Lexington Weather

Lexington, Massachusetts, USA

63°F

6/10/2026 5:31am

Lexington Conditions: Clear
Temperature: 63.0°F / 17.2°C
Dew Point: 54.1°F
Relative Humidity: 73%
Wind: Calm, 10-min avg: Calm, gust: 1 mph
Barometer: 29.87 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 090748
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
348 AM EDT Tue Jun 9 2026

.WHAT HAS CHANGED...
No significant forecast changes.

&&

.KEY MESSAGES...

- Dry conditions and low humidity continue through tonight
  leading to another pleasant day.

- Diurnal thunderstorms possible Wednesday through Friday,
  with above normal temperatures peaking on Friday.

- Temperatures remain warm, but humidity decreases, throughout 
  the weekend, while uncertainty remains high regarding 
  potential for rain showers.

&&

.DISCUSSION...
KEY MESSAGE 1...Dry conditions and low humidity continue 
through tonight leading to another pleasant day.

The high pressure system sitting south of Long Island will 
continue to slowly meander further south throughout today, 
allowing for the continuation of dry conditions and mostly clear
skies. Temperatures will continue to warm over the next week, 
aided by southwesterly flow, bringing today's high temperatures 
well into the 80s, with the exception of the immediate south 
coast, Cape, and Islands, where temperatures should remain in 
the low to mid 70s. Dewpoints will remain generally below 55, so
humidity levels will remain quite comfortable despite the warm 
temperatures.

KEY MESSAGE 2...Diurnal thunderstorms possible Wednesday 
through Friday, with above normal temperatures peaking on 
Friday.

As the high pressure system moves south, dew points will surge 
generally in the mid to upper 60s... possible to near 70 degrees
in some areas. While the combination of heat and humidity will 
create enough instability for elevated chances for the 
development of scattered showers and thunderstorms, several weak
disturbances moving through the upper atmosphere could help 
trigger this activity, particularly during the afternoon and 
evening hours.

There remains little indication of a widespread severe weather 
event at this time. Guidance continues to indicate a possible 
weak warm front, somewhat limited instability, and weaker wind 
shear on Friday. Even so, a few stronger storms cannot be ruled 
out. The latest CSU machine-learning guidance continues to 
indicate a 5 to 15 percent probability of severe weather 
Thursday into Friday, with slightly higher probabilities of 15 
to 30 percent across portions of Connecticut. Forecast 
confidence regarding thunderstorm coverage and intensity should 
improve as higher-resolution guidance becomes available over the
next couple of days.

Confidence is slowly increasing that heat and humidity could 
pose a risk, especially Thursday and Friday when heat index 
values may approach 100 degrees in parts of the Connecticut 
River Valley. These values are associated with moderate to major
heat impacts, increasing the risk of heat-related illness for 
anyone spending extended time outdoors without adequate 
hydration or access to cooling.

KEY MESSAGE 3...Temperatures remain warm, but humidity 
decreases, throughout the weekend, while uncertainty remains 
high regarding potential for rain showers.

By the weekend, a mid-level ridge is expected to strengthen 
over southern New England, promoting rising heights aloft and a 
somewhat drier air mass. Some ensemble guidance is even 
indicating a quick low spinning up over southern New England 
Saturday or Sunday, which introduces the potential for some 
spotty rain showers. Regardless, temperatures will remain quite 
warm, but dew points should fall back into the 50s, resulting in
noticeably more comfortable conditions.

&&

.AVIATION /07Z TUESDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...

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

06Z TAF Update...

Through Wednesday Morning...High confidence.

VFR conditions continue through Wed morning. SW-ly winds with 
some 20-25 knot gusts during the day Tuesday, the strongest of 
which will be focused near the south coast and upper Cape. CIGS 
start to lower Wednesday from west to east as a warm front lifts
through southern New England, but should remain VFR through at 
least Wed morning.

KBOS Terminal...High confidence. 

KBDL Terminal...High confidence.

Outlook /Wednesday Night through Saturday/...

Wednesday Night: Mainly VFR, with areas IFR possible. Breezy.
Chance SHRA, slight chance TSRA.

Thursday: VFR. Chance SHRA, slight chance TSRA.

Thursday Night through Friday: Mainly VFR, with local MVFR
possible. Slight chance SHRA, slight chance TSRA.

Friday Night: VFR. Chance SHRA, slight chance TSRA.

Saturday: VFR. Slight chance SHRA, slight chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Wednesday Morning...High confidence.

High pressure centered across the mid-Atlantic states will 
continue to slowly sink southward through Tuesday night, with 
winds already shifting SW. Good mixing over the land should 
yield SW wind gusts around 25 knots across our nearshore 
southern waters Tuesday afternoon, prompting the continuation of
Small Craft Advisories. The rest of the region should generally
remain below small craft advisory criteria through Wednesday 
morning.

Outlook /Wednesday Night through Saturday/...

Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Rain showers, slight chance
of thunderstorms. 

Thursday: Winds less than 25 kt. Local rough seas. Slight
chance of rain showers, slight chance of thunderstorms. 

Thursday Night: Winds less than 25 kt. Seas up to 5 ft. Chance
of rain showers, slight chance of thunderstorms. 

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

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 10 AM this morning to 7 PM EDT this 
     evening for ANZ231>236.

&&

$$

DISCUSSION...McMinn
AVIATION...McMinn
MARINE...McMinn