Lexington Weather

Lexington, Massachusetts, USA

75°F

7/13/2026 11:45pm

Lexington Conditions: Clear
Temperature: 74.5°F / 23.6°C
Dew Point: 62.8°F
Relative Humidity: 67%
Wind: Calm, 10-min avg: Calm, gust: 1 mph
Barometer: 29.99 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Southeast Middlesex County, MA - Heat Advisory
- SEE ALL NEARBY ALERTS -

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 110547
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
147 AM EDT Sat Jul 11 2026

.WHAT HAS CHANGED...
No changes to the forecast for this update cycle.

&&

.KEY MESSAGES...

- Dry and seasonable weather with low humidity levels this weekend 
into Monday.

- Heat and humidity return by midweek.

&&

.DISCUSSION...

KEY MESSAGE 1...Dry and seasonable weather with low humidity levels 
this weekend into Monday.

Areas of patchy fog from lingering moisture quickly mix out this 
morning as surface high pressure builds over the region and becomes 
centered over New England Sunday into Monday. A more comfortable 
airmass under this feature brings temperatures in the mid 80s and 
low humidity with dew points in the upper 50s/low 60s. The drier air 
mass will keep rain chances to near zero before moisture returns 
later in the week. A disturbance sliding well to the S of the region 
may provide a few high clouds across the S coast later Saturday, but 
impacts from weather will be very limited this weekend. 

KEY MESSAGE 2...Heat and humidity return by midweek. 

Mid-level high pressure ridging will remain over the Central U.S., 
stretching across into the Mid Atlantic through much of next week, 
bringing mostly hot and dry weather across the Northeast. Hot 
temperatures in the low to mid 90s will return mid week with 850mb 
temperatures ranging from +18 to +22C. We may need to consider a 
period of heat headlines with dew points rising into the mid to 
upper 60s again.

Rain chances through the period will generally remain low with a 
better chance on Tuesday into Wednesday with a possible shortwave 
trough moving through Northern New England. Southerly return flow at 
the surface will be short lived prior to this perturbation moving 
through, so moisture depth will remain shallow. Models are showing 
possible deeper upper-level troughing toward the end of the week, so 
we may start to see increasing rain chances and slightly cooler 
temperatures if that trend continues.


&&

.AVIATION /06Z SATURDAY THROUGH WEDNESDAY/...
Forecaster Confidence Levels...

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

Through tonight: Moderate confidence. 

Winds calm through the early morning hours, with patchy fog and
low ceilings developing at southern terminals after 09z. Fog
mixes out quickly between 12 and 14z. 

Saturday: High confidence.

MVFR/IFR at ACK will improve to VFR this morning.

Elsewhere VFR. Light E to NE winds.

KBOS Terminal...Moderate confidence. Lighter winds expected 
today with possibly an isolated shower with the seabreeze, but 
have decided to keep any mention out of the TAF at this time.

KBDL Terminal...High confidence. VFR with light winds.

Outlook /Sunday Night through Wednesday/...

Sunday Night: VFR. 

Monday through Monday Night: VFR. Breezy. 

Tuesday through Tuesday Night: VFR. Windy with local gusts up
to 30 kt. 

Wednesday: VFR. Breezy. 

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Saturday Night...High confidence.

Mostly tranquil boating conditions continue into next week. A 
weak cold front should cross the waters tonight. Mainly dry 
weather today into next Wed. Could see areas of SCA conditions
by next Tuesday with increasing SW winds. 

Outlook /Sunday Night through Wednesday/...

Sunday Night through Monday: Winds less than 25 kt. 

Monday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Areas of seas approaching 5 ft. 

Tuesday: Moderate risk for Small Craft Advisory winds with
gusts up to 30 kt. Seas up to 5 ft. 

Tuesday Night: Moderate risk for Small Craft Advisory winds
with gusts up to 30 kt. Rough seas up to 9 ft. 

Wednesday: Moderate risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of rough seas. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.

&&

$$

DISCUSSION...FT
AVIATION...FT
MARINE...FT