Lexington Weather

Lexington, Massachusetts, USA

63°F

6/10/2026 5:41am

Lexington Conditions: Clear
Temperature: 63.0°F / 17.2°C
Dew Point: 54.1°F
Relative Humidity: 73%
Wind: Calm, 10-min avg: Calm, gust: 1 mph
Barometer: 29.87 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 041920
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
320 PM EDT Thu Jun 4 2026

.WHAT HAS CHANGED...
Continue to refine summery temperatures and timing of 
precipitation along with the risk for thunderstorms (some could
be severe) for this coming weekend.

&&

.KEY MESSAGES...

- Quiet and dry through the rest of the work week into much of 
  Saturday with unseasonably warm temperatures.

- Unsettled weekend with late day to nighttime showers and
  thunderstorms (some could be strong), and another round of 
  scattered showers and sub-severe storms Sunday afternoon.

- Dry weather with cooler onshore flow through the early next
  week, but turning more summerlike by midweek.

&&

.DISCUSSION...
KEY MESSAGE 1...Quiet and dry through the rest of the work week into 
much of Saturday with unseasonably warm temperatures.

Not much has changed short-term from the previous forecast. 
Unseasonably warm temperatures continue as mid level ridging builds 
in over the northeast and surface high pressure remains affixed over 
much of the eastern US, centered over the SE US. 925 mb temperatures 
over southern New England continue to sit around 20C and climb 
slightly above it heading into Friday. By Saturday morning, they 
could reach 23C. Dewpoints Friday mostly remain in the upper 40s/low 
50s, increasing overnight heading into Saturday. Spots along the 
south coast could reach dewpoints in the upper 50s and even to 60F 
by Saturday morning, setting the stage for a more uncomfortable, 
humid heat compared to the days prior. Highs will climb into the low 
90s across southern New England tomorrow and Saturday, with slightly 
cooler temperatures in the upper 80s along the immediate coasts 
Friday; local seabreezes may provide this bit of relief.

Temperatures tonight could still get to the low 50s in the usual 
radiational cooling spots as winds go light. Some patchy fog could 
develop in those spots too, especially in SE MA. High clouds move in 
overnight continuing into Friday, but these should be high
enough to not have much effect overnight.

KEY MESSAGE 2...Unsettled weekend with late day to nighttime showers 
and thunderstorms (some could be strong), and another round of 
scattered showers and sub-severe storms Sunday afternoon.

A slow-moving cold front over interior northern New England 
associated with a positively-tilted 500 mb trough over the Gt Lakes 
will slowly trudge eastward into the warm airmass in place. This 
feature looks to bring an increasing risk for showers and 
thunderstorms Saturday. Given that the front's orientation runs 
nearly parallel to the 500 mb height contours, odds favor a slow-
moving frontal boundary. Currently the timing looks to be more 
centered late in the day Saturday and Saturday night, but ultimately 
the timing of the front will be critical on how strong any 
thunderstorms may become. Still, with mid-level lapse rates running 
around 6.5 to 7 C/km, a risk for thunderstorms could linger well 
into the night. A few storms could become strong with brief heavy 
downpours and localized straight line wind damage being the main 
risks, with the best chance being in interior Southern New England, 
but some risk for sub-severe storms could linger into the evening. 
This cool front then moves towards and offshore the South Coast 
toward the pre-dawn hours. 

For Sunday...we'll probably have residual subsidence and mostly 
cloudy, somewhat humid and generally dry weather to begin the day 
into at least a part of the morning hours. Another round of showers 
and embedded thunderstorms then develops along a secondary, backdoor 
frontal boundary moving southward from VT/NH, starting around early 
to midafternoon and tending to be a little more concentrated in 
central and eastern portions of Southern New England. With weak 
winds aloft, the risk for severe weather with this second round of 
showers and storms looks low. Temps on Sunday look quite a bit 
cooler in the 70s to lower 80s, but it will still feel a little 
humid but not oppressively so. Once the secondary/backdoor front 
moves offshore, this will bring about a cool onshore NE flow with 
lots of low clouds and cooler temps (lows in the lower 50s). 

