Peotone Weather

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

Updated: Wed, 04-Nov-2026 4:46am CST

- Select Forecast - Peotone, IL Manteno, IL Beecher, IL Monee, IL Kankakee, IL Willmington, IL Braidwood, IL Manhattan, IL OakForest, IL Stelle, IL Ottawa, IL Amboy, IL Byron, IL Rockford, IL Quad Cities, IL Champaign/Urbana, IL Peoria, IL Bloomington, IL Springfield, IL Carbondale, IL Vienna, IL Culver, IN

Peotone, IL

Today Scattered Rain Showers then Patchy Drizzle Thursday Mostly Cloudy then Chance Rain Showers Friday Slight Chance Rain Showers then Mostly Cloudy Saturday Mostly Sunny Sunday Sunny Monday Sunny Tuesday Sunny   Hi 64 °F Hi 58 °F Hi 52 °F Hi 52 °F Hi 55 °F Hi 61 °F Hi 62 °F     Tonight Patchy Drizzle then Mostly Cloudy Thursday Night Chance Rain Showers Friday Night Partly Cloudy Saturday Night Mostly Clear Sunday Night Mostly Clear Monday Night Mostly Clear Tuesday Night Partly Cloudy   Lo 47 °F Lo 41 °F Lo 33 °F Lo 31 °F Lo 32 °F Lo 38 °F Lo 36 °F

Forecast from NOAA-NWS for Peotone, IL.

605
FXUS63 KLOT 041204
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
604 AM CST Wed Nov 4 2026

.KEY MESSAGES...

- Periods of scattered showers are expected at times into
  Friday, most notably Thursday and Thursday night.

- Breezy and cooler weather is expected through Friday.

- Potential for freezing temperatures across portions of the
  area Friday and Saturday nights.

&&

.DISCUSSION...
Issued at 256 AM CST Wed Nov 4 2026

Surface low pressure was analyzed just southeast of KMSP as of
1 AM CST, with a trailing cold front extending to its south,
just west of the Mississippi River over far eastern IA/MO.
Aloft, GOES water vapor imagery depicted a strong negative-tilt
short wave lifting northeast across MO toward western IL. Strong
forcing ahead of this wave, combined with moisture advection on
enhanced 45-50 kt 850-500 mb south-southwesterly flow,
continues to produce an area of rain from the lower Ohio Valley
northwest across the region. This area of rain will continue to
shift to the north-northeast, with the trailing edge of the more
organized precipitation along the I-39 corridor eventually
moving east of the forecast area this morning. Though drier mid-
level air will spread across the area, lingering low-level
moisture will likely continue to support the potential for some
patchy light rain or drizzle at times through the day. Strong
south winds sporadically gusting 25-30+ mph ahead of the cold
front overnight have held temperatures in the 60s overnight,
though as winds shift southwest and ease a bit with the cold
frontal passage today, temperatures will gradually fall into the
50s. Lingering cloud cover and breezy southwest winds tonight
will keep temperatures in the 45-50 degree range.

The surface low to our north will only slowly drift northeast
across the northern Great Lakes this afternoon into Thursday, as
it occludes and becomes stacked beneath a slow-moving upper
low/trough. This upper trough will be slow to move east over the
next couple of days, as a series of smaller-amplitude short
waves rotate about. This will maintain the potential for periods
of scattered showers across the area at times, most notably
Thursday into Thursday night, as a secondary cold front pushes
southeast across the area. Highs in the 50s are expected again
Thursday, with temperatures dropping into the upper 30s/low 40s
Thursday night in breezy north flow behind the cold front.

Guidance is in decent agreement in digging a short wave
southward into the upper trough over the Great Lakes region
Thursday night, and developing a new closed upper-level low over
lower MI by early Friday. This looks to reinforce low-level
cold advection across the western Great Lakes region, setting up
lake-effect showers over Lake Michigan and northwest IN Friday
into Friday night, before the upper trough axis shifts
east/southeast, and eventually lowers inversion heights over
the lake. Model ensembles then indicate surface high pressure
builds south across the upper Midwest and Mississippi Valley
Friday night into Saturday. Decreasing cloud cover and
diminishing winds associated with the surface ridge, combined
with sub-zero H8 temps may set the stage for freezing conditions
especially across the IL portion of our CWA late Friday
night/early Saturday morning. Confidence is lower in a freeze
over northwest IN, downstream of the warmer lake and potentially
with some lingering lake-effect clouds. Dry weather is then
expected Saturday/Sunday as the surface continues to drift
southeast. Near average temperatures are forecast (highs in the
50s, lows mainly in the 30s). Ensembles suggest upper ridging
develops into the region early next week, with temperatures
potentially trending slightly above average again Monday-
Tuesday.

Ratzer

&&

.AVIATION /12Z TAFS THROUGH 18Z THURSDAY/...
Issued at 604 AM CST Wed Nov 4 2026

Main Concerns:

- Lower CIGs most of the period

- Showers and/or drizzle at times

Aside from a brief VFR interval this morning, primarily MVFR
CIGs are expected the rest of the period. Upstream obs of
patchy higher IFR CIGs suggest those may occur at times as well.
A few more waves of light showers and drizzle could temporarily
knock VSBY down to MVFR. Confidence is low on specifics with
additional rounds of -SHRADZ, and highlighted first potential
window with a PROB30 (late this morning through early to mid
afternoon). It appears RFD area has the best chance for showers
and/or drizzle to linger into tonight, though it can`t be ruled
out farther east as well.

Winds will shift from breezy southerly/south-southwest as of
this writing to southwesterly (220-240 deg) with a cold front
passage later this morning. Gusts will regularly be into the
20-25 kt range.

Castro

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory until 3 PM CST Thursday for the IL and IN
     nearshore waters.

&&

$$

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