Lexington Weather

Lexington, Massachusetts, USA

76°F

8/26/2026 7:20pm

Lexington Conditions: Overcast
Temperature: 75.9°F / 24.4°C
Dew Point: 64.6°F
Relative Humidity: 68%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.96 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 241720
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
120 PM EDT Mon Aug 24 2026

.WHAT HAS CHANGED...
High Risk of rip currents through this evening for the south-facing 
beaches of Marth'a Vineyard and Nantucket. A marginal Small Craft 
Advisory issued for Buzzards Bay and Vineyard Sound for Tuesday 
afternoon. 

&&

.KEY MESSAGES...

- Mainly dry and seasonable conditions, outside of a stray
  shower this afternoon and Tuesday afternoon.

- Main risk for a round of scattered showers and a few
  thunderstorms will be sometime late Thu/Thu night into Fri
  with summerlike humidity. Mainly dry & seasonable weather
  favored for the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...Mainly dry and seasonable conditions, outside of a 
stray shower this afternoon and Tuesday afternoon.

The synoptic setup for the next several days is as follows. A mid-
level low, which is easily seen on GOES water vapor imagery across 
northern New York, will move into northern New England before 
drifting east into the Canadian Maritimes by Wednesday. Locally, 
Wednesday brings a subtle shortwave ridge. In general, expect benign 
conditions through the first half of Thursday as surface high 
pressure expands into the Northeast from the Midwest. However, a 
stray pop-up shower or thunderstorm remains possible this afternoon 
and Tuesday afternoon due to cyclonic flow, which will promote 
diurnal cu development amid steep low-level lapse rates (greater 
than 8C/km) along a trough. No severe weather is expected, as mid-
level lapse rates remain poor (less than 6C/km). Areas with the best 
chance of experiencing a brief shower or storm (less than a 25 PoP) 
through this afternoon are west of KIJD, KORH, and KFIT, associated 
with the passage of a weak surface trough. Thereafter, cannot 
discredit a shower farther east along the Boston-to-Providence 
corridor. Similar conditions are expected again Tuesday. Wednesday 
into Thursday, the mid-level shortwave ridge moves through, 
providing another dry day Wednesday. However, the ridge shifts east 
by Thursday ahead of an approaching trough, which has the potential 
to bring numerous showers late Thursday into Friday. More on that in 
Key Message 2.

As for temperatures, expect a seasonable week, with afternoon highs 
in the lower 80s and higher-terrain communities in the northern 
Worcester Hills and eastern Berkshires remaining in the middle to 
upper 70s. Nightly lows will be a touch cooler as clear skies and 
light winds allow for radiational cooling, with temperatures 
slipping back into the 50s while urban areas remain near 60 degrees. 
This setup may allow for another night of low stratus or fog. 
Confidence in how widespread it becomes remains low; however, it 
does not appear this round of fog will be as prevalent as last
night.


KEY MESSAGE 2...Main risk for a round of scattered showers and a few 
thunderstorms will be sometime late Thu/Thu night into Fri with 
summerlike humidity. Mainly dry & seasonable weather favored for the 
weekend.

The next shortwave trough approaches from the west by late in the 
work week. Ahead of this approaching shortwave...summerlike humidity 
will return Thu into Fri. Timing quite uncertain this far out in the 
forecast...But appears there will be the potential for a round of 
scattered showers and a few thunderstorms sometime in the late 
Thu/Thu night into Fri time frame. CSU machine learning probs do 
indicate some low probs for severe weather/heavy rainfall 
potential...But that is really just climo for an approaching 
shortwave this time of year. So not much more we can say at this 
point. Current guidance does indicate that drier/seasonable weather 
is favored to return for the upcoming weekend.

&&

.AVIATION /18Z MONDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...

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

18z TAF Update:

Through 12z...Moderate to high confidence.

VFR. SW to WSW wind gusts of 20 to 25 kt through 23-00z, diminishing 
thereafter. A stray shower or thunderstorm remains possible this 
afternoon, primarily west of KIJD, KORH, and KFIT through 00z. 
Thereafter, cannot discredit a shower farther east toward the KBOS 
to KPVD corridor. Overnight, light to calm winds and clear skies may 
allow for areas of fog. Confidence in how widespread fog becomes 
remains low, though it does not appear this round will be as 
prevalent as last night.

Tuesday...High confidence in trends, lower confidence in shower 
coverage.

VFR. WSW to W winds 8 to 12 kt, with gusts up to 18 kt. A stray 
shower or thunderstorm is possible during the afternoon, though 
confidence in areal coverage remains low.

Tuesday Night...

VFR and dry. W to WNW winds less than 5 kt.

KBOS Terminal...High confidence.

Wind gusts through 23-00z, then SSW to SW winds overnight at 5 to 8 
kt. Winds shift to WSW to W Tuesday, with speeds of 10 to 12 kt and 
gusts up to 18 kt.

KBDL Terminal...High confidence.

Outlook /Wednesday through Saturday/...

Wednesday through Wednesday Night: VFR. 

Thursday: VFR. Breezy. Chance SHRA, chance TSRA.

Thursday Night: Mainly VFR, with local MVFR possible. Chance
SHRA, slight chance TSRA.

Friday: VFR. Chance SHRA, slight chance TSRA.

Friday Night through Saturday: VFR. 

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Tuesday Night...High confidence.

Fairly quiet boating conditions through the first half of this week 
as high pressure develops across the Midwest before expanding toward 
the waters off the coast of southern New England. Gusty southwest 
flow develops Tuesday, with gusts around 20 kt. However, Vineyard 
Sound and Buzzards Bay are oriented roughly parallel to the wind, 
allowing for a localized enhancement from funneling. Have opted to 
issue a marginal Small Craft Advisory for gusts up to 25 kt Tuesday 
afternoon. Conditions improve overnight into early Wednesday morning 
as winds shift to the northwest.

Swell periods of 11-12 seconds are expected off the coasts of 
Martha's Vineyard and Nantucket, which will lead to a higher risk of 
rip currents along south-facing beaches there, warranting expansion 
of the Rip Current Statement over the Vineyard. A moderate risk for 
rip currents extends along SE MA and RI beaches due to swells as 
well.

Outlook /Wednesday through Saturday/...

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

Wednesday Night through Thursday: Winds less than 25 kt. 

Thursday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft. Chance of rain showers, slight chance of
thunderstorms. 

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

Friday Night: Winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers. 

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents until 6 PM EDT this evening for MAZ023-
     024.
RI...None.
MARINE...Small Craft Advisory from 11 AM to 8 PM EDT Tuesday for ANZ233-
     234.

&&

$$

DISCUSSION...Frank/Dooley
AVIATION...Frank/Dooley
MARINE...Frank/Dooley