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Lombard, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Lombard IL
National Weather Service Forecast for: Lombard IL
Issued by: National Weather Service Chicago, IL
Updated: 2:41 am CDT Jun 29, 2025
 
Overnight

Overnight: Mostly clear, with a low around 72. Calm wind.
Mostly Clear

Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 94. Heat index values as high as 100. South southwest wind 5 to 10 mph.
Sunny then
Slight Chance
T-storms
Sunday
Night
Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am.  Mostly cloudy, with a low around 73. South wind 5 to 10 mph.
Chance
T-storms

Monday

Monday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm.  Mostly cloudy, with a high near 85. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 15 mph.  Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
Monday
Night
Monday Night: Mostly clear, with a low around 66. West northwest wind 5 to 10 mph.
Mostly Clear

Tuesday

Tuesday: Sunny, with a high near 85.
Sunny

Tuesday
Night
Tuesday Night: Mostly clear, with a low around 66.
Mostly Clear

Wednesday

Wednesday: Sunny, with a high near 88.
Sunny

Wednesday
Night
Wednesday Night: Mostly clear, with a low around 68.
Mostly Clear

Lo 72 °F Hi 94 °F Lo 73 °F Hi 85 °F Lo 66 °F Hi 85 °F Lo 66 °F Hi 88 °F Lo 68 °F

 

Overnight
 
Mostly clear, with a low around 72. Calm wind.
Sunday
 
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Heat index values as high as 100. South southwest wind 5 to 10 mph.
Sunday Night
 
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 73. South wind 5 to 10 mph.
Monday
 
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 85. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 60%.
Monday Night
 
Mostly clear, with a low around 66. West northwest wind 5 to 10 mph.
Tuesday
 
Sunny, with a high near 85.
Tuesday Night
 
Mostly clear, with a low around 66.
Wednesday
 
Sunny, with a high near 88.
Wednesday Night
 
Mostly clear, with a low around 68.
Thursday
 
Mostly sunny, with a high near 88.
Thursday Night
 
Partly cloudy, with a low around 69.
Independence Day
 
Mostly sunny, with a high near 91.
Friday Night
 
Partly cloudy, with a low around 74.
Saturday
 
A chance of showers and thunderstorms. Mostly sunny, with a high near 92.

 

Forecast from NOAA-NWS for Lombard IL.

Weather Forecast Discussion
862
FXUS63 KLOT 290831
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
331 AM CDT Sun Jun 29 2025

.KEY MESSAGES...

- Hot and humid today with peak heat indices around 100 degrees
  away from the Illinois shore (modest lake cooling there).

- Isolated gusty thunderstorms are possible this afternoon
  through tonight, with the lake breeze being a likely focus if
  storms develop this afternoon.

- Scattered thunderstorms are probable on Monday ahead of a cold
  front, with the strongest capable of producing localized
  damaging winds.

- Heat and humidity will return for the 4th of July holiday
  weekend, along with thunderstorm chances, particularly on
  Saturday-Sunday.

&&

.DISCUSSION...
Issued at 331 AM CDT Sun Jun 29 2025

Through This Evening:

The main story today will be the hot and humid conditions,
though isolated thunderstorms are still possible.

Early this morning, the anticipated MCS across the upper MS
Valley and northern WI is pushing eastward across NW WI. The
lack of appreciable southeastward propagation of outflow thus
far suggests that this feature will likely be a non-factor in
our weather this afternoon. Regional observations depict a pool
of low-mid 70s dew points from downstate and central IL into
eastern Iowa. These oppressive dew points will slosh back
northward into our area today, setting the stage for another day
of heat and humidity (after the brief break in the humidity on
Saturday).

The main question mark regarding the peak heat indices today is
afternoon dew point (Td) trends. Given recent overly aggressive
mixing out of dew points on humid days, continued to lean
toward the less "mixy" guidance. Thus, kept forecast Td
generally in the 70s, with the best chance for upper 60s across
interior portions of Chicago and nearby. Climo of expected 925
mb temps (mid 20s Celsius) at peak heating today yields highs in
the lower-mid 90s. Barring convective and/or lake breeze
influence reaching interior Chicago and nearby suburbs, the
localized mid 90s readings should be most prevalent in these
areas. Peak heat indices should top out in the upper 90s to
around 100, similar to our previous official forecasts.

Modest south-southwest synoptic winds and the sharp land-lake
thermal gradient should be conducive for a lake breeze to slip
inland along the Illinois shore and the boundary likely held up
just off the Indiana shore. For interests near the lake in
Chicago today, temps should quickly near 90F by the late
morning, but then the lake breeze will likely knock readings
back into the 80s thereafter. Dew points staying in the 70s will
keep it very warm and humid, however, with heat indices likely
still in the lower to mid 90s within range of the lake cooling.

