Lexington Weather

Lexington, Massachusetts, USA

65°F

6/25/2026 2:06am

Lexington Conditions: Clear
Temperature: 64.8°F / 18.2°C
Dew Point: 57.4°F
Relative Humidity: 77%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.93 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 201813
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
213 PM EDT Sat Jun 20 2026

.WHAT HAS CHANGED...
Forecast remains on track.

&&

.KEY MESSAGES...

- While the risk for severe weather remains low, diurnal 
  thunderstorms are a possibility through the end of the 
  weekend. Otherwise, cooler with westerly breezes.

- Periods of heavy rain possible Monday into earlyTuesday. 
  Drier air with seasonable temperatures expected midweek. 
  Chances for rain return for the end of the week.


&&

.DISCUSSION...
KEY MESSAGE 1...While the risk for severe weather remains low, 
diurnal thunderstorms are a possibility through the end of the 
weekend. Otherwise, cooler with westerly breezes.

A couple of weak shortwaves embedded within broader cyclonic 
flow aloft over the next day or so will provide enough fuel to 
fire a few diurnal thunderstorms through the end of the weekend.
CAPE values today in the 500-750 J/kg range primarily over 
eastern MA will provide enough instability for a few 
thunderstorms to pop this afternoon and evening, and we're 
already seeing a few pop-ups in VT and NH. Sunday's CAPE values 
look to be 200-300 J/kg higher and a little more widespread, 
leading to more widespread shower chances than today.

Gusty westerly winds are expected to continue through this 
evening, with peak gust speeds up to 40 MPH. All thing 
considered, not much different from yesterday. Winds subside 
with sunset, and should not be as gusty Sunday. Otherwise, high 
temperatures remain seasonable through the weekend... in the 
upper 70s to low 80s.

KEY MESSAGE 2... Periods of heavy rain possible Monday into 
early Tuesday. Drier air with seasonable temperatures expected 
midweek. Chances for rain return for the end of the week.

A low pressure system will move towards the northeast during 
the beginning of the work week, pulling ample moisture 
northward, with forecast PWATs above 1.5", which falls in the 
90th percentile relative to the 30 year climatology. That said, 
this looks to be a widespread rainfall event, with the 
probability of 1 inch or more of storm total rainfall between 70
to 80 percent across southern New England, and probability for 
2+ inches of rainfall were about 30 to 50 percent, greatest 
across western MA and CT. Timing of the rain looks fairly 
consistent from the previous forecast, with most of the rain 
falling from Monday afternoon through Tuesday morning. 

High pressure builds into the region behind this system, 
providing drier with and seasonable temperatures for the middle 
of the week. Chances for rain begin to increase once again by 
the end of the work week.

&&

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

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

Today: High confidence.

VFR. WNW winds gusting up to 30 kts through sunset. Some risk 
for diurnal SHRA with brief MVFR- VFR visibilities after 18Z, 
mainly across eastern coastal terminals, including BOS. Not 
impossible for a few TSRA also.

Tonight: High confidence.

VFR, any showers diminish post-sundown. WNW winds decrease to 
5-10 kt.

Sunday...High confidence.

VFR. Relatively light west winds could lead to afternoon 
seabreezes. Another risk for afternoon showers and TSRA.

KBOS Terminal...High confidence in shower activity and moderate
confidence in the exact timing. Westerly gusts 25-30 kt 
continue through sundown.
 
KBDL Terminal...High confidence in TAF. Some diurnal showers 
are possible, but there is lower confidence on how far west they
may reach. So, excluded these showers from the TAF.

Outlook /Monday through Thursday/...

Monday: Mainly VFR, with local IFR possible. Breezy. Chance
SHRA, slight chance TSRA.

Monday Night: MVFR/IFR conditions possible. Breezy. SHRA,
slight chance TSRA.

Tuesday: VFR. Breezy. Slight chance SHRA.

Tuesday Night through Wednesday Night: VFR. 

Thursday: 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.

Small Craft Advisories remain in effect for MA and RI coastal 
waters today. Could see a few gale force gusts as well, but not 
thinking it will be prevalent enough to warrant an upgrade to 
Gale Warnings. Risk for scattered showers and isolated 
thunderstorms this evening, and again Sunday afternoon. Any 
showers and thunderstorms should diminish after sunset.

Winds and seas should trend below SCA criteria tonight.

Outlook /Monday through Thursday/...

Monday: Low risk for Small Craft Advisory winds with local
gusts up to 30 kt. Chance of rain showers. 

Monday Night: Moderate risk for Small Craft Advisory winds with
local gusts up to 30 kt. Areas of rough seas. Rain showers,
chance of thunderstorms. 

Tuesday: Winds less than 25 kt. Areas of rough seas. Chance of
rain showers, slight chance of thunderstorms. 

Tuesday Night: Winds less than 25 kt. Seas up to 5 ft. 

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

Wednesday Night through Thursday: Winds less than 25 kt. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 7 PM EDT this evening for ANZ230-
     232>235-237.
     Small Craft Advisory until 4 PM EDT this afternoon for ANZ231-
     236-250-251.
     Small Craft Advisory until 1 AM EDT Sunday for ANZ254-256.
     Small Craft Advisory until 4 AM EDT Sunday for ANZ255.

&&

$$

DISCUSSION...McMinn/Sava
AVIATION...McMinn
MARINE...McMinn