Alton, Illinois Weather Conditions

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Current Conditions

  • 34°
  • Partly Cloudy
  • Wind: East 10 mph
  • Humidity: 52%
  • Visibility: 10.0 miles
  • Dew Point: 18°
  • Pressure: 30.35 in. +
  • Heat Index: 26

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Next 12 Hours

11  am
2  pm
5  pm
8  pm
11  pm
Partly Cloudy
Partly Cloudy
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
36°
41°
43°
37°
32°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Saturday
  • Partly Cloudy
  • High: 45 °
  • Low: 30 °
  • Partly Cloudy
  • Sunday
  • Chance of Rain
  • High: 57 °
  • Low: 36 °
  • Chance of Rain
  • Monday
  • Clear
  • High: 65 °
  • Low: 43 °
  • Clear
  • Tuesday
  • Clear
  • High: 69 °
  • Low: 43 °
  • Clear
  • Wednesday
  • Clear
  • High: 70 °
  • Low: 57 °
  • Clear

Forecast for Alton, Illinois

Updated: 7:17 AM CDT on January 28, 2015

  • Saturday

    Some clouds this morning will give way to generally sunny skies for the afternoon. High around 45F. Winds ESE at 5 to 10 mph.

  • Saturday Night

    A clear sky. Low around 30F. Winds SE at 5 to 10 mph.

  • Sunday

    Showers, with winds diminishing in the afternoon. Thunder possible. High 57F. Winds SSW at 20 to 30 mph. Chance of rain 50%.

  • Sunday Night

    Some clouds early will give way to generally clear conditions overnight. Low 36F. Winds WNW at 10 to 15 mph.

  • Monday

    Except for a few afternoon clouds, mainly sunny. High around 65F. Winds W at 5 to 10 mph.

  • Monday Night

    A few clouds. Low 43F. Winds light and variable.

  • Tuesday

    A few clouds from time to time. High 69F. Winds W at 10 to 15 mph.

  • Tuesday Night

    A mostly clear sky. Low 43F. Winds ENE at 5 to 10 mph.

  • Wednesday

    Sunny along with a few clouds. High around 70F. Winds SE at 10 to 15 mph.

  • Wednesday Night

    Variable clouds with showers at times, and perhaps a rumble or two of thunder, especially early. Low 57F. Winds S at 5 to 10 mph. Chance of rain 40%.

  • Thursday

    Scattered thunderstorms in the morning. Partly cloudy skies late. High around 70F. Winds SSW at 10 to 15 mph. Chance of rain 40%.

  • Thursday Night

    A few clouds. Low 51F. Winds S at 5 to 10 mph.

  • Friday

    Rain showers in the morning becoming more intermittent in the afternoon. High 58F. SSW winds shifting to NW at 10 to 20 mph. Chance of rain 40%.

  • Friday Night

    Partly cloudy. Low near 40F. Winds NW at 10 to 15 mph.

  • Saturday

    Sunshine along with some cloudy intervals. High 57F. Winds W at 10 to 20 mph.

  • Saturday Night

    Mostly clear skies. Low 37F. Winds SSE at 5 to 10 mph.

  • Sunday

    Intervals of clouds and sunshine. High around 60F. Winds SSE at 10 to 15 mph.

  • Sunday Night

    Chance of a shower or two during the evening, followed by partly cloudy skies late. Low 46F. Winds SSE at 5 to 10 mph. Chance of rain 30%.

  • Monday

    Partly cloudy. High 64F. Winds S at 10 to 20 mph.

  • Monday Night

    Variable clouds with scattered thunderstorms. Low 52F. Winds S at 10 to 15 mph. Chance of rain 50%.

  • Tuesday

    Scattered showers and thunderstorms. High 68F. Winds SW at 5 to 10 mph. Chance of rain 50%.

  • Tuesday Night

    Rain showers early with clearing later at night. Low 48F. Winds WNW at 5 to 10 mph. Chance of rain 40%.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Alton, IL

Updated: 10:55 AM CDT

Temperature: 36.9 °F Dew Point: 14 °F Humidity: 39% Wind: North at 3.1 mph Pressure: 30.32 in Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: Alton - Beacon, Alton, IL

Updated: 10:58 AM CDT

Temperature: 38.7 °F Dew Point: 23 °F Humidity: 53% Wind: East at 4.0 mph Pressure: 30.35 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Alton - Christian Hill Area, Alton, IL

Updated: 10:55 AM CDT

Temperature: 36.3 °F Dew Point: 19 °F Humidity: 49% Wind: WSW at 1.0 mph Pressure: 30.34 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Alton - Rock Gate Estates, Alton, IL

Updated: 10:58 AM CDT

Temperature: 34.7 °F Dew Point: 24 °F Humidity: 66% Wind: Calm Pressure: 30.34 in Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 10:45 AM CDT

Temperature: 36.0 °F Dew Point: 18 °F Humidity: 48% Wind: SE at 3.0 mph Pressure: 30.33 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 10:50 AM CDT

