Overnight:
Clear, with a low around 59. West wind around 5 mph.
Friday:
Sunny, with a high near 86. Northwest wind 5 to 10 mph.
Friday Night:
Mostly clear, with a low around 55. North wind 5 to 10 mph.
Saturday:
Sunny, with a high near 78. Northeast wind 5 to 10 mph.
Saturday Night:
Partly cloudy, with a low around 57. East wind around 5 mph.
Sunday:
Partly sunny, with a high near 76.
Sunday Night:
Partly cloudy, with a low around 57.
Monday:
Partly sunny, with a high near 80.
AREA FORECAST DISCUSSION
National Weather Service Mount Holly NJ
238 AM EDT Fri Sep 19 2025
Weather Synopsis:
A weak area of high pressure will remain across the Middle
Atlantic region for much of today with a cold front pushing
through the region tonight. A strong high pressure system will
build southeast over the weekend before weakening and shifting
slowly eastward through the first half of next week, with
moderating temperatures and a few chances for rain.
Near Term:
THROUGH TONIGHT -
Latest surface analysis places weak high pressure over our
region, centered on the central Appalachians. A cold front is
pushing southward across the St. Lawrence River Valley along
the US/Canadian border, with a stronger high pressure following
behind it in southern Canada. Aloft, a broad trough is
positioned across much of eastern Canada into the northeastern
United States, with a weak ridge to our west across the western
Great Lakes and Ohio Valley.
Through tonight, the ridge aloft will actually build eastward
toward our region even as the surface cold front presses
southward into our area. Thus, there is very little risk for any
precipitation or even a whole lot of clouds with this surface
front which is pretty lacking for any upper-level support.
Therefore, with northwesterly winds prevailing, expect a mostly
sunny and warm day, though humidity will diminish a bit. Highs
generally in the 80s after any patchy early morning fog
dissipates (though that looks very patchy at this time).
Tonight, northerly winds continue as the surface front settles
south and the high to the north builds in somewhat, while the
ridge aloft also builds in. Thus, a dry night is on tap. Lows
40s in the Poconos and NW NJ, 50s I-95 corridor away from the
urban core, and 60s Delmarva, urban core and immediate NJ
shore.
Short Term:
SATURDAY THROUGH SUNDAY NIGHT -
A high pressure system will be our main surface feature for the
short term period. The high will be in control across the northeast
on Saturday with dry conditions and a mostly to partly sunny sky.
Due to the onshore flow from the high pressure system being to our
north, there is the potential for more cloud cover near the coastal
areas with even a light shower possible. Overall, not expecting much
in the form of precip Saturday as the high pressure system also has
a pretty dry airmass with it. Highs on Saturday will be in the 70s.
On Saturday night, lows are in the low 50s to low 60s with clouds
increasing. We stay dry overnight.
It is a similar setup on Sunday with the high pressure system
starting to sink southeast a bit. We continue to have onshore flow
which may lead to the potential for a slight chance of showers for
parts of Delmarva and coastal areas. Otherwise, it is a mostly to
partly sunny day with highs mainly in the 70s.
Long Term:
MONDAY THROUGH THURSDAY -
Our surface high pressure system remains in control on Monday but it
is starting to shift more to the east. Due to the placement of the
high as it moves east, we start to get more of southerly wind
direction which will allow moisture to increase. We are mostly
to partly sunny on Monday with high temperatures in the 70s.
A warm front approaches from the west Monday night into Tuesday.
Clouds increase west to east on Monday night and continue to build
into Tuesday. As this warm front moves through, we start to see the
potential for showers increase from west to east. The best potential
for any showers or even an isolated thunderstorm is during the day
Tuesday. Most of the shower coverage on Tuesday will be isolated to
widely scattered with PoPs 30-50% currently. High temperatures on
Tuesday will be in the mid 70s to mid 80s.
On Wednesday, a cold front will be sinking southeast early in the
day with the potential for some isolated to widely scattered showers
lingering through the day Wednesday as that cold front passes
through. Some model guidance wants to develop a low along this front
which would enhance precip coverage and organization. There is
uncertainty regarding this scenario and how developed the low
would become. For now, PoPs Tuesday night and Wednesday are
capped at 20-30% with the cold front passing through. Highs on
Wednesday are mainly in the 70s.
Some showers may stick around for Thursday but a high pressure
system will also be building in from the north. Latest model
guidance trends have shown the high pressure system being
stronger which keeps the area on the drier side. Right now, PoPs
are capped at slight chance given the uncertainty at this point
in the forecast period. We stay partly to mostly cloudy on
Thursday with highs in the low to mid 70s.
Click for full NWS PHI Office Area Forecast Discussion
