Lexington Weather

Lexington, Massachusetts, USA

66°F

8/24/2026 6:41am

Lexington Conditions: Mist, Overcast
Temperature: 65.8°F / 18.8°C
Dew Point: 64.6°F
Relative Humidity: 96%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.85 in Steady
Visibility: 2 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 171830
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
230 PM EDT Mon Aug 17 2026

.WHAT HAS CHANGED...
A Rip Current Statement has been issued for east-facing beaches from 
9 am to 8 pm Tuesday. 

&&

.KEY MESSAGES...

- Fair and less humid Tuesday with gradual clearing. A high risk
  of rip currents develops across east-facing beaches by Tuesday
  afternoon.

-  No washouts expected, though several opportunities for
   showers return from mid to late week.

&&

.DISCUSSION...
KEY MESSAGE 1...Fair and less humid Tuesday with gradual clearing. A 
high risk of rip currents develops across east-facing beaches by 
Tuesday afternoon. 

Gradual clearing develops from W to E Tuesday as low pressure slowly 
pulls away from the region. Guidance shows areas of low clouds and 
fog lingering for much of the day across coastal areas with the help 
of cyclonic onshore flow. Thus, expecting high temperatures to stay 
in the lower to mid 70s for coastal areas, and perhaps even the 
upper 60s for the outer Cape. It will be quite humid closer to the 
coast with onshore flow advecting moisture inland. Elsewhere, it 
will be drier as the flow turns to the NW through the day. Further 
inland, it looks to be a warmer and drier day with highs in the low 
to mid 80s. Heat index values climb into the upper 80s to near 90 
for a time Tuesday afternoon. For those heading to the beach Tuesday 
afternoon, a Rip Current Statement is in effect for east-facing 
beaches Tuesday. Those heading to the beach should remain aware of 
local conditions and check with lifeguards or beach staff regarding 
rip current risks at their specific location.


KEY MESSAGE 2...No washouts expected, though several opportunities for showers 
return from mid to late week.

Generally zonal flow aloft prevails Wednesday 
while an upper level low tracks well north across the Hudson 
Bay. Conditions are likely to stay dry during the day with 
temperatures in the low to mid 80s. A weak piece of shortwave 
energy shifts in from the west later Wednesday. While the better
forcing remains further north and west, there is a low 
probability for an isolated shower in western MA Wednesday 
night.

Another shortwave in the flow moves through Thursday accompanied by 
better ascent and plume of above normal moisture to support showers. 
There is still some uncertainty across guidance with the track of 
the wave. The ECMWF (ens and deterministic) leans toward a more 
southern track with the higher ensemble probabilities (60-80%) for 
any rain accumulation extending across the south coast to southeast 
MA, and Cape/Islands. The GEFS/GFS has shown a wider footprint of 
showers with similar probabilities across all of southern New 
England. Any amounts are likely to range from a trace to a few 
tenths of an inch.  

We'll be in a post-frontal airmass Friday resulting in slightly 
cooler temperatures in the mid 70s to low 80s and a downtick in 
humidity. The eastern coastal areas will likely end up on the cooler 
end of that temperature range given the easterly onshore flow. High 
pressure builds in from the west bringing dry conditions to most of 
the region. However, there are indications across model guidance of 
a boundary stalling off the east coast with a series of embedded 
shortwaves riding that boundary Friday through the weekend. This may 
bring periodic chances for showers, perhaps some thunderstorms if 
the waves align with diurnal heating. The higher risk for 
showers will the for south coast extending to Cape Cod/Islands. 

&&

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

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

This afternoon into Tonight...Moderate confidence in trends, 
lower confidence in timing.

Pockets of IFR developing as winds shift to the SE and E, mainly
across coastal terminals. Potential for LIFR for the Cape and
Islands overnight. Light northerly winds, becoming calm across 
the interior. 

Tuesday...Moderate confidence.

MVFR to IFR conditions to start, with improvement to VFR from west 
to east between 15Z and 20Z. Eastern terminals, including Cape Cod, 
may experience a later improvement to VFR, possibly not until 22Z to 
00Z. Light northwest winds across the interior, with north to north-
northeast winds across eastern Massachusetts at less than 10 kt.

KBOS Terminal...Moderate confidence.

MVFR until 21z, then IFR with SE winds shifting to the E after
00z. IFR conditions continue overnight with winds shifting to
the NE and eventually N after 12z. 

KBDL Terminal...Moderate confidence.

MVFR conditions through the overnight. Low chance for FG at the
terminal. Light and variable winds.

Outlook /Wednesday through Saturday/...

Wednesday through Wednesday Night: VFR. 

Thursday through Friday: VFR. Chance SHRA.

Friday Night: VFR. Slight chance SHRA.

Saturday: VFR. Chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Tuesday Night...Moderate confidence.

SCA conditions subside Tuesday as low pressure shifts farther 
east. Seas subside to 2 to 4 ft, with light northerly to north- 
northwest winds generally less than 15 kt. High risk of rip
currents for east-facing beaches across E Massachusetts as well
as the Cape and Nantucket. 

Outlook /Wednesday through Saturday/...

Wednesday through 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. Chance of rain showers,
slight chance of thunderstorms. 

Friday through Saturday: Winds less than 25 kt. Chance of rain
showers. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents from Tuesday morning through Tuesday 
     evening for MAZ007-015-016-019-022-024.
     High Risk for Rip Currents until 8 PM EDT this evening for MAZ023-
     024.
RI...High Risk for Rip Currents until 8 PM EDT this evening for 
     RIZ006>008.
MARINE...Small Craft Advisory until 8 PM EDT this evening for 
     ANZ232>235-237.
     Small Craft Advisory until 2 AM EDT Tuesday for ANZ254>256.

&&

$$

DISCUSSION...Mensch/FT
AVIATION...FT/RM
MARINE...FT