Lexington Weather

Lexington, Massachusetts, USA

64°F

7/26/2026 10:04pm

Lexington Conditions: Clear
Temperature: 63.9°F / 17.7°C
Dew Point: 52.3°F
Relative Humidity: 66%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.82 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 230549
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
149 AM EDT Thu Jul 23 2026

.WHAT HAS CHANGED...
No significant changes to the forecast.

&&

.KEY MESSAGES...

- Isolated showers and thunderstorms this afternoon. Drier
  conditions following today's cold front. 

- Mainly dry with seasonable temperatures through the weekend. 

- Rain and thunderstorm chances return for the first half of next
  week. Seasonable temperatures continue.

&&

.DISCUSSION...
KEY MESSAGE 1...Isolated showers and thunderstorms this afternoon. 
Drier conditions following today's cold front.

Satellite shows continued clearing over southern New England today, 
which has aided in the development of scattered showers and 
thunderstorms. As of the time of writing, the cold front is passing 
through western MA and CT based on latest observations towards the 
Berkshires and in north central CT. Ahead of the front, showers and 
thunderstorms have popped up across central MA, with an earlier 
round having gone through northern MA. These will continue to push 
eastward and will likely maintain their growth given the enhanced 
SBCAPE, MLCAPE, clearer skies, and warmer surface temperatures in 
the 80s with dew points climbing into the low 70s/upper 60s. Strong 
to damaging wind gusts remain a possibility given DCAPE values 
between 1000-1100 J/kg. These showers and thunderstorms should exit 
the region early tonight, generally around 8-9 PM. Some may linger a 
bit longer near the Cape and Islands, though.

As the cold front moves through the region today and tonight, winds 
will shift more NW, and drier air will move in with cooler 
temperatures. High pressure starts to build in from the west 
Thursday while an upper level trough moves over the northeast. Highs 
Thursday will reach the low to mid 80s given 925 mb temperatures 
around 16-18z. With high pressure building in, winds will slacken 
and seabreezes will likely develop tomorrow. Mostly clear skies and 
light to calm winds Thursday night will lend to radiational cooling 
as well, leading to lows dropping into the 50s.

KEY MESSAGE 2...Mainly dry with seasonable temperatures through the 
weekend. 

While the synoptic pattern will feature broad, weak troughing in the 
mid levels over the northeast, subsidence associated with a building 
surface high pressure center will keep things dry from Friday 
through at least Sunday. This, while said troughing pattern keeps 
seasonable temperatures around; 850 mb temps remain in the 11-13C 
range clear through early next week, which will lead to high 
temperatures in the upper 70s to low 80s each day. Behind today's 
cold front, dewpoints will drop into the 40s and low 50s through 
Sunday as well, making it feel less humid and more comfortable. 
Altogether this should be a fantastic stretch of weather for outdoor 
plans. 

KEY MESSAGE 3...Rain and thunderstorm chances return for the first 
half of next week. Seasonable temperatures continue. 

The pattern begins to break down around Monday with the mid level 
trough digging into the northeast with several disturbances rotating 
around the base of the trough inducing areas of surface low pressure 
which will stand the chance to bring us rain and thunderstorms as 
soon as Monday with the threat continuing much of next week. As 
mentioned previously, there is no big warm-up on the horizon.

&&

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

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

06Z Update... 

Through 12Z...High Confidence. 

VFR. Periods of IFR and patchy fog possible on the Cape and 
Islands through 10Z. Winds WNW/NW 5-10 kts. 

Thursday(Today)...High confidence.

VFR. Winds WNW to NW for most terminals 5-10 kts. Sea breezes 
for the coastal areas developing 18-20Z as NW winds weaken. If 
winds end up a touch stronger this afternoon, BOS may not sea 
breeze. Kept sea breeze in BOS TAF for now since it appears to 
be the more likely scenario at this time. Winds may become more 
variable later in the afternoon and evening for the interior 
terminals. Sea breezes shift toward S/SSE 21-00Z becoming S/SSW
after 00Z. 

Tonight...High confidence.

VFR. Light to calm winds overnight out of the SW. 

KBOS Terminal...Moderate confidence in TAF. 

Lower confidence due to some uncertainty in if the sea breeze 
will come in this afternoon. If winds end up staying around 10
kts, it may be just strong enough to keep the sea breeze
offshore. It still is more likely a sea breeze develops 18-20Z
out of the ESE, so kept in TAF for now. It may need to be re-
evaluated for the 12Z TAF.

KBDL Terminal...High confidence in TAF.

Outlook /Friday through Monday/...

Friday through Sunday Night: VFR. 

Monday: Mainly VFR, with local MVFR possible. Slight chance
SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Tonight through Thursday Night

Small Craft Advisories remain in effect for SW winds 10-20 kts
with gusts 25-30 kts and 6-10 foot seas for the outer coastal 
waters and southern waters. Highest waves are expected over the 
south coastal waters. Isolated showers and thunderstorms 
possible early tonight. 

A cold front crosses the waters tonight resulting in a wind 
shift to the NW. Winds and seas will slowly decrease overnight
across the northern waters. Seas will be the slower to decrease,
especially across the southern waters. High Surf Advisory
remains in effect for exposed southern coastlines through
Thursday given the elevated seas and the higher risk for rip
currents on Thursday given receding seas and residual swell.

Seas recede to 4 ft Thursday night with light winds over the
waters.

Outlook /Friday through Monday/...

Friday through Friday Night: Winds less than 25 kt. Seas
locally approaching 5 ft. 

Saturday through Saturday Night: Winds less than 25 kt. Areas
of seas approaching 5 ft. 

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

Sunday Night through Monday: Winds less than 25 kt. Slight
chance of rain showers. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Surf Advisory until 8 PM EDT this evening for MAZ020>024.
RI...High Surf Advisory until 8 PM EDT this evening for RIZ006>008.
MARINE...Small Craft Advisory until 2 AM EDT early this morning for 
     ANZ232>234-250.
     Small Craft Advisory until 2 PM EDT this afternoon for ANZ235-
     237.
     Small Craft Advisory until 8 PM EDT this evening for 
     ANZ254>256.

&&

$$

DISCUSSION...BW/Hrencecin
AVIATION...Mensch
MARINE...BW/Hrencecin