Lexington Weather

Lexington, Massachusetts, USA

62°F

7/26/2026 10:53pm

Lexington Conditions: Clear
Temperature: 62.1°F / 16.7°C
Dew Point: 51.4°F
Relative Humidity: 68%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.81 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 260558
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
158 AM EDT Sun Jul 26 2026

.WHAT HAS CHANGED...
A Rip Current Statement has been issued for Cape Cod from 8 
this evening through 7 am Monday.

&&

.KEY MESSAGES...

- Fair weather for most areas except the Cape and Islands 
  Sunday and Monday. A Rip Current Statement has been issued for
  Cape Cod tonight through early Monday.

- Temperatures on the lower end of seasonable as periodic 
  chances for showers and thunderstorms return Mon-Wed (possibly
  into Thurs). Monitoring for increasing chances of localized 
  heavy rainfall and potentially flash flooding.

&&

.DISCUSSION...
KEY MESSAGE 1...Fair weather for most areas except the Cape and
Islands Sunday and Monday. A Rip Current Statement has been 
issued for Cape Cod tonight into Sunday.

Another mostly clear day Sunday as weak high pressure maintains
control. Height falls ahead of an approaching trough and a low 
pressure system passing well offshore brings moisture and clouds
to the Cape and Islands Sunday afternoon. Model soundings 
indicate a shallow layer of moisture at the surface with dry air
above. It is more likely that this layer will be too shallow to
support any showers/drizzle. A worst case would be some patchy 
drizzle for the outer Cape/Islands. Aside from the clouds in 
some areas, it will be a mainly dry day with a northeasterly 
breeze for the eastern coastal areas. Temperatures likely range 
in the low to mid 80s for the interior and mid to upper 70s in 
the eastern and coastal areas. 

A Rip Current Statement has been issued for the Cape as 
easterly winds and prolonged swells leads to a moderate to high 
chance for rip currents. While the highest risk exists along the
Cape, an elevated chance of rip currents spans the south and 
east coastline with the greatest risk for the east-facing 
beaches along the Cape and Islands and portions of the east 
coast of MA.

Slightly warmer conditions across the interior on Monday with 
925 mb temps warming to +20-23C translating to max temps in the 
mid and upper 80s. A deeper shortwave trough moves overhead, and
with associated mid-level cooling should introduce increasing 
cloud cover by the afternoon. Guidance shows a 20-40% chance of 
showers across western portions of the CWA as forcing and 
instability build.

KEY MESSAGE 2...Temperatures on the lower end of seasonable as 
periodic chances for showers and thunderstorms return Mon-Wed 
(possibly into Thurs). Monitoring for increasing chances of 
localized heavy rainfall and potentially flash flooding.

Ensemble guidance has started to come into better consensus 
that a low pressure system will traverse through the Great Lakes
Monday/Tuesday and into New England around Wednesday. This 
system will likely be accompanied by several embedded shortwaves
and a mid- level trough, bringing chances for a few rounds of 
showers, and possibly thunderstorms, Monday through Wednesday...
possibly lingering into Thursday. There continues to be a 
strong signal for PWATs 120-170 percent of normal to advect into
the region by Tuesday, with deterministic guidance on the 
extreme high end of that range. Some guidance is also honing in 
on some potential for the low to slow on approach to New England
as well as slower mid-level wind speeds, which would create an 
environment for training storms. Combined with the enhanced 
forcing of the low, the higher PWATs and potential for training,
localized heavy rainfall and potentially flash flooding are 
becoming something to watch for. Unfortunately, there still 
remains a large amount of uncertainty in the guidance regarding 
where exactly the low could track, with some models indicating 
the low moving further south near NYC and some further north 
through northern MA. Depending on where exactly the low tracks, 
it's possible the threat ends up west/south of the region or 
confined to western portions of southern New England.

Otherwise, high temperatures are expected to remain on the 
lower end of seasonable, even dipping to slightly below normal 
at times given 850mb temperatures hovering around +12C to +14C 
through mid-week.

&&

.AVIATION /06Z SUNDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent.

06z TAF Update...

Through 12Z...Moderate confidence.

VFR for most. Very low chance of some marginal MVFR conditions 
across Cape and Island terminals after 08Z with the higher risk
for ACK. Light northerly to variable winds.  

Sunday...High confidence overall (Moderate for cigs in east).

VFR for most. A stream of moisture brushes across the Cape and
Nantucket today resulting increased cloud cover. The potential
for MVFR ceilings is still lower confidence, though the higher
risk would be for ACK with periods of MVFR/IFR cigs possible.
Also can't rule out a deck of lower clouds near the BOS terminal
around 12Z, but this is very low probability at this time. 

E winds for the interior 5-10 kts. NE winds for east coast 
terminals 8-12 kts few gusts to 20 kts possible for 
Cape/Islands.

Tonight...High confidence overall (Moderate for cigs for
Cape/Islands).

If ceilings ended up lowering today for the Cape/Islands, expect
MVFR/IFR cigs to continue overnight for those areas. Greatest
risk for IFR cigs at ACK with patchy FG possible. VFR elsewhere.
Light northerly to VRB winds. 

KBOS Terminal...Moderate Confidence in TAF. 

Only moderate confidence due to the low end potential for a
patch of lower MVFR cigs to develop offshore of the BOS 
terminal 11-14Z this morning. This is very low probability as it
is not showing up on satellite yet. Will have to keep an eye out
for development this morning.

KBDL Terminal...High confidence in TAF.

Outlook /Monday through Thursday/...

Monday: VFR. 

Monday Night: VFR. Slight chance SHRA.

Tuesday: Mainly VFR, with local MVFR possible. Breezy. Chance
SHRA, chance TSRA.

Tuesday Night: Mainly MVFR, with local IFR possible. Breezy.
SHRA likely, chance TSRA.

Wednesday: Mainly VFR, with areas MVFR possible. Breezy. SHRA
likely, chance TSRA.

Wednesday Night through Thursday: VFR. Breezy. Chance SHRA,
slight chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent.

Through Tuesday...High confidence.

Light winds and seas 1-4 ft through Monday. Increasing winds 
and seas for Sunday; however, below SCA. NE winds 8-12 kts with 
gusts to 20 kts and seas 2-4 ft with 5 ft for the outermost 
southern waters. Seas increase to 4-6 ft later Tuesday afternoon
with SCA conditions becoming More likely. 

Increased risk for rip currents Sunday with the greatest risk 
for the east-facing beaches/coastline.

Outlook /Monday

Monday: Winds less than 25 kt. Seas locally approaching 5 ft. 

Monday Night: Winds less than 25 kt. 

Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Chance of rain showers. 

Tuesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers,
slight chance of thunderstorms. 

Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Seas up to 5 ft. Rain showers likely, slight
chance of thunderstorms. 

Wednesday Night: Winds less than 25 kt. Seas up to 5 ft. Chance
of rain showers. 

Thursday: Winds less than 25 kt. Rough seas up to 9 ft. Slight
chance of rain showers. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents through Monday morning for MAZ022.
RI...None.
MARINE...None.

&&

$$

DISCUSSION...McMinn/FT
AVIATION...Mensch
MARINE...McMinn/FT