Lexington Weather

Lexington, Massachusetts, USA

77°F

7/15/2026 2:07am

Lexington Conditions: Overcast
Temperature: 77.2°F / 25.1°C
Dew Point: 71.2°F
Relative Humidity: 82%
Wind: Calm, 10-min avg: Calm, gust: 2 mph
Barometer: 29.67 in Falling Slowly
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 131315
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
915 AM EDT Mon Jul 13 2026

.WHAT HAS CHANGED...
A Heat Advisory has been issued Tuesday into Wednesday for much
of southern New England. Heat Indices are likely to reach 
100-103 in some areas.

&&

.KEY MESSAGES...

- Dry and comfortable conditions continue today.

- Heat and humidity return midweek. Heat Advisories go into
  effect Tuesday morning through Wednesday evening.

- Periods of unsettled weather possible later this week as an 
  upper level trough pushes over the region.

&&

.DISCUSSION...
KEY MESSAGE 1...Dry and comfortable conditions continue today.

Broad high pressure continue to sit of New England today, 
pushing offshore later tonight. Some low-end PoPs across 
northern and western MA have been included due to the passage of
a weak shortwave trough later this afternoon, but any showers 
will be scattered and sub-severe in nature. Otherwise, most 
areas will remain dry through the day, and south-southwesterly 
flow will allow for temperatures in the mid to uppers 80s with 
heat indices in the upper 80s to low 90s.

KEY MESSAGE 2...Heat and humidity return midweek. Heat 
Advisories go into effect Tuesday morning through Wednesday 
evening.

Broad mid-level high pressure over the Upper Midwest Tuesday 
with ridging extending all the way out to New England will bring
a period of rising heat through Wednesday. 850mb temperatures 
rise to near +23C by Tuesday evening, allowing for surface 
temperatures to soar into the mid 90s across southern New 
England both Tuesday and Wednesday. Prolonged southwesterly flow
will also surge dewpoints to near 70. Combined with poor 
overnight relief Tuesday night with low temperatures likely 
remaining in the mid 70s to near 80 in some areas, Heat 
Advisories have been issued across most of southern New England 
(excluding the Cape/Islands and eastern slopes of the 
Berkshires) for Tuesday morning through Wednesday evening. While
not as intense as the previous stretch of hot weather, 
temperatures of this magnitude will still present significant 
risks for those working or doing recreation outdoors.

KEY MESSAGE 3...Periods of unsettled weather possible later 
this week as an upper level trough pushes over the region. 

Ensemble guidance continues to indicate an amplifying upper-
level trough across Quebec later on in the week, allowing cooler
850mb temps around +10C to +13C to prevail. This will help cool
surface temperature to the low to mid 80s by Friday (upper 80s 
across the CT River Valley). Several weak shortwaves pushing 
through with the trough bring chances for precipitation and 
unsettled weather by the end of the week and into the weekend.

&&

.AVIATION /12Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...

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

Through Tuesday Morning: High Confidence.

VFR conditions are expected across all terminals today. Winds
will increase out of the SW with gusts 20-25kt this afternoon.
Overnight, LLWS may be possible for a few hours across the SE 
MA terminals as SW winds drop to 10 kts or less after midnight.
A few pop-up showers may be possible across the area, however
probability of coverage is not high enough to include in the
TAFs at this time.

KBOS Terminal...High Confidence.

KBDL Terminal...High confidence.

Outlook /Tuesday through Friday/...

Tuesday: VFR. Windy with areas of gusts up to 30 kt. 

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

Wednesday: VFR. Breezy. 

Wednesday Night: VFR. 

Thursday through Thursday Night: VFR. Breezy. 

Friday: VFR.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Tuesday...High confidence.

High pressure moves offshore later today with southwest winds 
increasing across the coastal waters. SCA have been issued 
Tuesday, with gusty southwest winds 25-30 kts across the 
southern and eastern waters. Seas will be quite choppy Tuesday 
into Wednesday morning as well, with wave heights 5-8 ft 
possible across the southern ocean waters and 3-5 ft along the 
coastal waters, including Vineyard and Nantucket Sounds.

Outlook /Tuesday through Friday/...

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

Wednesday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft. Slight chance of rain showers. 

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

Thursday Night through Friday: Winds less than 25 kt.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory from 11 AM Tuesday to 8 PM EDT Wednesday for 
     CTZ002>004.
MA...Heat Advisory from 11 AM Tuesday to 8 PM EDT Wednesday for 
     MAZ003>007-010>021-026.
RI...Heat Advisory from 11 AM Tuesday to 8 PM EDT Wednesday for 
     RIZ001>007.
MARINE...Small Craft Advisory from 4 PM to 11 PM EDT Tuesday for ANZ231-
     250.
     Small Craft Advisory from noon Tuesday to 11 AM EDT Wednesday 
     for ANZ232-233-235-237-254>256.
     Small Craft Advisory from noon Tuesday to 5 AM EDT Wednesday 
     for ANZ234.

&&

$$

DISCUSSION...McMinn
AVIATION...Guest
MARINE...McMinn