Turning to convective potential today, any large scale forcing
mechanisms are quite nebulous aside from weak 700 mb impulses
amidst otherwise non-existent mid-upper flow (very weak wind
shear). On the other hand, forecast soundings on the less mixed
out guidance suggest we`ll be uncapped and moderately to
strongly unstable shortly after noon. The main persistent zone
of convergence being the lake breeze makes the near lake zone
one to watch for a few storms to pop, as soon as by 1pm or so.
CAM guidance has been alternating in terms of convecting or not
convecting on the lake breeze, likely tied to the importance of
exact dew point trends. If storms develop right on the lake
breeze, eastward motion of only 10-15 mph may force the lake
breeze farther inland and conceivably expand the inland extent
of isolated storms in NE IL and far NW IN.

Farther inland, a weak impulse across central IL may be another
subtle zone of interest for isolated convection to bubble
northward, potentially aided by slow outflow propagation. Also
can`t completely rule out isolated "airmass" convection
elsewhere. All in all, most spots have only slight chance (~20%)
PoPs, indicating primarily dry conditions. Maintained a ring of
low chance (~30%) PoPs near the lake. Satellite trends will
need to be monitored closely. While deep layer shear will be
sub-marginal today, forecast soundings look supportive of
localized strong downburst winds in any storms that do develop,
with upwards of 1000 J/kg of DCAPE progged.

Tonight through Monday Evening:

Following diurnal decay of any lingering isolated thunderstorms
around sunset, we`ll have to keep an eye on loosely organized
multicells upstream moving in, albeit likely on a weakening
trend given the overnight timing and weak shear environment.
Kept PoPs in the slight to low chance (~20-30%) range, highest
far northwest, given the uncertainty and plausible scenario for
much of the night to be quiet and muggy.

If thunderstorm coverage remains minimal tonight into or through
Monday morning, the setup looks favorable for higher/scattered
thunderstorm coverage Monday afternoon. A digging mid-upper
trough in tandem with an approaching cold front will provide
stronger forcing for ascent. Cloud cover, marginal mid-level
lapse rates, and the stronger flow aloft not arriving until late
afternoon  appear to be some of the key limiting factors
regarding organized convection. With that said, deep layer bulk
shear up near 30 kt by the afternoon could yield multicell
clusters with high PWATs conducive for wet downbursts (and
localized instances of flooding). Capped PoPs at the high chance
to likely range (50-70%) for Monday since convective coverage
may still only end up scattered in nature.

Monday will be another seasonably warm and very humid day, with
dew points in the 70s. A three-day break in the humidity looks
to follow with drier northwest flow, so highs in the mid-upper
80s away from any lake cooling will be more tolerable. The
nighttime periods should be pleasant as well. Turning ahead to
the 4th of July holiday weekend, medium range guidance remains
in good agreement in the heat and humidity returning (highs near
to a bit above 90F with dew points back in the 70s). Convective
chances may end up somewhat minimal (better focus north) on the
day and evening of the 4th, with signs then pointing toward a
potentially more stormy Saturday-Sunday period (chance PoPs for
now).

Castro

&&

.AVIATION /06Z TAFS THROUGH 12Z MONDAY/...
Issued at 1214 AM CDT Sun Jun 29 2025

The key aviation weather messages are:

- Isolated thunderstorm development possible along a lake breeze
  this afternoon. Coverage/chances currently too low for VCTS
  mention near Chicago terminals attm.

- Additional low chances for showers/storms Sunday night-early
  Monday AM, but confidence once again too low to justify TS
  mentions.

Variable to light SE winds will prevail tonight with VFR
conditions. Winds will gradually become SW through Sunday
morning around 5-10 kt.

Airmass will become hot/humid and unstable during the late-
morning and afternoon. A sharpening lake breeze may serve as a
focus for isolated thunderstorm development, but confidence in
TS remains under 50% threshold for VCTS mention at this point.
Have continued with "dry" TAFs at the Chicago-area sites, but
consideration for TS mention may be necessary in future
issuances. If storms develop on the lake breeze, east/northeast
wind shifts would be in play in the afternoon.

Additional isolated-scattered showers and storms may develop
Monday evening and overnight. Signal for TS during this period
again appears to nebulous to justify a thunder mention however,
with chances currently around 20-30 percent.

Carlaw

&&

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

&&

$$

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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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