Chicago Weather Forecast (O'Hare Official) 10:16 pm CDT Aug 8, 2017 with Forecast Discussion

Tonight: Mostly clear, with a low around 62. Calm wind.

Wednesday: Mostly sunny, with a high near 83. South southwest wind around 5 mph.

Wednesday Night: Partly cloudy, with a low around 64. East wind around 5 mph becoming south after midnight.

Thursday: Partly sunny, with a high near 83. South wind 5 to 10 mph.

Thursday Night: A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 65. South southwest wind 5 to 10 mph. Chance of precipitation is 30%.

Friday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 80.

Friday Night: Partly cloudy, with a low around 62.

Saturday: Mostly sunny, with a high near 78.

Saturday Night: Partly cloudy, with a low around 60.

Sunday: Mostly sunny, with a high near 78.

Sunday Night: Mostly clear, with a low around 61.

Monday: Sunny, with a high near 79.

Monday Night: Mostly clear, with a low around 62.

Tuesday: Sunny, with a high near 81.

Area Forecast Discussion below ad ...

National Weather Service Chicago/Romeoville, IL
GO Current Forecast Discussion


630 PM CDT Tue Aug 8 2017


Through Wednesday...

High pressure centered over west central Illinois this afternoon will be in control, continuing the quiet weather conditions as the high shifts slowly east on Wednesday. Fair weather Cumulus will dissipate this evening, with just passing high clouds overnight into early Wednesday, followed by the Cu returning mid to late Wednesday morning. Early morning low temperatures should be a bit milder than Tuesday`s, followed by similar high temperatures to today, with progged 925 mb temperatures again in the upper teens Celsius. A lake breeze will keep shore areas slightly cooler once again.




Wednesday night through Tuesday...

Broad upper-level troughing is expected to dominate across much of the Great Lakes Region through the period. This is likely to result in near, to below average temperatures, with highs mainly in the mid to upper 70s from Friday into early next week. This cooler airmass will follow a cold frontal passage Thursday night. This cold front, and an associated mid-level disturbance may also produce a few showers, and possibly a thunderstorm, especially late Thursday into Thursday night as it approaches the area. However, following this system there will be little chance of appreciable rain (aside from a passing shower or two over the weekend) through the rest of the period as dry and cool high pressure settles over the area through the weekend.



.AVIATION... For the 00Z TAFs...

Quiet aviation weather conditions expected to continue through the TAF period.

Surface high pressure centered over northern IL early this evening will drift slowly east through Wednesday. VFR conditions and light winds expected to persist. In the near-term, lake breeze boundary had pushed through MDW and GYY earlier, and wast 3-4 NM east of ORD at 2330Z. Expect the lake breeze to continue to drift west across ORD early this evening, though with little push and east- southeast winds less than 10 kts developing briefly behind it.

On Wednesday, similar conditions are expected, though with perhaps a slightly earlier lake breeze passage and a more southeasterly wind direction expected behind it.




High pressure over the Southern Lakes Region and into the Ohio Valley will continue to produce a westerly wind across much of the lake into Wednesday. Thereafter, expect winds to turn southerly in response to low pressure moving over the Upper- Midwest. This low is expected to shift over the lake Thursday night into Friday morning. Expect northerly flow to return over the lake in the wake of this front. Another surface high is then likely to set up over the lakes region again later in the weekend and into early next week.




+ + + + + +

Important links below ad ...
NWS Forecast Chicago (O'Hare)
(NEXRAD Radar Chicago)
(Chicagoland Weather Radar)
(Satellite Cloud Cover East United States)
(US Weather Forecast Chart)
Ultraviolet Index/UV Index
Chicagoland Sunrise, Sunset and Solar Information for Chicago area
Chicagoland Moonrise, Moonset and Lunar Phase information for Chicago area

Full climate/weather details
(Desktop Mac/PC links)

Chicago record high temperatures

Chicago record low temperatures

Chicago extreme records

Chicago normal temperatures

Chicago Weather Radar

Chicago Weather Forecast

See also ...
Arlington Heights Weather Forecast
Chicago allergy weather
Chicago arthritis weather
Chicago respiratory weather

Much of the information in, Chicago Weather Stations and Chicago Weather Station consists of material from the National Weather Service, which is in the public domain (See ABOUT section).