Peotone Weather

National Weather Service Forecast for: 2 Miles SE Peotone, IL Issued by: National Weather Service Chicago/Romeoville, IL

Updated: Sat, 21-Mar-2026 3:06pm CDT

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Peotone, IL

This Afternoon Sunny Sunday Mostly Cloudy then Chance Rain Showers Monday Mostly Sunny Tuesday Partly Sunny Wednesday Mostly Cloudy Thursday Chance Rain Showers Friday Slight Chance Rain Showers then Partly Sunny   Hi 77 °F Hi 49 °F Hi 45 °F Hi 57 °F Hi 59 °F Hi 67 °F Hi 45 °F     Tonight Partly Cloudy Sunday Night Chance Rain Showers then Mostly Cloudy Monday Night Partly Cloudy Tuesday Night Mostly Cloudy Wednesday Night Slight Chance Rain Showers Thursday Night Chance Rain Showers Friday Night Partly Cloudy   Lo 48 °F Lo 30 °F Lo 29 °F Lo 40 °F Lo 47 °F Lo 33 °F Lo 28 °F

Forecast from NOAA-NWS for 2 Miles SE Peotone, IL.

890
FXUS63 KLOT 211900
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
200 PM CDT Sat Mar 21 2026

.KEY MESSAGES...

- Mild weather continues this evening, but a cold frontal
  passage early Sunday morning will result in blustery and
  sharply colder and cloudy conditions for Sunday.

- Cooler weather persists on Monday, before temperatures
  moderate into midweek.

&&

.DISCUSSION...
Issued at 200 PM CDT Sat Mar 21 2026

Mid and high level cloud cover will continue to clear the area
this afternoon, fostering a mainly sunny afternoon. Temperatures
this afternoon will top out well into the 70s, if not the low
80s (in some areas) as breezy southwesterly low-level flow
develops in response to the compact surface low tracking into
northern WI. Conditions will also warm through the afternoon
along the Lake Michigan shore as the flow shifts southwesterly.

These unseasonably mild conditions will persist tonight, but
will come to a quick end early Sunday morning as a strong cold
front drops south across the area. In advance of this front,
temperatures will hover in the upper 50s to the low 60s for most
of tonight. However, with the frontal passage around, or a bit
before daybreak Sunday morning, a much colder low-level airmass
will be driven in off of Lake Michigan on gusty (30-35 mph)
north-northeasterly winds. The result will be quickly falling
temperatures into the 40s Sunday morning (afternoon) along and
north (south) of the Illinois and Kankakee rivers. Once
temperatures do drop, do not expect much if any recovery Sunday
afternoon. In fact, the presence of a continual feed of colder
air off of Lake Michigan along with an extensive post frontal
low-level status deck will hold temperatures fairly steady in
the 40s Sunday afternoon (low 40s near the lake). The
possibility also exists for some scattered post frontal showers
during the day.

The cooler weather will persist on Monday as a surface high
shifts into the western Great Lakes. Accordingly, high
temperatures are generally expected to be in the 40s (coolest
near the lake). The main differences from Sunday`s weather will
be the lighter northeasterly winds and less cloud cover for the
day Monday.

Broad WNW mid and upper-level flow will take hold across the
region next week. This will result in a series of weather
disturbances and associated surface cold fronts crossing the
Great Lakes region during the middle and later part of next
week. In advance of these fronts, conditions will warm back well
into the 50s on southwesterly low-level winds on Tuesday.
Thereafter, mild weather does look to persist to some degree for
Wednesday and Thursday. However, a couple of cold fronts may
shift into the area. The first may shift into northern parts of
the area on Wednesday before stalling just south of the lake. If
this occurs, onshore flow north of the boundary would be likely
to promote cooler conditions than currently forecast for
Wednesday, particularly across northeastern IL. Otherwise,
temperatures could easily make a run back around 60F for
Wednesday. Thursday could then end up being the warmest day next
week as a low-level thermal ridge advects over the area in
advance of the next approaching cold front. This second cold
front looks to be more substantial than Wednesday`s.
Accordingly, temperatures are expected to trend back down into
the 40s and low 50s on breezy northeasterly winds at the end of
the week.

Generally dry weather is expected through the period, with only
some low (20-30%) chances of precipitation Sunday, and again
Thursday.

KJB

&&

.AVIATION /18Z TAFS THROUGH 00Z MONDAY/...
Issued at 1156 AM CDT Sat Mar 21 2026

Forecast concerns include...

Gusty southwest winds this afternoon.
Low level wind shear tonight.
Wind shift to northeast early Sunday morning.
Low mvfr, possible ifr, cigs Sunday.
Strong/gusty northeast winds Sunday.

Southerly winds currently will turn to the southwest over the
next few hours with gusts into the lower/mid 20kt range expected
through sunset, when gusts will end and speeds will diminish to
10kts or less. Winds will turn more west/southwest through the
early overnight hours. A strong cold front will then move across
the area in the predawn hours, shifting winds to the north/
northeast. While gusts into the lower 20kts will be possible
after this front moves through, speeds/gusts are expected to
increase further after daybreak Sunday when gusts into the mid/
upper 20kt range will be possible for much of the daylight hours
Sunday. The timing of the wind shift will likely require
additional tweaking once it emerges later tonight.

Westerly low level winds will steadily increase this evening and
continue until the cold front arrives. These winds are expected
to be strong enough for low level wind shear to develop and have
included mention in this forecast.

Overall confidence for cig trends is low with at least mvfr
cigs expected Sunday and ifr cigs possible in the morning. Much
of the guidance is now holding off lower cigs until near
daybreak for the Chicago terminals and is generally low mvfr.
Ifr cigs are still possible, but their duration is uncertain and
for now have maintained ifr cigs, but have delayed their
arrival. There may also be a short period of fog/mist along and
behind the cold front but confidence for fog is also low.

There is a small chance of rain showers from late morning
through mid afternoon Sunday. Confidence is very low and have
maintained a dry forecast. cms

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory from 7 AM Sunday to 1 PM CDT Monday for
     the IL nearshore waters.

     Small Craft Advisory from 10 AM Sunday to 4 PM CDT Monday for
     the IN nearshore waters.

&&

$$

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