Temperature: 39.9 °F Dew Point: 22 °F Humidity: 48% Wind: Calm Pressure: 30.22 in Hourly Precipitation: - Windchill: 40 °F Graphs

Location: WEST ALTON, West Alton, MO

Updated: 10:50 AM CDT

Temperature: 34.3 °F Dew Point: - Humidity: 67% Wind: North at - Pressure: - Hourly Precipitation: - Windchill: 34 °F Graphs

Location: Godfrey River Aire Subdivision, Godfrey, IL

Updated: 10:59 AM CDT

Temperature: 35.4 °F Dew Point: 21 °F Humidity: 55% Wind: East at 2.0 mph Pressure: 30.33 in Hourly Precipitation: 1.26 in Windchill: 35 °F Graphs

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

Updated: 10:58 AM CDT

Temperature: 43.5 °F Dew Point: 21 °F Humidity: 40% Wind: West at 1.7 mph Pressure: 30.06 in Hourly Precipitation: - Windchill: 44 °F Graphs

Location: Rosewood Heights, East Alton, IL

Updated: 10:58 AM CDT

Temperature: 35.5 °F Dew Point: 16 °F Humidity: 45% Wind: NE at 1.0 mph Pressure: 30.34 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Whispering Oaks Drive, Bethalto, IL

Updated: 10:56 AM CDT

Temperature: 39.2 °F Dew Point: 28 °F Humidity: 63% Wind: North at - Pressure: 30.45 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: Foster Township, Alton, IL

Updated: 10:15 AM CDT

Temperature: 35.8 °F Dew Point: 23 °F Humidity: 60% Wind: ESE at 3.7 mph Pressure: 30.31 in Hourly Precipitation: - Windchill: 33 °F Graphs

Location: Jersey County along IL 111, Brighton, IL

Updated: 10:58 AM CDT

Temperature: 37.9 °F Dew Point: 25 °F Humidity: 59% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 10:55 AM CDT

Temperature: 33.9 °F Dew Point: 23 °F Humidity: 63% Wind: NNE at 4.0 mph Pressure: 30.37 in Hourly Precipitation: 0.00 in Windchill: 30 °F Graphs

Location: Bethalto, IL

Updated: 10:59 AM CDT

Temperature: 35.4 °F Dew Point: -16 °F Humidity: 10% Wind: North at 3.8 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: 32 °F Graphs

Location: Riverside at Albers Pointe, Florissant, MO

Updated: 10:44 AM CDT

Temperature: 35.8 °F Dew Point: 24 °F Humidity: 68% Wind: North at - Pressure: 30.30 in Hourly Precipitation: - Windchill: 36 °F Graphs

Location: Alber Pointe Drive, Florissant, MO

Updated: 10:55 AM CDT

Temperature: 35.6 °F Dew Point: 25 °F Humidity: 64% Wind: North at - Pressure: 30.32 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Jost Farm, Florissant, MO

Updated: 10:35 AM CDT

Temperature: 39.9 °F Dew Point: 20 °F Humidity: 45% Wind: East at 7.6 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: Grand Ave, Edwardsville, IL

Updated: 10:58 AM CDT

Temperature: 42.4 °F Dew Point: 22 °F Humidity: 44% Wind: Calm Pressure: 30.47 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Riverwood Place, Florissant, MO

Updated: 10:59 AM CDT

Temperature: 37.9 °F Dew Point: 22 °F Humidity: 52% Wind: East at 2.0 mph Pressure: 30.38 in Hourly Precipitation: 0.02 in Windchill: 38 °F Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 10:55 AM CDT

Temperature: 35.1 °F Dew Point: 21 °F Humidity: 56% Wind: East at 1.0 mph Pressure: 30.36 in Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 10:44 AM CDT

Temperature: 37.9 °F Dew Point: 22 °F Humidity: 53% Wind: SSE at 2.7 mph Pressure: 30.32 in Hourly Precipitation: - Windchill: 38 °F Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 10:46 AM CDT

Temperature: 36.3 °F Dew Point: 22 °F Humidity: 56% Wind: East at 3.0 mph Pressure: 30.36 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Birmingham Drive, Glen Carbon, IL

Updated: 10:55 AM CDT

Temperature: 34.7 °F Dew Point: 24 °F Humidity: 64% Wind: North at - Pressure: 30.38 in Hourly Precipitation: - Windchill: 35 °F Graphs

Location: Prairie Manor, Edwardsville, IL

Updated: 10:58 AM CDT

Temperature: 33.1 °F Dew Point: 14 °F Humidity: 45% Wind: SE at 4.5 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: 29 °F Graphs

Location: Stonebridge, Maryville, IL

Updated: 10:59 AM CDT

Temperature: 35.2 °F Dew Point: 20 °F Humidity: 53% Wind: ESE at 6.9 mph Pressure: 30.36 in Hourly Precipitation: 0.00 in Windchill: 29 °F Graphs

