Lexington Weather

Lexington, Massachusetts, USA

71°F

7/25/2026 8:01pm

Lexington Conditions: Clear
Temperature: 70.7°F / 21.5°C
Dew Point: 51.1°F
Relative Humidity: 50%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.99 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 230700
AFDBOX

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

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

&&

.KEY MESSAGES...

- Mainly dry with seasonable temperatures through the 
  weekend. 

- Unsettled weather for early to mid-week next week with 
  periodic chances for scattered showers and thunderstorms.

&&

.DISCUSSION...
KEY MESSAGE 1...Mainly dry with seasonable temperatures through the 
weekend. 

A few showers and embedded weak storms are possible over our 
coastal waters early this morning as the cold front pushes 
offshore. By sunrise, the front should be fully through pushing 
out any remaining showers. Weak mid-level troughing will persist
with drier and cooler conditions in the post-frontal airmass. 
925 mb temperatures drop a few degrees from yesterday yielding 
cooler high temperatures in the upper 70s to near 80 for 
southern New England today. The airmass will be noticeable drier
as well bringing more comfortable humidity levels as surface 
high pressure builds in from the west. This will also keep winds
on the lighter side with light NW winds and local sea breezes 
for the coastal areas.

Surface high pressure builds further over the region Friday 
continuing through the weekend with flow aloft becoming more 
zonal. Weak subsident flow will keep conditions dry. Winds 
remain light under surface high pressure with winds becoming 
easterly for the weekend. 925mb temperatures range 16-21C 
supporting highs in the low to mid 80s in most spots, perhaps a 
tad cooler in the immediate coastal areas where sea 
breezes/onshore flow will be prevalent. Surface high pressure 
pushes offshore through the day Sunday as a mid-level trough 
approaches from the west. The drier airmass should stay in place
during the day suppressing most shower development. 

KEY MESSAGE 2...Unsettled weather for early to mid-week next week 
with periodic chances for scattered showers and thunderstorms.
 
The pattern becomes more unsettled early next week with a mid-level 
trough positioned across the northeast and a series of disturbances 
moving through the flow. Overall there is a good signal for 
increasing moisture with PWATs slightly above normal which will 
support increased chances for periodic scattered showers and 
thunderstorms early next week through mid-week. Temperatures 
lean toward seasonable values in the low 80s.


&&

.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: VFR. Slight chance SHRA, slight chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Tonight through Thursday Night

Winds shift to the NW early this morning as a cold front moves
through. Scattered showers and perhaps an isolated weak storms
are possible early this morning over the coastal waters as the
front slowly shifts eastward. Majority of the showers should
exit the outer coastal waters by 12Z this AM. Winds have fallen
below SCA criteria; however, lingering 5-6 ft seas will keep
SCAs going through the afternoon for the far southern inner
waters and through tonight for the southern outer waters.

High Surf Advisory remains in effect for exposed southern 
coastlines through this evening. Prolonged period of higher 
seas and SW flow have increased the risk for rip currents. The
higher risk continues today and decreases Friday. Seas recede 
to 4 ft Thursday night with light winds over the waters.

Outlook /Friday through Monday/...

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

Friday Night: Winds less than 25 kt. 

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

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

Sunday: Winds less than 25 kt. 

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

Monday: Winds less than 25 kt. 

&&

.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 PM EDT this afternoon for ANZ235-
     237.
     Small Craft Advisory until 11 PM EDT this evening for 
     ANZ254>256.

&&

$$

DISCUSSION...Mensch
AVIATION...Mensch
MARINE...Mensch