Lexington Weather

Lexington, Massachusetts, USA

84°F

5/27/2026 3:52pm

Lexington Conditions: Partly cloudy
Temperature: 83.8°F / 28.8°C
Dew Point: 61.5°F
Feels Like: 84.4°F
Relative Humidity: 47%
Wind: S 1 mph, 10-min avg: Calm, gust: 2 mph
Barometer: 29.62 in Falling Slowly
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 241737
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
137 PM EDT Sun May 24 2026

.WHAT HAS CHANGED...
Risk for showers with brief heavy rain and an isolated
thunderstorm possible Monday morning, lingering into early 
afternoon across RI and eastern MA. 

&&

.KEY MESSAGES...

- Steady rain Sunday afternoon transitions to drizzle and fog 
  overnight. 

- Showers Monday morning with brief downpours and a thunderstorm 
  possible, transitions to drier weather in the mid to late 
  afternoon from west to east. Warmer and more humid Monday with 
  partial sunshine late. 

&&

.DISCUSSION...

KEY MESSAGE 1...Steady rain Sunday afternoon transitions to 
drizzle and fog overnight. 

Large warm frontal rain shield over SNE this afternoon, being driven 
by a modest 35-45 kt low level SE jet off the Atlantic. This jet is 
resulting in breezy conditions along the coast, with ESE winds 
gusting to 20-25 mph at times. Winds will slacken later this evening 
and overnight, as this jet exits offshore overnight. Thus, steady 
rains this afternoon and evening will transition to more of a spotty 
light rain/drizzle overnight. As a warm front approaches from the 
south, could see some areas of dense fog develop tonight.  

KEY MESSAGE 2...Showers Monday morning with brief downpours and a 
thunderstorm possible, transitions to drier weather in the mid to 
late afternoon from west to east. Warmer and more humid Monday with 
partial sunshine late.  

Warm front lifts north through the region Monday morning. Warm 
sector airmass will be accompanied by dew pts in the 60s, so it will 
feel warmer and more humid Monday. Short wave trough and 
accompanying cold front move through the region later in the morning 
and into the afternoon, from west to east. Modest synoptic and 
frontal scale forcing, coupled with copious deep layer moisture (dew 
pts in the 60s and PWATs 1.75-2.0 inches) along with some 
instability, will yield showers with embedded heavier rain/downpours 
and a low risk of an isolated thunderstorm. Not expecting any 
flooding (other than nuisance, minor urban/street) but more 
beneficial rains, with an additional 0.35 to 0.75 inches of rainfall 
tonight into Monday. Isolated higher amounts possible if any 
thunderstorms develop. Good column drying behind the FROPA 18z-00z 
from west to east, with PWATs crashing and yielding clouds giving 
way to breaks of sunshine from west to east mid to late afternoon. 
This should support highs of 70-75 and with dew pts in the 60s, 
it will feel considerably warmer than previous days. 

&&

.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...

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

18Z update...

This afternoon and tonight: High confidence. 

MVFR/IFR in steady light rain this afternoon, continues to lower to 
widespread IFR this evening and tonight, with marginal IFR/LIFR at 
times in drizzle/spotty light rain and areas of dense fog. Marginal 
LLWS this afternoon and evening from low level SE jet of 35-45 kt, 
ends after 00z-03z west to east as low level jet moves offshore. 
This jet will result in ENE surface winds gusting up to 20-30 kt at 
times at coastal terminals until 00z-03z, then slackening 
thereafter.  

Monday: High confidence in trends. Moderate confidence in 
exact timing.

LIFR/LIFR at 12z Monday in drizzle/areas of rain and fog. As cold 
front approaches from the west, showers become widespread along with 
embedded heavier rain and low prob of -TSRA. After 15z LIFR/IFR 
begin to lift to IFR/MVFR and eventually VFR 18z-00z from west to 
east. SSW winds in the morning become west in the afternoon with the 
FROPA. 

Monday night: High confidence. 

Light west wind becoming NNW late. Any lingering IFR/MVFR over Cape 
Cod and Islands at 00z, will improve to VFR with the wind shift from 
SW to west and eventually NNW overnight. Low prob of MVFR in patchy 
fog overnight. 

KBOS...High confidence in TAF. Marginal LLWS (WS020 15040KT) 00z-03z 
Monday. 

KBDL...High confidence in TAF. Marginal LLWS (WS020 14040KT) 00z-03z 
Monday. 

Outlook /Tuesday through Friday/...

Tuesday through Tuesday Night: VFR. 

Wednesday: VFR. Breezy. Slight chance SHRA.

Wednesday Night: VFR. 

Thursday: VFR. Slight chance SHRA.

Thursday Night: VFR. 

Friday: VFR. Slight chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

130 PM update...

Sunday afternoon and night...

SCAs remain in effect for most waters, with east winds gusting up to 
20-30 kt at times Sunday afternoon and evening, then diminishing 8 
pm to 1 am from west to east Sunday night. Rain and fog lowering 
vsby 1 to 3 miles this afternoon, then less than 1 mile at times 
tonight in areas of fog and drizzle/light rain. The long easterly 
fetch of winds will build seas 5-8 ft across the ocean waters of 
RI/MA. 

Monday and Mon night...

Showers with embedded heavy rain, areas of dense fog and low risk of 
an isolated thunderstorm in the morning, lingering into the 
early/mid afternoon for the southern waters. Then followed by 
drier/improving weather 2-5 pm from northwest to southeast (later 
south of the islands). Wind shift from SSW in the morning, to west 
in the afternoon and evening, then NNW overnight.  

Outlook /Tuesday through Friday/...

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

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

Wednesday: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain showers. 

Wednesday Night: Winds less than 25 kt. 

Thursday: Winds less than 25 kt. Slight chance of rain showers.

Thursday Night: Winds less than 25 kt. 

Friday: Winds less than 25 kt. Slight chance of rain showers. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 2 AM EDT Monday for ANZ231.
     Small Craft Advisory until 5 AM EDT Monday for ANZ232>235-237.
     Small Craft Advisory from 5 PM this afternoon to 8 PM EDT 
     Monday for ANZ250.
     Small Craft Advisory until 8 PM EDT Monday for ANZ254>256.

&&

$$

DISCUSSION...Nocera
AVIATION...Nocera
MARINE...Nocera