Location: Barbarotto Compound, Maryville, IL

Updated: 10:59 AM CDT

Temperature: 38.0 °F Dew Point: 25 °F Humidity: 59% Wind: SE at 8.0 mph Pressure: 30.29 in Hourly Precipitation: 0.00 in Windchill: 32 °F Graphs

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

Updated: 10:59 AM CDT

Temperature: 36.4 °F Dew Point: 21 °F Humidity: 54% Wind: East at 2.0 mph Pressure: 30.38 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Rolling Meadows Dr, Maryville, IL

Updated: 10:59 AM CDT

Temperature: 41.0 °F Dew Point: 20 °F Humidity: 42% Wind: SSE at 1.1 mph Pressure: 29.68 in Hourly Precipitation: 0.00 in Windchill: 41 °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 
640 am CDT Sat Mar 28 2015 


Short term: (through late this afternoon) 
issued at 352 am CDT Sat Mar 28 2015 


Focus this morning will be on the potential for accumulating snow... 
primarily across central MO. Widespread cloudiness has moved into 
the area overnight in advance of a short wave dropping southeast in the northwest 
flow. Not much sfc reflection to this feature with most of the 
forcing coming from the mid levels. Radar not at all impressive at 
0345 with just light returns showing up from wrn Iowa into cntrl MO 
with only a few stations even reporting precip. Models indicate that 
coverage/intensity should gradually increase 9z-12z as the precip 
continues to slide south-southeast. Guidance has shifted the precip axis a 
little further west now showing most of the quantitative precipitation forecast west of the County Warning Area so 
have attempted to tighten up the eastern edge of the going pop fcst. 
That being said...I still believe areas along and west of a Columbia 
to Jeff city line may still get a few tenths of an inch this morning 
before the system rapidly slips south of the area. It appears that 
most of the precip will be in eax and sgf cwas this mrng with the 
system just grazing our common border. Any threat of measurable 
precip should be well south of the forecast area by 18z. The rest of the day 
will feature seasonably cold temps in the 40s which is 10-15 
degrees below average. 


Miller 


Long term: (tonight through friday) 
issued at 352 am CDT Sat Mar 28 2015 


High pressure retreats to the east of the area tonight resulting in 
the onset of low level warm advection. The warm air advection combined with large 
scale ascent associated with a short wave digging through the 
northern plains is expected to produce a band/region of showers in 
advance of the next cold front. Present indications are the 
precipitation will remain just northwest of the County Warning Area through 
daybreak, centered from eastern Iowa into northwest MO. Developing 
southerly flow tonight and increasing clouds will help keep 
temperatures warmer than the chilly readings of early this morning. 
Strong low level warm air advection and ascent with the digging short wave will 
maintain a decent band/region of prefrontal showers spreading across 
the area on Sunday in advance of the front. Current thinking is that 
the increasing southerly flow will help push temperatures above 
freezing before the onset of rain during the morning from northeast 
MO into west central Illinois. Precipitation should have exited the County Warning Area 
by late afternoon with the cold front progressing across the area 
from the afternoon into the early evening. Weak surface high 
pressure dominates Sunday night into Monday in the wake of the 
front, with backing winds on Monday afternoon allowing temperatures 
to warm back towards normal levels. Rather non-descript conditions 
exist Tuesday into Wednesday as the flow aloft deamplifies and 
another weak boundary flirts with the area. Despite this boundary, 
warming low and mid levels should translate into warmer temperatures. 


Confidence in forecast details diminishes quite a bit during the 
later part of the week and beyond as there are some rather big 
differences in the flow aloft in the deterministic models. For 
late next week the main issue is the timing of a late week cold 
front and associated precipitation chances. 


Glass 


&& 


Aviation: (for the 12z tafs through 12z Sunday morning) 
issued at 618 am CDT Sat Mar 28 2015 


Focus continues to be the precip...or there lack of...across 
cntrl MO this mrng. It would appear the models were a bit too 
ambitious with the precip fcst for this system as most echo on radar 
is not reaching the ground. Other than a few isld reports, most of 
what is getting reported is VFR. Guidance still indicates that the 
coverage and intensity of the precip should increase a bit over the 
next few hrs but think that if that does occur, the best forcing 
will be past the terminal by that time. With that in mind, I 
eliminated the prevailing MVFR and replaced it with an MVFR tempo 
with a higher visibility. Other than the weak system this mrng, it is a 
quiet fcst with VFR conditions thru the rest of the prd with light 
east/southeast winds below 10kts. 


Specifics for kstl: 


VFR fcst thru the prd. Weak upper lvl system passing to the west 
this mrng is throwing mid/high clouds across ern MO and SW Illinois. 
These should shift southeast this aftn/evng. East/east-southeast wind today will become 
srly as sfc high pressure moves from Lake Michigan to the Ohio Vly today. 
Winds will increase and become gusty on Sunday as the pressure 
gradient increases in advance of a cold front due in later in the 
day. 


2% 


&& 


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


$$ 


Weather forecast office lsx 



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