Lexington Weather

Lexington, Massachusetts, USA

50°F

10/12/2026 4:23am

Lexington Conditions: Mist, Overcast
Temperature: 49.6°F / 9.8°C
Dew Point: 48.6°F
Relative Humidity: 96%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.76 in Steady
Visibility: 6 miles
Rain Today: 0.21 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 120459
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1259 AM EDT Mon Oct 12 2026

.WHAT HAS CHANGED...
No significant changes.

&&

.KEY MESSAGES...

- Rain leftover from Hurricane Isaias continues through tonight 
  before moving offshore Monday followed by a quick warm up in 
  temperatures.

- A few rounds of showers this week, first later Tuesday into 
  Tuesday night, then around Friday into Saturday.

&&

.DISCUSSION...
KEY MESSAGE 1...Rain leftover from Hurricane Isaias continues  
through tonight before moving offshore Monday followed by a 
quick warm up in temperatures.

The remnants of Hurricane Isaias continue to spread into eastern 
MA this afternoon as the center of the low strengthens and
passes north of the 40/70 benchmark later tonight. Starting to
see some heavier rain bands setting up across southern CT and
RI, slowly pushing north and east into MA, and see some rainfall 
rates of up to 0.5 inch per hour could be possible at times. 
Expecting moderate to heavy rain through midnight before 
lightening up in the early morning hours Monday, then finally 
pushing offshore late Monday morning or early afternoon. 
Widespread rainfall totals of 0.75"-1" is expected, as high as 
1.5" along the immediate south coast.

Skies will clear quickly behind the low thanks to some mid-level 
dry air moving in from the north, allowing for a quick warm-up
tomorrow afternoon. Monday's high temperatures rise into the
upper 60s, possibly the low 70s in the CT River Valley.

KEY MESSAGE 2...A few rounds of showers this week, first later 
Tuesday into Tuesday night, then around Friday into Saturday. 

Our region should then get clipped by a pair of low pressures, 
each taking a different track. The first should pass from the 
Great Lakes across northern New England Tuesday into Tuesday 
night. The risk for showers arrives across northern MA during 
the morning, then gradually moves south Tuesday night as the 
associated cold front approaches. Drying out Wednesday as this 
front finally moves farther offshore during the day. Expecting 
Wednesday to have above normal temperatures prior to this cold 
front moving by.

High pressure over eastern Canada should briefly take over our 
weather Wednesday night into Thursday night. Temperatures 
expected to trend below normal for Thursday.

The forecast for next Friday and Saturday still has timing
uncertainties. That said, the latest guidance suite started to
converge toward a common track and timing solution. The most
likely period for rainfall still looks to be between noon Friday 
and midnight Saturday. Some questions to how quickly it dries 
out on Saturday, but most of the guidance suite is more
progressing than the GFS. Favored the consensus solution in this 
regard.

Turning noticeably cooler this weekend, especially Saturday 
night into Sunday.

&&

.AVIATION /06Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...

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

06Z update...

Through 12Z: High confidence. 

RA comes to an end by 12Z. 

Monday: High confidence. 

N winds 5-10 kts. IFR cigs to start, lifting to VFR from west 
to east after 12Z (western MA/CT) to 19Z (Cape Cod and 
Islands).

Monday night: High confidence. 

Light winds increasing and becoming NE 5-10 kts toward 12Z.
Scattered SHRA/DZ moves in with IFR/MVFR. 

Tuesday: High confidence. 

IFR/MVFR. E winds becoming S 5-10kts in scattered SHRA. 

KBOS Terminal...High confidence in trends, moderate confidence
in timing. Biggest question will be how quickly RA ends and cigs
lift..most likely rain ending by 11Z and VFR by 15z. 

KBDL Terminal...High confidence in TAF.

Outlook /Tuesday through Friday/...

Tuesday: Mainly VFR, with local IFR possible. Chance SHRA.

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

Wednesday through Thursday: VFR. Breezy. 

Thursday Night: VFR. Slight chance SHRA.

Friday: Mainly VFR, with local IFR possible. Windy with local
gusts up to 30 kt. Chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Monday: High confidence.

The remnants of Hurricane Isaias are currently working their 
way across the southern waters. Seas build 5 to 10 ft and wind 
gusts 23 to 30 knots by tonight. SCAs are in effect starting 
8PM this evening for the southern waters, 15-20 kts with gusts 
to 25kt possible, especially on the southern outer waters. Seas 
6-9 ft on southern waters, 3-6 ft on the eastern waters.

Outlook /Tuesday through Friday/...

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

Tuesday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Seas up to 5 ft. Chance of rain showers,
slight chance of thunderstorms. 

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. Seas up to 5 ft. 

Thursday: Low risk for Small Craft Advisory winds with gusts up
to 30 kt. Local rough seas. 

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

Friday: Low risk for Small Craft Advisory winds with local
gusts up to 30 kt. Seas up to 5 ft. Chance of rain showers.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 11 PM EDT this evening for ANZ235-
     237-254>256.

&&

$$

DISCUSSION...Belk/McMinn
AVIATION...BW
MARINE...Belk/McMinn