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Mount Lebanon, Pennsylvania 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Lebanon PA
National Weather Service Forecast for: Mount Lebanon PA
Issued by: National Weather Service Pittsburgh, PA
Updated: 7:05 am EDT Aug 13, 2025
 
Today

Today: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm.  High near 83. Southwest wind around 7 mph.  Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Scattered
T-storms then
T-storms
Tonight

Tonight: Showers and thunderstorms likely before 2am, then a slight chance of showers.  Mostly cloudy, with a low around 69. Light west wind.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
T-storms
Likely

Thursday

Thursday: A chance of showers, with thunderstorms also possible after 11am.  Partly sunny, with a high near 86. Calm wind becoming north around 6 mph in the morning.  Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
Showers then
Chance
T-storms
Thursday
Night
Thursday Night: Mostly clear, with a low around 65. North wind 3 to 5 mph.
Mostly Clear

Friday

Friday: Sunny, with a high near 88. Light northeast wind.
Sunny

Friday
Night
Friday Night: Mostly clear, with a low around 67.
Mostly Clear

Saturday

Saturday: Sunny and hot, with a high near 90.
Hot

Saturday
Night
Saturday Night: Mostly clear, with a low around 69.
Mostly Clear

Sunday

Sunday: A chance of showers and thunderstorms after 2pm.  Mostly sunny and hot, with a high near 91. Chance of precipitation is 30%.
Sunny then
Chance
T-storms
Hi 83 °F Lo 69 °F Hi 86 °F Lo 65 °F Hi 88 °F Lo 67 °F Hi 90 °F Lo 69 °F Hi 91 °F

Hazardous Weather Outlook
 

Today
 
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm. High near 83. Southwest wind around 7 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
 
Showers and thunderstorms likely before 2am, then a slight chance of showers. Mostly cloudy, with a low around 69. Light west wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
 
A chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 86. Calm wind becoming north around 6 mph in the morning. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
Mostly clear, with a low around 65. North wind 3 to 5 mph.
Friday
 
Sunny, with a high near 88. Light northeast wind.
Friday Night
 
Mostly clear, with a low around 67.
Saturday
 
Sunny and hot, with a high near 90.
Saturday Night
 
Mostly clear, with a low around 69.
Sunday
 
A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 91. Chance of precipitation is 30%.
Sunday Night
 
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
Monday
 
Mostly sunny, with a high near 88.
Monday Night
 
Partly cloudy, with a low around 66.
Tuesday
 
A chance of showers. Mostly sunny, with a high near 86. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Mount Lebanon PA.

Weather Forecast Discussion
725
FXUS61 KPBZ 131136
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
736 AM EDT Wed Aug 13 2025

.SYNOPSIS...
Showers and thunderstorms are expected today and tonight as a cold
front crosses the region. The front will slowly exit on Thursday,
through a few showers or thunderstorms will still be possible south
of Interstate 80. Mainly dry weather is then expected Thursday night
through Saturday as high pressure builds in.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
KEY MESSAGES:

- Showers and thunderstorms today
- Locally heavy downpours possible
---------------------------------------------------------------

A lead shortwave trough will cross the region early this
morning, with the main upper support focused north of PIT.
Showers and thunderstorms will continue with this initial wave,
with elevated instability in place. Latest mesoanalysis shows
the Showalter index from -1 to -2 across eastern OH into Wrn PA.

After a brief break, another shortwave trough will approach and
cross the Upper Ohio Valley region this afternoon and evening.
Additional showers and thunderstorms are expected to develop
through the day as this shortwave crosses the region. The
associated surface cold front will also begin to drop sewd
across the region this afternoon, reaching the I-80 corridor by
evening. Current HREF MU CAPE values indicate 1500-2000 j/kg by
this afternoon with building diurnal instability. Expected 0-6km
shear is expected to be 20-25kt, with stronger flow north of
the area. With increasing moisture, models continue the trend of
a lack of dry air aloft as well. This should result in a
minimal potential for gusty wind.

