Lexington Weather

Lexington, Massachusetts, USA

66°F

6/8/2026 10:34am

Lexington Conditions: Clear
Temperature: 65.8°F / 18.8°C
Dew Point: 54.1°F
Relative Humidity: 66%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 30.18 in Steady
Visibility: 10 miles
Rain Today: 0.01 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 011742
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
142 PM EDT Mon Jun 1 2026

.WHAT HAS CHANGED...

No significant changes to the forecast.

&&

.KEY MESSAGES...

- A few scattered showers possible both this afternoon and
  Tuesday afternoon. Tuesday begins a pattern of steadily
  climbing temperatures each day through the week. 

- Forecast confidence decreases for late this week. Conditions
  more likely to be dry and warm, but we continue to monitor the
  potential for an offshore system to bring showers this
  weekend.

&&

.DISCUSSION...

KEY MESSAGE 1...A few scattered showers possible both this afternoon 
and Tuesday afternoon. Tuesday begins a pattern of steadily climbing 
temperatures each day through the week. 

The synoptic pattern continues to feature a broad upper trough 
lingering over the Northeast with the associated cold pool leading to 
widespread diurnal cloudcover over inland areas, and even some 
decent pop-up shower coverage over western and central SNE. This 
activity will continue through sundown when skies quickly clear 
setting up for a good radiational cooling night. Given building 
surface high pressure leading to calm winds and clear skies 
overnight, the forecast has been trended toward the cooler MOS 
guidance. We're expecting lows in the upper 30s/low 40s in the 
typical cold spots, closer to 50 in the urban centers. 

Tuesday features a transition from the broader trough we've dealt 
with the last several days to a building mid level ridge. As such, 
we expect warm advection and clear to mostly sunny skies to lead to 
highs well into the 70s. That being said, a weak disturbance 
rounding the base of the exiting trough will be enough to once again 
kick off a few diurnal showers and even a thunderstorm given a few 
hundred J/kg of elevated CAPE. Expect the most sun in the morning 
before low level diurnal clouds and some mid/high clouds filter in 
in the afternoon. 

KEY MESSAGE 2...Forecast confidence decreases for late this week. 
Conditions more likely to be dry and warm, but we continue to 
monitor the potential for an offshore system to bring showers this 
weekend.

Mid level omega block expected to start breaking down Wednesday into 
Friday. The mid level flow at that point should remain rather 
amplified for an early meteorological summer pattern. There are 
significant timing differences in how short this breakdown process 
will be, which is not all that unusual. These details matter, and 
will take a more probabilistic approach with the forecast from 
Wednesday on. 

Overall, it appears that southern New England finally edges more 
into the higher heights part of the block around Wednesday, with a 
surface high pressure over the Great Lakes. Expecting dry weather 
with warmer conditions Wednesday into Friday. 

The forecast this weekend into early next week is more problematic. 
Much will depend on how quickly the aforementioned omega block 
breaks. At this time, there is a chance that we remain dry for most 
of the day Saturday. However, there are also enough signals where a 
mention of scattered afternoon showers is warranted. A low pressure 
passing by along a nearly stalled front for Sunday is a more 
favorable pattern for showers. This front could linger into Monday, 
continuing the risk for some showers. 

Temperatures should start to lower Saturday, but the cooldown is 
anticipated to be more noticeable Sunday into Monday.

&&

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

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

18Z TAF Update: 

This afternoon...High Confidence.  

VFR. NE winds 5-10 kts becoming calm this evening. 

Tonight...High Confidence. 

VFR. Light to calm winds.

Tuesday...High Confidence. 

VFR. NE 5-10 kts for inland terminals with sea breezes along the
coast. 

KBOS...High confidence in TAF. 

KBDL...High confidence in TAF.

Outlook /Wednesday through Saturday/...

Wednesday through Thursday Night: VFR. 

Friday: VFR. Breezy. 

Friday Night through Saturday: VFR. 

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Tuesday Night...High Confidence. 

NE winds 5-10 kts this afternoon become light and variable
overnight. Winds then increase Tuesday, 5-10 kts out of the SW.
Seas generally 3-4 ft this afternoon will continue to decrease
becoming 1-3 ft overnight and continuing through at least mid
week. 

Outlook /Wednesday through Saturday/...

Wednesday: Winds less than 25 kt. 

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

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

Thursday Night through Saturday: Winds less than 25 kt. Seas up
to 5 ft. 

&&

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

&&

$$

DISCUSSION...Belk/BW/KP
AVIATION...Belk/BW/KP
MARINE...Belk/BW/KP