Lexington Weather

Lexington, Massachusetts, USA

37°F

1/11/2026 11:25am

Lexington Conditions: Mostly cloudy
Temperature: 37.2°F / 2.9°C
Dew Point: 36.1°F
Relative Humidity: 96%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.65 in Falling Slowly
Visibility: 10 miles
Rain Today: 0.07 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 081857
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
157 PM EST Thu Jan 8 2026

.WHAT HAS CHANGED...
Increased confidence in patchy freezing drizzle/fog that may result 
in icy conditions on untreated surfaces tonight into Friday
morning.

&&

.KEY MESSAGES...

- Areas of freezing fog tonight into Friday morning. Light rain
  overnight Friday.
 
- A low-pressure system brings a soaking rainfall 
Saturday, with rain possibly lingering into Sunday.

- A cold front brings cool and blustery conditions 
back to the region late Sunday into Monday.

&&

.DISCUSSION...
KEY MESSAGE 1...Patches of freezing fog tonight into Friday 
morning. Light rain overnight Friday. 

Surface high pressure moves offshore overnight. Light return flow 
allows dew point temperatures to rise into the upper 20s/ lower 30s. 
BUFKIT soundings show ideal conditions for fog with an inversion 
near the surface along with a saturated layer up to about 1 kft. 
Given the surface temperatures are below freezing, patchy freezing 
fog is likely late tonight into Friday morning. Thankfully, the 
freezing fog threat will quickly diminish after 12z Friday as 
surface temperatures warm above freezing. Strengthening southwest 
winds aloft result in strong WAA with 850mb temperatures rising 
between +4C to +6C Friday afternoon. As a result, it should be a 
warmer day with highs climbing into the mid and upper 40s for most 
of the region. NBM even shows areas of southern Massachusetts 
and Rhode Island touching 50F. Surface warm front moves through 
southern New England Friday night into early Saturday morning. 
Guidance still shows a broken band of showers with QPF between 
0.10 and 0.25 inches, certainly not a washout. Highest totals 
will be further to the north across northern New England, with 
the parent low pressure system. No p-type issues expected with 
this event as temperatures Friday night remain in the low-40s at
the coast and upper 30s across interior locations. 

KEY MESSAGE 2...A low-pressure system brings a soaking rainfall 
Saturday, with rain possibly lingering into Sunday.

Shortwave energy arrives well ahead of the parent shortwave back 
over the Northern Great Plains on Saturday.  This allows several 
weak surface lows to spin up along the nearshore baroclinic zone and 
bring rain to the region on Saturday.  With a warm airmass in place 
and extra moisture flowing in from the mid-Atlantic, PWATS surge to 
around 0.9 to 1.1 inches.  Best forcing and moisture will be near 
the south coast as the wave of low pressure passes just offshore. 
There is still quite a bit of spread in QPF totals, as ensembles 
show wide ranges in the 25th-75th percentiles.  Regardless, QPF will 
be highest near the south coast, where the 25th-75th percentile 
range is between .35 and 1.15 inches, while further north, the range 
is .15 to 0.55 inches.  

Saturday morning should remain dry, with rain moving in from south 
to north in the late morning to early afternoon.  Given that rain 
will begin during the daytime hours, freezing rain concerns will be 
limited, likely occurring only in pockets of the northern high 
terrain where cold air may be tough to scour out.  

Rain ends from west to east late Saturday evening into the 
overnight.  Another wave of low pressure rides up the stalled 
frontal boundary offshore, possibly bringing another round of rain 
to the south coast on Sunday.  High temperatures over the weekend 
remain mild, with mid to upper 40s on Saturday, then upper 30s to 
low 40s on Sunday.

KEY MESSAGE 3...A cold front brings cool and blustery conditions 
back to the region late Sunday into Monday.

A cold front moves through the region Sunday evening, helping clear 
out the remaining rain.  The cold front will squeeze out the 
remaining moisture from the weekend, leading to isolated snow 
showers and possibly weak snow squalls Sunday evening. Temperatures 
will crash Sunday night, bottoming out in the low to mid 20s.  Any 
remaining standing water from this weekends rain will freeze by 
Monday morning, possibly leading to some slippery conditions for the 
Monday AM commute.  High temperatures on Monday will recover into 
the low to mid 30s, but gusty west winds at 20-25mph will bring the 
wind chill index into the low 20s.

Looking ahead into next week, cool and dry conditions persist 
through Wednesday or Thursday, with the pattern possibly turning 
more active again late in the week into next weekend.

&&

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

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

18Z TAF update...

Tonight... Moderate Confidence. 

IFR/MVFR ceilings, potential for fog or freezing fog with 
visibilities lowering 1/2SM to 1SM. South wind less than 5 
knots. 

Friday... Moderate Confidence (timing of lowering ceilings). 

VFR, trending to MVFR by mid afternoon as a warm front 
approaches. Showery rain possible around and after 00z.

Friday Night...Moderate Confidence on timing of precipitation.

MVFR, potential for isolated IFR. Areas of -SHRA move in from 
W-E between 22z-00z winding down between 03-06z Friday night. 

KBOS Terminal... Moderate Confidence. 

MVFR/IFR developing tonight. West-northwest wind around 10 
Potential for dense fog tonight into 15z Friday. 

KBDL Terminal... High Confidence.

MVFR/IFR tonight, potential for fog or freezing fog tonight 
into Friday morning.

Outlook /Saturday through Tuesday/...

Saturday: Mainly VFR, with local MVFR possible. Chance RA,
chance FZRA.

Saturday Night: Mainly IFR, with areas MVFR possible. RA,
chance FZRA.

Sunday: Mainly VFR, with areas IFR possible. Breezy. Chance RA,
chance FZRA.

Sunday Night: VFR. Windy with local gusts up to 30 kt. Chance
RA, slight chance SN.

Monday: VFR. Windy with local gusts up to 30 kt. 

Monday Night through Tuesday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Today through Saturday... High Confidence. 

A lull over the waters tonight, wind increases from the south 
on Friday as a warm front lifts over the region. Gusting between
20 to 25 knots and seas increasing 4 to 6 feet by Friday night.
Small craft conditions for most of the waters except the bays
and harbors 00z to 12z Saturday. Seas calm later Saturday
morning before another system approaches from the S late Sat
into Sat night. 

Outlook /Saturday through Tuesday/...

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

Saturday Night: Winds less than 25 kt. Local rough seas. Rain. 

Sunday: Winds less than 25 kt. Areas of rough seas. Rain
likely. 

Sunday Night: Strong winds with gusts up to 40 kt. Areas of
rough seas. Chance of rain, slight chance of snow. 

Monday: Strong winds with gusts up to 35 kt. Areas of rough
seas. 

Monday Night through Tuesday: Low risk for Small Craft Advisory
winds with gusts up to 25 kt. Local rough seas.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 7 PM Friday to 3 AM EST Saturday for 
     ANZ235-237.
     Small Craft Advisory from 7 PM Friday to 7 AM EST Saturday for 
     ANZ250-254>256.

&&

$$

DISCUSSION...KP/FT
AVIATION...FT
MARINE...FT