Peotone Weather

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

Updated: Mon, 27-Oct-2025 2:31am CDT

- 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

Monday Sunny Tuesday Partly Sunny then Slight Chance Rain Showers Wednesday Chance Rain Thursday Chance Rain then Chance Rain Showers Friday Slight Chance Rain Showers Saturday Slight Chance Rain Showers Sunday Chance Rain Showers   Hi 59 °F Hi 59 °F Hi 55 °F Hi 53 °F Hi 53 °F Hi 51 °F Hi 54 °F   Overnight Mostly Clear Monday Night Partly Cloudy Tuesday Night Chance Rain Wednesday Night Chance Rain Thursday Night Slight Chance Rain Showers Friday Night Slight Chance Rain Showers then Partly Cloudy Saturday Night Partly Cloudy then Slight Chance Rain Showers   Lo 39 °F Lo 41 °F Lo 42 °F Lo 40 °F Lo 37 °F Lo 35 °F Lo 36 °F

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

173
FXUS63 KLOT 270537
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1237 AM CDT Mon Oct 27 2025

.KEY MESSAGES...

- A passing storm system may provide periods of rain across the
  area during the middle of the week, favoring areas south of
  Interstate 80.

- Expect seasonable temperatures through next weekend.

&&

.DISCUSSION...
Issued at 129 PM CDT Sun Oct 26 2025

A Rex block extending from southern Hudson Bay to the southern
Great Plains will slowly drift eastward through Monday. With
the main upper-level low remaining well south of the area,
mostly clear skies will prevail amid seasonable temperatures.

As the upper low (ridge) drifts eastward to the southeastern
states (western Quebec) by Tuesday, a mid-level low dislodging
from a broader trough over the northwest U.S. will unravel while
attempting to phase with the eastern low. Consensus guidance is
gradually coming into better agreement that the trough/low will
pivot from the Missouri River Valley on Tuesday to over central
Kentucky and Tennessee by Wednesday night. Remaining mid-level
moisture in the wake of the current low to the south will begin
to advect back northwestward ahead of the approaching wave
through the day Tuesday and especially on Wednesday. Upper-level
support from the entrance region of a northwestward directed
upper-level jet streak over Minnesota will support precip
generation west of the area by Tuesday morning.

Tuesday afternoon onward, the shield of rain should expand
northeastward and the northward toward our area. However, just
how far into our forecast area the rain expands remains unclear,
as extensive low-level drying from a psuedo-Hudson Bay high to
the northeast is a common trap scenario for under-performing
rain in our area. Blended NBM PoPs are bullish with likely
(>55%) values as far north as I-80 and mid-range chance (>40%)
values toward the Wisconsin state line by Tuesday night, with a
continuation of PoPs all the way into Thursday. While parts of
the area may ultimately see rain, there remain very realistic
scenarios where much of our area remains completely dry as the
system passes to our south. We`ll let future forecast shifts
tighten up the gradient in PoPs as we get closer.

Interactions with the current southern low, the incoming
western trough/low, and Hurricane Melissa should trend toward a
longwave trough across the Northeast U.S. late in the week.
Ensemble guidance then hints at a potential omega block
developing late next weekend into the subsequent week. Our area
would be situated on the western edge of the main longwave
trough to the east, yielding sporadic bouts of scattered rain
showers and perhaps some lake effect rain showers late week
through next weekend. Temps will remain seasonable during this
period as arctic air masses remains well north of the area.

Kluber/Borchardt

&&

.AVIATION /06Z TAFS THROUGH 12Z TUESDAY/...
Issued at 1235 AM CDT Mon Oct 27 2025

VFR conditions are forecast through the period.

Winds may remain slightly elevated overnight in Chicago around
8-12 kt out of the east, with lighter speeds at RFD/DPA. After
daybreak winds are expected to increase areawide up to around
13-15kt with gusts up to 20 kt in the afternoon. Gusts then
become less frequent after sunset inland from the Lake Michigan
shore, still out of the east.

Mostly clear skies are expected today with increasing high
cloud coverage occurring overnight into Tuesday morning ahead
of an approaching weather system.

Petr

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory until 7 PM CDT Tuesday for the IL
     nearshore waters.

&&

$$

Visit us at weather.gov/chicago

NWS LOT Office Area Forecast Discussion