm Pressure: 30.01 in Hourly Precipitation: - Graphs

Location: Whispering Oaks Drive, Bethalto, IL

Updated: 2:15 AM CDT

Temperature: 61.7 °F Dew Point: 55 °F Humidity: 79% Wind: North at - Pressure: 30.20 in Hourly Precipitation: - Graphs

Location: The Landing at Old Jamestown, Florissant, MO

Updated: 2:24 AM CDT

Temperature: 63.1 °F Dew Point: 61 °F Humidity: 94% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Graphs

Location: Jersey County along IL 111, Brighton, IL

Updated: 2:24 AM CDT

Temperature: 60.1 °F Dew Point: 56 °F Humidity: 87% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 2:20 AM CDT

Temperature: 57.2 °F Dew Point: 56 °F Humidity: 96% Wind: Calm Pressure: 30.08 in Hourly Precipitation: 0.00 in Graphs

Location: Riverside at Albers Pointe, Florissant, MO

Updated: 2:23 AM CDT

Temperature: 61.9 °F Dew Point: 57 °F Humidity: 88% Wind: North at - Pressure: 30.06 in Hourly Precipitation: - Graphs

Location: Alber Pointe Drive, Florissant, MO

Updated: 2:15 AM CDT

Temperature: 61.9 °F Dew Point: 58 °F Humidity: 88% Wind: North at - Pressure: 30.06 in Hourly Precipitation: 0.00 in Graphs

Location: Fox Lake Meadows, Florissant, MO

Updated: 2:13 AM CDT

Temperature: 57.7 °F Dew Point: 57 °F Humidity: 97% Wind: Calm Pressure: 30.04 in Hourly Precipitation: - Graphs

Location: Southland Estates, Jerseyville, IL

Updated: 2:24 AM CDT

Temperature: 59.2 °F Dew Point: 59 °F Humidity: 98% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.00 in Graphs

Location: Riverwood Place, Florissant, MO

Updated: 2:25 AM CDT

Temperature: 62.8 °F Dew Point: 61 °F Humidity: 93% Wind: Calm Pressure: 30.09 in Hourly Precipitation: 0.00 in Graphs

Location: 27th Street, Granite City, IL

Updated: 2:15 AM CDT

Temperature: 69.3 °F Dew Point: 61 °F Humidity: 75% Wind: North at - Pressure: 30.14 in Hourly Precipitation: 0.00 in Graphs

Location: Steven Drive, Bunker Hill, IL

Updated: 2:25 AM CDT

Temperature: 60.6 °F Dew Point: 59 °F Humidity: 93% Wind: North at - Pressure: 29.39 in Hourly Precipitation: - Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 2:25 AM CDT

Temperature: 60.7 °F Dew Point: 60 °F Humidity: 97% Wind: Calm Pressure: 30.06 in Hourly Precipitation: 0.00 in Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 2:22 AM CDT

Temperature: 63.3 °F Dew Point: 59 °F Humidity: 87% Wind: Calm Pressure: 30.03 in Hourly Precipitation: - Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 2:25 AM CDT

Temperature: 59.9 °F Dew Point: 59 °F Humidity: 96% Wind: Calm Pressure: 30.07 in Hourly Precipitation: 0.00 in Graphs

Location: Kelly Greens Weather Station, Edwardsville, IL

Updated: 2:24 AM CDT

Temperature: 59.2 °F Dew Point: 59 °F Humidity: 98% Wind: Calm Pressure: 30.08 in Hourly Precipitation: 0.00 in Graphs

Location: Birmingham Drive, Glen Carbon, IL

Updated: 2:15 AM CDT

Temperature: 64.9 °F Dew Point: 56 °F Humidity: 72% Wind: North at - Pressure: 30.16 in Hourly Precipitation: - Graphs

