Peotone Weather

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

Updated: Fri, 13-Feb-2026 8:56pm CST

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Peotone, IL

Saturday Patchy Fog then Partly Sunny Sunday Sunny Washington's Birthday Partly Sunny Tuesday Mostly Cloudy Wednesday Chance Rain Showers Thursday Chance Rain Showers Friday Slight Chance Rain   Hi 54 °F Hi 57 °F Hi 61 °F Hi 55 °F Hi 62 °F Hi 51 °F Hi 44 °F   Tonight Mostly Clear then Patchy Fog Saturday Night Mostly Cloudy Sunday Night Partly Cloudy Monday Night Mostly Cloudy Tuesday Night Chance Rain Showers Wednesday Night Slight Chance Rain Showers Thursday Night Chance Rain   Lo 28 °F Lo 33 °F Lo 36 °F Lo 40 °F Lo 47 °F Lo 36 °F Lo 35 °F

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

275
FXUS63 KLOT 132333
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
533 PM CST Fri Feb 13 2026

.KEY MESSAGES...

- Above average temperatures continue through mid next week.

- Low chance of rain (30%) Saturday night, mainly S of US-24.

- Precipitation chances return toward the middle of next week
  (30-50%).

&&

.DISCUSSION...
Issued at 242 PM CST Fri Feb 13 2026

The early spring-like weather pattern we`ve entered will persist
through next workweek. This will favor above to at times well
above normal temperatures (as we`ve seen today/Friday), but with
variability in the details, along with periods of notable lake
cooling.

Tonight through Saturday Night:

Plenty of sunshine and deeper mixing than had been shown on most
forecast soundings resulted in a dry, breezy, and mild afternoon.
Despite temps in the lower to mid 50s, dew points in the 20s
should be telling in terms of another night of good radiational
cooling. It certainly won`t be quite as chilly as early this
(Friday) morning, but localized mid 20s in outlying areas are a
decent bet amidst otherwise upper 20s-low 30s outside of Chicago
and mid 30s near downtown. Given that there was some reduced
visibility in light ground fog early this morning, opted to add
patchy fog mention into early Saturday morning away from Chicago
due to forecast lows near or below the afternoon crossover
temps.

On Saturday, light-variable winds in the morning, will support
quick lake breeze development and propagation inland by the
early afternoon. After initial warming prior to the lake breeze,
temperatures will drop through the 40s and even into the upper
30s prior to sunset near the lake. Away from the lakeshore, our
forecast highs are similar to those of Friday, with some upside
potential if mid and high clouds moving in from the south don`t
filter out the sunshine too much.

A southern stream short-wave will track well south of our area
Saturday night. Rain on the northern periphery of the system
would reach into areas well south of I-80 (primarily near/south
of the US Route 24) Saturday evening and overnight if the still
consistently farther north ECMWF/EPS mean solution comes to
fruition. Meanwhile, most of the remainder of the guidance has
continued to favor even southern sections remaining dry. Even in
a EC/EPS scenario, there likely would be a very sharp cut-off
north of wherever the northern periphery of the rain sets up. As
such, a gradient from ~30-40% PoPs south of US-24 to less than
10% near/north of I-80 appears reasonable.

Sunday through Thursday:

Sunday will be another unseasonably mild day away from Lake
Michigan, reaching the mid and upper 50s to locally around 60F.
A lake breeze shifting inland during the mid to late afternoon
will limit highs some near the lake, followed by steady cooling
into the 40s behind the lake breeze passage. After a quiet and
mild Sunday night (mid-upper 30s), Monday looks quite mild
based on progged 925 mb to 850 mb temps. Mid and high cloud
cover may initially keep the pace of warming in check, but then
it does appear that skies should clear early enough to support
highs in the upper 50s to lower 60s (more than 20F above
average) along with modestly breezy southwest winds. For
reference, the current record high for Feb 16th is 58 degrees
in Chicago and 57 degrees in Rockford, both set in 1921.

A backdoor cold front trailing from weak low pressure well to
our northeast should shift southward Monday night into Tuesday,
taking on backdoor characteristics in the process. There has
been an overall trend toward the backdoor front making it
farther south, though not as far south as the consistent
ECMWF/EPS depiction. Nudged temperatures in the direction of the
EC scenario, resulting in nearly 20 degrees colder than Monday
near the lakeshore. The inland extent of lake cooling will be
determined by how far south the front is able to progress before
stalling out. There should be a gradient in temps for inland
areas, with the warmest readings in the far south and southwest
sections of the CWA.

The main sensible weather of interest next week will come
Tuesday night through Thursday as trough ejection from the
southwest results in broad lee cyclogenesis over the central and
northern High Plains. As is to be expected, there`s still
plenty of uncertainty regarding the specific evolution of key
features at the surface and aloft. The position and trajectory
of the dominant/consolidated surface low will determine how much
of the area temporarily gets into the exceptionally mild warm
sector on Wednesday (highs well into the 60s). Precipitation-
wise, showers (with a non-zero chance for elevated convection)
are possible near or north of the system warm front Tuesday
night into Wednesday morning. The cutoff south of stratiform
precip over Wisconsin may be quite sharp.

A cold front should move across the area sometime on Wednesday,
knocking temps down on Thursday, particularly near the lake.
Details are quite muddy late in the workweek, with a signal for
a follow-up short-wave arriving sometime Thursday-Thursday
night. Note that any deeper synoptic system later next week will
likely have well above average moisture content to work with,
problematic for any areas that see heavy rain on top of thawing
out but still frozen ground. While there`s plenty of spread in
the range of plausible solutions, an overall increased signal
for precip resulted in PoPs jumping to 40-50%. Thermal profiles
on most guidance members primarily point towards rain as the
p-type, but at this range, certainly can`t rule out wintry
precip within the CWA, especially with northward extent. Friday
will feature breezy northwest winds and cooler temps, but likely
still above average for the date (Feb 20th).

Castro

&&

.AVIATION /00Z TAFS THROUGH 06Z SUNDAY/...
Issued at 533 PM CST Fri Feb 13 2026

Winds have become light southwest across the terminals with
sunset, and this will persist through this evening before
becoming light/variable later tonight into Saturday morning.
Winds should remain light and variable through midday Saturday,
before an easterly lake breeze develops and pushes west across
ORD and MDW mid-late afternoon (early afternoon for GYY). Winds
then should become light southeast or south-southeast later
Saturday evening.

With the light winds and mostly clear skies tonight, strong
radiational cooling will likely lead to some patchy shallow fog
development toward sunrise away from the core of the Chicago
metro area. Not expecting widespread coverage of fog, and
guidance continues to indicate that primarily RFD/DPA could
see some patchy fog from 09-10Z through sunrise. Have
maintained a TEMPO for MVFR vis in BR and a MIFG mention for
those two sites. Otherwise, VFR conditions are expected through
the period, with a thickening mid/high deck generally above 10
kft Saturday and Saturday night.

Ratzer

&&

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

&&

$$

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