We do really need the rain, but that's offset by the idea that there 
are several outdoor events happening this weekend. There is still 
some uncertainty in the timing, but as it stands right now: it looks 
as though much of the daytime hours Saturday end up being warm and 
somewhat humid but generally dry, but the risk for showers and 
storms increases late in the day and into the nighttime hours. The 
better potential for storms becoming strong in this timeframe. 
Additional showers and storms develop starting early Sunday 
afternoon, and while the risk for severe weather is even lower with 
this round, there could be a pretty generous coverage of storms 
around.  

KEY MESSAGE 3...Dry weather with cooler onshore flow through the 
early next week, but turning more summerlike by midweek.

Amplified weather pattern develops with a large mid/upper level 
ridge extending from the Gulf Coast northward all the way to the 
southern shores of Hudson Bay in Canada. 850 mb temps in the mid to 
upper teens Celsius are associated with this amplified ridge. At 
least for the first few days early next week, we'll be shielded from 
these very warm temps as onshore flow prevails with mostly sunny 
conditions. Although the timing is unclear, eventually the amplified 
ridge and warmer air aloft comes in around midweek, and with that 
comes a return to summerlike temps in the 80s to low 90s.

&&

.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...

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

18z TAF Update...
Modified to include Friday night.

Through Friday Night...High confidence.

VFR conditions continue through Friday. Seabreezes this
afternoon should kick back out within the next few hours. 
Otherwise, SW winds sustained just over 10 kt through the rest 
of this afternoon and 20-25 kt gusts towards the south coast and
Cape. Similar story for Friday as seabreezes move in early 
afternoon/late morning and kick back out towards sunset in the 
midst of persistent SW winds in SE MA and coastal areas. W winds
expected Friday across much of the region.

For tonight, winds drop off below 5 kt for most. Some patchy fog
cannot be ruled out, particularly in SE MA. Similar conditions
expected Friday night with calm winds, though very dry so not
much in the way of fog is expected to develop.

KBOS...High confidence in TAF.

KBDL...High confidence in TAF.

Outlook /Saturday through Tuesday/...

Saturday: VFR. Breezy. Chance SHRA.

Saturday Night: VFR. Breezy. SHRA likely, slight chance TSRA.

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

Sunday Night: Mainly VFR, with local IFR possible. Breezy.
Chance SHRA.

Monday: VFR. Breezy. 

Monday Night: VFR. 

Tuesday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Friday Night...High confidence.

Marginal SCA winds remain possible over Buzzard's Bay, Vineyard
Sound, and Nantucket Sound through the rest of this afternoon. 
Otherwise, seas remain between 2-4 ft through Friday night. 
Winds Friday will likely be similar to today's setup, but winds 
over Buzzard's Bay and the aforementioned areas from today's
elevated winds should remain just below Small Craft Advisory
criteria. If criteria winds do develop among the SW winds 
tomorrow, it should be marginal. Across the rest of the waters,
winds up to 20 kt are possible through this evening, then all
should remain at or below 15 kt tomorrow and tomorrow night.

Outlook /Saturday through Tuesday/...

Saturday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Seas up to 5 ft. 

Saturday 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. 

Sunday: Winds less than 25 kt. Seas up to 5 ft. Slight chance
of rain showers, slight chance of thunderstorms. 

Sunday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers. 

Monday: Moderate risk for Small Craft Advisory winds with gusts
up to 25 kt. Areas of rough seas. Slight chance of rain
showers. 

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

Tuesday: Winds less than 25 kt.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 9 PM EDT this evening for 
     ANZ232>234.

&&

$$

DISCUSSION...Loconto/Hrencecin
AVIATION...Loconto/Hrencecin
MARINE...Loconto/Hrencecin