Peotone Weather

National Weather Service Forecast for: Peotone, IL Issued by: National Weather Service Chicago/Romeoville, IL

Updated: Mon, 06-Jul-2026 12:00am CDT

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Peotone, IL

Monday Sunny Tuesday Sunny Wednesday Sunny Thursday Chance Showers And T-Storms Friday Chance Rain Showers Saturday Slight Chance Rain Showers then Slight Chance Showers And T-Storms Sunday Slight Chance Rain Showers then Mostly Sunny   Hi 79 °F Hi 83 °F Hi 85 °F Hi 85 °F Hi 81 °F Hi 82 °F Hi 84 °F   Overnight Partly Cloudy Monday Night Mostly Clear Tuesday Night Mostly Clear Wednesday Night Partly Cloudy Thursday Night Showers And T-Storms Likely Friday Night Chance Showers And T-Storms Saturday Night Slight Chance Showers And T-Storms   Lo 64 °F Lo 61 °F Lo 60 °F Lo 65 °F Lo 64 °F Lo 61 °F Lo 62 °F

Forecast from NOAA-NWS for Peotone, IL.

015
FXUS63 KLOT 060533
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1233 AM CDT Mon Jul 6 2026

.KEY MESSAGES...

- Drier and more seasonable conditions are expected the next few
  days before shower and storm chances return late week.

&&

.DISCUSSION...
Issued at 152 PM CDT Sun Jul 5 2026

Early this afternoon, we`re finding a cluster of light to
moderate showers stirring over the lake. This cluster was
brought on by a vort lobe spinning over the southern end of the
lake about the back end of the departing trough. Notably weak
convective layer shear isn`t helping move these showers along
very well as they track toward the south at near or less than 10
mph. Latest radar trends suggest that this activity should
target portions of northwest Indiana within the next couple of
hours. However, the southern extent of the showers has been
fizzling away as of late and they may even fail to survive to
the shore.

Coverage of isolated to widely scattered showers is anticipated
to blossom and spread inland away from the lake as we progress
through the afternoon, especially near and south of I-80. The
greatest forcing tied to this vort will focus over the southern
half of the CWA and a northeasterly low level wind field will
continue to spread cooler, more stable low level air inland from
the lake. Meanwhile, instability continues to build across
outlying areas with several hundred to around 1,000 Joules of
largely uncapped MLCAPE south of I- 80 and especially south of
the Kankakee River expected for the mid-late afternoon. Latest
CAM guidance generally favors areas near/south of the Kankakee
River during the latter half of the afternoon and into early
evening for the highest (still widely scattered) precip
coverage. A handful of thunderstorms will be possible down in
these parts as well. The limited instability and weak shear will
inhibit a severe threat. However, the plentiful moisture, poor
shear, and limited forcing beyond the low levels could make for
slow-moving low-echo centroid pockets of heavy rainfall. Should
a heavier shower or storm linger over an area that saw lots of
rain or any flooding over the past few days, minor flooding
impacts could be reinvigorated, although this is a low and
isolated potential.

Farther north up into the Chicago metro and west of the
lakeshore, the environment appears most supportive of precip as
of this writing during the early part of the afternoon than
later in the day. The footprint of the vort looks to spread
inland carrying the better large scale forcing farther south for
the mid-late afternoon. An isolated thunderstorm can`t be ruled
out north of I-80, but the odds are best prior to 3-4 PM.
Additionally, a secondary vort ejecting east out of Iowa may
help churn some additional shower activity farther west out
toward I-39 where a handful of CAMs are resolving isolated
pockets, mainly during the latter part of the day. Latest
satellite trends show no distinct signs of new development
anywhere around the area so it may end up being more of a late
afternoon show, which adds confidence to there being little to
no impacts north of I-80. Whatever precip coverage does
materialize should wrap up by mid-evening as the trough axis
moves across stripping forcing and moisture from the area.

Broad, relative high pressure behind the departing system will
bring dry and mostly sunny conditions to Monday and Tuesday.
Highs are forecast in the lower 80s for Monday and mid 80s on
Tuesday. Onshore winds both days, however, will bring noticeably
cooler conditions to locales near the lake with afternoon temps
forecast in the lower and middle 70s around the lakeshore. The
vort lobe from today will get hung up across central IL and
central IN tomorrow and a handful of camps resolve pockets of
daytime showers and thunderstorms similar to today but confined
to our far southeastern CWA, if not outside of the CWA entirely.
Couldn`t argue with the NBM wanting to introduce some slight
chances for storm or two down there tomorrow. Mid-summer heat
will remain through the middle of the week with another synoptic
system favored to traverse the region during the mid-late week
period bringing additional opportunities for rain and
thunderstorms.

Doom

&&

.AVIATION /06Z TAFS THROUGH 12Z TUESDAY/...
Issued at 1233 AM CDT Mon Jul 6 2026

Key aviation forecast messages:

- IFR CIGs ongoing at GYY (may try to expand toward MDW)

An area of IFR to low-end MVFR stratus has developed over GYY
early this morning. Have held off on a formal mention at MDW
but will monitor trends closely over the next few hours in case
it expands farther northwest. SCT to briefly BKN MVFR CIGs can`t
be ruled out at times prior to daybreak at any of the Chicago
area terminals but expect mainly VFR conditions to prevail.

Winds remain light out of the NNE around 5-10 kt across the
Chicago metro with variable winds < 5 kt at RFD. Expect winds
to increase out of the northeast after daybreak today to around
10-15 kt. Winds then ease and become light and variable after
sunset (potentially leaning NNW at ORD/MDW < 5 kt.

Petr

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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