Portland, Maine 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

617
FXUS61 KGYX 252312
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
712 PM EDT Sat Apr 25 2026

.WHAT HAS CHANGED...
No significant forecast changes made this evening as the
weather remains quiet.

&&

.KEY MESSAGES...
1. Dry weather continues through the weekend with warming
temperatures.

2. Unsettled weather makes a return toward the middle of next
week after a dry start.

&&

.DISCUSSION...
KEY MESSAGE 1 DESCRIPTION...

No significant weather concerns through the weekend as high
pressure builds behind a departing upper low. Even with dry
conditions, light winds should keep the risk of elevated fire
weather conditions low. Low pressure moves through the Mid-
Atlantic today as a trough digs in as well. This will allow for
development of a large area of precipitation, but height rises
over our area will keep it suppressed just to the southwest. I
suppose I can`t completely rule out a sprinkle along the
Massachusetts state line in southwestern New Hampshire
overnight, but that is all it would be. Skies tonight should
remain mostly clear with any cloud cover from the aforementioned
system being high over our area. Because of this I have blended
in some MOS guidance to account for a degree of radiational
cooling that would lead to lower temperatures, especially across
the north where skies should be clearest. Expect low to mid-30s
south of the mountains, and mid- to upper 20 to the north.
Temperatures are on a gradual warming trend, but still around
normal thanks to northerly flow aloft and afternoon seabreezes.
Temperatures should be able to climb into the low to mid-60s
across much of the area, with the seabreeze likely keeping the
immediate coast in the 50s. Sunday night should be a little bit
warmer than Sunday, but will almost certainly feature less
clouds as heights continue to rise and low pressure tracks
eastward south of our area. Blending in some MOS here for
radiational cooling, results in temperatures in the 30s
areawide.

KEY MESSAGE 2 DESCRIPTION...

The week will start on a dry note as an H5 ridge axis remains
overhead, keeping low pressure well to our southeast. Skies will
be partly cloudy with high temperatures ranging from the lower
50s along the coast due to onshore flow with lower to middle 60s
inland. Radiational cooling is then likely Monday night as
skies clear and winds weaken. Low temperatures at or below
freezing are likely in most locations. Tuesday will remain dry
with partly cloudy skies and similar high and low temperatures
to those of Monday.

The ridge will begin to break down on Wednesday with a few
showers possible, especially during the afternoon with cooler
high temperatures into the lower to middle 50s. A cooler and
more unsettled pattern then looks likely Wednesday night through
the remainder of the week as cutoff low pressure meanders near
or just east of New England, potentially allowing for beneficial
rainfall given the ongoing drought conditions. Significant
uncertainty exists at this time range regarding specific
rainfall amounts but by the end of the week, moderate rainfall
is possible in at least parts of the region. Temperatures will
also trend towards below average.

&&

.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
Through 18Z Sunday...Generally VFR conditions are expected into
Sunday afternoon as high pressure builds overhead. Coastal
terminals will see a wind shift Sunday afternoon with the
seabreeze.

Outlook:

Rest of Sunday/Sunday night: Generally VFR conditions persist
through Sunday night.

Monday/Monday Night: VFR expected. E-NE winds at 10-15 kts.

Tuesday/Tuesday Night: VFR expected. E-SE winds at 10-20 kts.

Wednesday/Wednesday Night: Lowering ceilings with restrictions
likely with developing RA.

Thursday/Thursday Night: Restrictions likely to continue along
with periods of RA.

&&

.MARINE...
Sub-sca conditions are expected through Sunday night as high
pressure builds over the waters. Winds shift from southwesterly
to northerly overnight tonight, before switching back to
easterly with the seabreeze tomorrow afternoon

SCA conditions possible Tuesday night through at least Thursday
due to building seas outside of the bays as low pressure crosses
over the Gulf of ME.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...None.

&&

$$

DISCUSSION...Baron/Ekster/Tubbs
AVIATION...Baron/Tubbs
MARINE...Baron/Tubbs