Lexington Weather

Lexington, Massachusetts, USA

67°F

6/25/2026 12:57am

Lexington Conditions: Clear
Temperature: 66.6°F / 19.2°C
Dew Point: 57.6°F
Relative Humidity: 73%
Wind: Calm, 10-min avg: Calm, gust: 2 mph
Barometer: 29.93 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 231828
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
228 PM EDT Tue Jun 23 2026

.WHAT HAS CHANGED...
No changes to the forecast at this time.

&&

.KEY MESSAGES...


- Showers and unsettled weather taper off tonight. This will be
  followed by dry and seasonable conditions through Wednesday 
  night.

- Scattered showers and a few thunderstorms possible at times 
  Thu night into Fri. We will need to watch the risk for a few
  severe t-storms Fri PM...But only if enough instability develops.

- A few showers may linger into Sat...otherwise dry weather 
  dominates into early next week but will need to watch for MCS 
  potential given  northwest flow aloft. Warming trend as well,
  but thinking the worst of the heat may remain to our southwest. 



&&

.DISCUSSION...


KEY MESSAGE 1... Showers and unsettled weather taper off tonight. 
This will be followed by dry and seasonable conditions through 
Wednesday night.


Convergence along a frontal boundary extending southwest to 
northeast across Rhode Island and southeast MA will continue to 
support wet/unsettled weather through this afternoon. No widespread 
shower or thunderstorm activity expected, but rather some fog, low 
clouds, and spotty showers. May see some breaks of sunshine across 
interior MA and CT as some drier air works its way in behind the 
front. Expect the front to move offshore by tomorrow morning. This 
will be followed by a beautiful Wednesday with seasonable 
temperatures in the upper 70s to low 80s, mostly sunny skies, and 
light winds. 


KEY MESSAGE 2...Scattered showers and a few thunderstorms possible 
at times Thu night into Fri. We will need to watch the risk for a 
few  severe t-storms Fri PM...But only if enough instability 
develops.

The next shortwave and associated mid level warm front will approach 
and cross the region Thu night into early Fri. There is enough 
forcing along with some elevated instability for an initial round of 
some showers and perhaps a few thunderstorms sometime Thu night into 
early Fri. Uncertainty prevails at this time range on the areal 
coverage of any of this activity. This will be followed by a 
potential second round of scattered showers and a few thunderstorms 
Fri afternoon and evening. This potential will be determined by how 
much instability we can generate along with forcing along the 
approaching pre-frontal/cold front. The SPC SREF is showing some 
impressive probabilities of effective shear exceeding 40 knots Fri 
afternoon. However...it remains to be seen if we will have enough 
instability and favorable time for any severe weather. 
Regardless...much of the machine learning guidance indicating some 
low probabilities so bears watching. 

KEY MESSAGE 3...A few showers may linger into Sat...otherwise dry 
weather dominates into early next week but will need to watch for 
MCS potential given northwest flow aloft. Warming trend as well, but 
thinking the worst of the heat may remain to our southwest. 

Still some timing differences on the cold front and if another wave 
of low pressure impacts us Sat as the front sags southward. So there 
is the possibility for some lingering showers Sat if the front is on 
the slower side especially near the south coast. Otherwise...the 
main weather story for the first half of next week will be an upper 
level ridge of high pressure building across the Ohio Valley. This 
will place us in northwest flow aloft...so we will need to watch for 
the potential to be impacted by an MCS sometime during the first 
half of next week. Whether or not this occurs though will depend on 
where exactly the ring of fire sets up. In terms of temperatures... 
the GFS is quite aggressive in bringing near record heat to our 
region by the middle of next week. While we do expect a warming 
trend...thinking the GFS/CMC ensembles are more realistic keeping 
the worst of the heat to our southwest given lingering trough to 
our east over the Atlantic. 

&&

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

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

18Z Update

Through 06Z

Moderate confidence at best. 

Widespread MVFR/IFR ceilings with embedded MVFR/IFR vsbys in FOG
and -SHRA through 00Z. Some uncertainty with respect to timing
of improvements, but likely lingering MVFR for most of the
evening through about 06-08Z. Shower activity should wane after
00Z across the interior with Cape/Islands terminals experiencing
showers through 06-08Z. 

06Z Tonight Through Tomorrow Night

Showers exit west to east between 06-09Z tonight. This will be
followed by VFR conditions, mainly clear skies, and light
northerly winds through tomorrow night.

KBOS Terminal...Moderate Confidence. 

Low confidence with respect to timing of ceilings rising to
VFR, but most likely by 06-08Z.

KBDL Terminal...High Confidence.

Outlook /Wednesday Night through Sunday/...

Thursday: VFR. 

Thursday Night: Mainly VFR, with local MVFR possible. Chance
SHRA.

Friday: Mainly VFR, with local MVFR possible. Breezy. Chance
SHRA, slight chance TSRA.

Friday Night: Mainly VFR, with local MVFR possible. Chance
SHRA.

Saturday: VFR. Chance SHRA.

Saturday Night: VFR. Slight chance SHRA.

Sunday: VFR. 

&&

.MARINE...
Forecaster Confidence Levels...

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

Tonight through Tomorrow Night

Some showers and possible a rumble of thunder over the south coastal 
waters this evening as an area of low-pressure slowly moves 
east/northeast this evening. Winds are generally light through this 
period varying in direction with a westerly component. Sustained 
speeds and gusts less than 20 through tomorrow night with seas 2-4 
feet.Outlook /Wednesday Night through Sunday/...

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

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

Friday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers, slight chance of thunderstorms. 

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

Saturday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft. Slight chance of rain showers. 

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.

&&

$$

DISCUSSION...Frank/RM
AVIATION...Frank/RM
MARINE...Frank/RM