Location: Stonebridge Farms, Maryville, IL

Updated: 2:25 AM CDT

Temperature: 61.0 °F Dew Point: 58 °F Humidity: 91% Wind: SE at 2.0 mph Pressure: 30.09 in Hourly Precipitation: 0.00 in Graphs

Location: Barbarotto Compound, Maryville, IL

Updated: 2:25 AM CDT

Temperature: 60.1 °F Dew Point: 58 °F Humidity: 93% Wind: ESE at 1.0 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in 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 
1205 am CDT Friday Aug 28 2015 


Short term: (through late tonight) 
issued at 251 PM CDT Thursday Aug 27 2015 


Thunderstorms over northwest Missouri have begun to diminish at 
midday in areal coverage as low level moisture convergence has 
diminished in response to low level jet backing. Believe that our 
area will stay dry through most of the night with the exception of 
the far northwestern part of the area late tonight. By late tonight 
weak shortwave trough now moving across Central High plains will 
move east supplying ascent that will eventually move into northern 
Missouri after midnight. This ascent in addition to the level jet 
which will veer again and will provide additional low level 
convergence underneath the ascent that will be enough for 
thunderstorm development later this evening and overnight over Iowa 
and northern Missouri. So will maintain a slight chance of 
thunderstorms late tonight over northeast Missouri. 


A compromise of MOS guidance looks reasonable given that they are 
close to current dewpoints with cloud cover already moving over the 
area. 


Britt 


Long term: (friday through next thursday) 
issued at 253 PM CDT Thursday Aug 27 2015 


Showers and storms will likely move through parts of northeast and 
central MO and west central Illinois...north and west of stl on Friday as 
a southwesterly low level jet brings increasing low level moisture 
into this area ahead of an approaching upper level trough over 
the northern plains and its associated surface low moving eastward 
through western Iowa along with its trailing cold front. The threat 
for convection may shift as far southeastward as the stl area by 
12z Saturday as the surface low moves eastward through eastern Iowa 
and drags the cold front into the northwestern portion of our 
forecast area. The convergence along the cold front will weaken as 
it moves slowly southeastward through our forecast area Saturday 
and Saturday night as the upper level trough moves eastward 
through the Great Lakes region. The NAM model seems a little too 
slow with the progression of the upper trough and associated cold 
front and may be a little too strong. Its probability of precipitation and quantitative precipitation forecast may also 
be too high for Friday night through Saturday night. Prefer the 
model solutions of the European model (ecmwf) and GFS which have lighter and more 
scattered quantitative precipitation forecast for Saturday and Saturday night. Will reduce the 
probability of precipitation into the slight chance catagory across southeast MO and 
southwest Illinois by late Saturday night and Sunday along and ahead of 
the weak cold front and a weak upper level trough...shear axis. 
Any noticeable cooling behind this front will be mainly across 
northeast MO Saturday and Saturday night. The models try to build 
an upper level ridge northeastward into northern MO for the next 
work week with weak upper level troughing or a shear axis 
remaining near southeast MO and southwest Illinois. Surface and low 
level winds will be mainly southeasterly/southerly with surface 
and 850 mb ridging east or southeast of the area. Temperatures 
should be slightly above normal. Will keep the forecast dry from 
Sunday night through the remainder of the extended forecast... 
although could not rule out a few showers/storms mainly across 
southeast MO/southwest Illinois near weak upper level lows/troughing 
..shear axis. 


Gks 


&& 


Aviation: (for the 06z tafs through 06z Friday night) 
issued at 1200 am CDT Friday Aug 28 2015 


Except for some River Valley fog between 28/06z and sunrise 
(especially at ksus where T-dew point spreads have already fallen to 1 
degree), VFR conditions are expected to prevail for the majority 
of the taf period. There is a chance of sh/ts late in the taf 
period (after 29/03z) ahead of an approaching cold front, but 
confidence in the timing/coverage is too low to include in the 
tafs at this time. Winds will remain out of the southeast to south. 


Kanofsky 


&& 


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


$$ 


Weather forecast office lsx 



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