PWATs are expected to increase to between 1.8 and 2.0 through
the day. Some localized downpours are possible, though with dry
antecedent conditions, expect minimal potential for isolated
flooding.

With cloud cover and precip, temperatures should generally
range from around 80 to the mid 80s for highs.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/...
KEY MESSAGES:

- A few lingering showers/storm Thursday south of I-80
- Generally dry Thursday night through Friday night
----------------------------------------------------------------

Expect shower and thunderstorm coverage to gradually decrease
this evening as the main shortwave exits, and diurnal
instability wanes. The surface front is progged to continue to
drift southward across the area overnight, maintaining some
chance for showers. Elevated instability is also expected to be
in place, and this could also result in a lingering
thunderstorm. Otherwise, some patchy fog and stratus should
develop with low level moisture in place.

A secondary weak shortwave is progged to cross the region on
Thursday, as the front advances slowly southward. This will
keep a chance of showers and thunderstorms for areas south of
I-80, with the highest probability south of PIT. Shower/storm
chances should quickly end by Thursday evening as the front
pushes further south, and surface high pressure begins to build
in.

Generally dry weather is then expected through Friday night as
surface high pressure builds in under WNW flow aloft.
Temperatures and humidity levels are expected to be lower than
recent days on Thursday. HIghs on Friday should return to the
mid 80s to near 90 for much of the area.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
KEY MESSAGES:

- Dry and hot for areas outside of the ridges Saturday
- Shower and thunderstorm chances return Sunday
- Mainly dry and hot Monday
- Showers and thunderstorm possible Tuesday
-------------------------------------------------------------------

Model ensembles indicate an upper high will set up across the
SE and central CONUS on Saturday. The Upper Ohio Valley region
is expected to be on the NE periphery of the high, with mainly
dry and hot conditions. The exception will be in the ridges,
where a few afternoon showers or thunderstorms are possible.

The high is then expected to retrograde westward Sunday through
the middle part of next week. This would result in NW flow
across the Upper Ohio Valley region. A shortwave embedded in
this flow, and an associated surface cold front, are expected
to cross the area on Sunday, with shower and thunderstorm
chances returning. High pressure should return dry weather to
the region on Monday. Models differ on the timing and strength
of another shortwave on Tuesday. The ensemble blend maintains
some chance POPs for showers/storms, and given the uncertainty,
this appears reasonable.

The hottest portion of the long term period is expected over
the weekend, when the maximum 500 mb heights over the region.
With a lowering of the heights under NW flow, temperatures are
expected to gradually lower through mid week.

&&

.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
The first wave of shower and thunderstorms activity has progressed
across much of the region but still lingers along our eastern and
northern peripheries bringing impacts to FKL/DUJ/LBE. This wave is
expected to continue its quick movement on east. A couple of showers
and storms are getting going in southern Ohio and could bring
impacts to HLG/MGW who have spent much of the morning away from main
impacts.

After this wave crosses it seems possible that portions of the later
morning into midday can be largely dry before another round of
showers and storms sparks off this afternoon and evening. Coverage
of these storms remains scattered but each storm can bring localized
reductions in CIGs/VIS and can bring gusty winds. The scattered
nature of these storms has been captured in a mixture of PROB30s
across the region later today. If confidence increases then these
can be pushed up to TEMPOs but at this time confidence in exact
locations remains far less than confidence in occurrence.

Stayed in line with keeping MVFR CIGs largely tied to convection.
Models have backed off some in the last 24 hours on just how much
moistening can occur in our environment. However, with a dry
atmosphere prior to this activity leaner drier seems the right move.
By the evening, as convection settles down with the loss of daytime
heating, CIGs should become widespread VFR with higher confidence.

Outlook... Thursday, a chance for showers and associated
restrictions return as the weak cold front slowly moves through our
region. A downward trend in rain potential and increasing confidence
in prevailing VFR is favored to end the week as high pressure
develops near New England.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...None.
OH...None.
WV...None.

&&

$$

SYNOPSIS...WM
NEAR TERM...WM
SHORT TERM...WM
LONG TERM...WM
AVIATION...Cermak/AK
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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