Lexington Weather

Lexington, Massachusetts, USA

63°F

6/10/2026 6:08am

Lexington Conditions: Clear
Temperature: 63.0°F / 17.2°C
Dew Point: 54.9°F
Relative Humidity: 75%
Wind: Calm, 10-min avg: Calm, gust: 2 mph
Barometer: 29.87 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 051054
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
654 AM EDT Fri Jun 5 2026

.WHAT HAS CHANGED...

Continue to refine summery temperatures and timing of 
precipitation along with the risk for thunderstorms (some could
be severe) for this coming weekend.

&&

.KEY MESSAGES...

- Unseasonably warm to hot temperatures continue today and
  Saturday with dry weather persisting.

- Increasing risk for showers and a few strong to severe
  thunderstorms Saturday evening. Sunday trends somewhat warmer
  with periods of showers and possible thundershowers.

- Dry and cooler conditions return early next week with onshore
  flow, before temperatures trend more summerlike by midweek.

&&

.DISCUSSION...

KEY MESSAGE 1...Unseasonably warm to hot temperatures continue today 
and Saturday with dry weather persisting.

There are no notable changes to the near and short-term forecast 
through the daylight hours of Saturday. Confidence remains high that 
dry weather continues along with unseasonably warm to hot 
temperatures. As advertised over the past several days, the primary 
weather feature remains an area of high pressure centered across the 
southeastern CONUS, which slowly shifts offshore this weekend ahead 
of more unsettled conditions. Little has changed regarding 
temperatures aloft, with 850 mb values remaining between +13C and 
+15C Friday and increasing to +15C to +18C Saturday. Given a well-
mixed boundary layer reaching 850-800 mb, highs should climb well 
into the upper 80s to lower 90s. While temperatures aloft are warmer 
Saturday, increasing moisture and cloud cover may temper daytime 
heating somewhat. Nevertheless, temperatures remain well above 
normal for early June, when average highs are typically in the lower 
70s. A more westerly wind today should allow coastal communities to 
warm efficiently, while stronger southwest flow Saturday keeps 
southern coastal areas somewhat cooler, generally in the upper 70s 
to lower 80s. Dewpoints remain comfortable today in the 50s but rise 
into the upper 50s to lower 60s Saturday, leading to a somewhat 
muggier feel, though not overly oppressive.

For those heading to the beaches, there is a moderate risk for rip 
currents Saturday along east-facing beaches of Cape Cod, ocean-
facing beaches of Nantucket and Marthas Vineyard, and south-facing 
beaches from Point Judith, RI to Westport, MA. Always check with 
lifeguards regarding local rip current conditions.

KEY MESSAGE 2...Increasing risk for showers and a few strong to 
severe thunderstorms Saturday evening. Sunday trends somewhat warmer 
with periods of showers and possible thundershowers.

Confidence continues to increase that most, if not all, of the 
daylight hours Saturday remain dry, though a brief afternoon shower 
cannot be ruled out north and west of the I-91 corridor, likely 
associated with a prefrontal trough. Increasing heat and humidity 
will lead to a moderately unstable atmosphere, with CAPE values 
between 500-1000 J/kg, though some guidance suggests locally higher 
values approaching 1500 J/kg. This should support convective 
initiation by late afternoon, though activity may hold together 
after sunset given modest mid-level lapse rates around 6.5-7.5 C/km. 
The better wind shear arrives Saturday evening, with 0-6 km bulk 
shear increasing to around 30-40 kt. Given this setup, a marginal 
risk for severe thunderstorms has been introduced for southern New 
England, with the primary threats being strong to damaging straight-
line winds and locally heavy downpours as PWAT values climb to 
around 1.8 inches. CAM guidance is beginning to resolve this 
timeframe, though refinement in storm timing and placement is still 
expected.

By Sunday morning, weak subsidence behind the front may allow for 
drier, albeit humid, conditions with a mix of clouds and sunshine. 
By afternoon, a more defined mid-level trough and associated 
shortwave energy move across southern New England, though recent 
guidance trends the surface low farther north into the Gulf of 
Maine. As a result, rainfall appears more showery and less 
widespread, with the greatest concentration of showers and general 
thunder across eastern portions of southern New England. Cooler air 
arrives more gradually, which may allow highs to still reach the 
upper 70s to lower 80s before northeast flow develops later in the 
day.

KEY MESSAGE 3...Dry and cooler conditions return early next week 
with onshore flow, before temperatures trend more summerlike by 
midweek.

Conditions trend drier and cooler Monday, though some uncertainty 
remains regarding how quickly lingering troughing departs, which 
will influence temperatures and cloud cover. For now, expect cooler 
conditions Monday with a warming trend returning Tuesday into the 
middle of next week as temperatures return into the 80s. High 
pressure appears likely to return by Tuesday, supporting mainly dry 
weather through midweek.

&&

.AVIATION /12Z FRIDAY THROUGH TUESDAY/...

Forecaster Confidence Levels...

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

12z TAF Update...

Today and Tonight...High confidence.

VFR conditions continue through tonight. W winds generally 5 to
10 knots today...But with sea breezes developing along portions
of the immediate coast roughly between 15z and 17z. Winds
become light southerly/calm tonight. 

Saturday...High confidence.

VFR conditions outside of an afternoon shower or t-storm.
Greater risk for scattered showers and t-storms a few of which
may be strong to severe will be after 21z/22z until about 03z
particularly across interior MA and CT. SW wind gusts of 20 to
25 knots develop by afternoon...But localized stronger wind
gusts possible in any thunderstorm. 

KBOS...High confidence in TAF.

KBDL...High confidence in TAF.

Outlook /Sunday through Tuesday/...

Sunday: VFR. Breezy. Chance SHRA, isolated TSRA.

Sunday Night: Mainly VFR, with local MVFR possible. Breezy.
Slight chance SHRA.

Monday: VFR. Breezy. 

Monday Night through Tuesday: VFR.

&&

.MARINE...
Forecaster Confidence Levels...

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

Today through Saturday...High confidence.

Today, winds remain similar to Thursdays setup, though generally 
expected to remain just below Small Craft Advisory criteria across 
Buzzards Bay, Vineyard Sound, and Nantucket Sound. Across the 
remaining waters, winds up to 20 kt are possible through this 
evening, then all waters should remain at or below 15 kt on Friday 
and Friday night. Seas generally hold in the 2-4 ft range through 
Friday night.

On Saturday, southwest winds increase with gusts approaching 25 kt 
and seas building to 3-5 ft by early afternoon. It is becoming more 
likely that Small Craft Advisory conditions will be needed Saturday 
afternoon into the weekend as these conditions develop.

Outlook /Saturday Night through Tuesday/...

Saturday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers. 

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

Sunday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain
showers. 

Monday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Seas up to 5 ft. 

Monday Night: Winds less than 25 kt. Seas up to 5 ft. 

Tuesday: Winds less than 25 kt. Local rough seas.

&&

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

&&

$$

DISCUSSION...Dooley
AVIATION...Frank
MARINE...Dooley