Lexington Weather

Current Conditions [‒] Current Conditions [+]

69.1°F Colder than last hour.

20.6°C

Muggy

Overcast

Overnight: Lo 65 °F

Wednesday: Hi 86 °F

Dew Point: 67.3°F Decreased 0.3°F since last hour.

Humidity: 94%

Air Quality Index: 34

Good

(Fine Particles)

Barometer: 29.81 in S

1009 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Tuesday: 0.00 in

Visibility: 8 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 0 mph

OTHER PERSONAL WEATHER STATIONS

REGIONAL CONDITIONS

NWS Weather Forecast -
Overnight, Wednesday, & Wednesday Night through Tuesday

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Wed Aug 19, 2026 2:58am EDT

Overview:

- Dry today through tonight.

- Unsettled weather returning Thursday with a front passing through, followed by a brief tranquil period Friday.

- Another round of unsettled weather possible for the weekend.

Overnight:

Patchy Fog

Lo 65 °F

Patchy fog. Mostly cloudy, with a low around 65. West wind around 3 mph.

Wednesday:

Patchy Fog then Mostly Sunny

Hi 86 °F

Patchy fog before 8am. Mostly sunny, with a high near 86. West wind 2 to 8 mph.

Wednesday Night:

Mostly Clear

Lo 66 °F

Mostly clear, with a low around 66. West wind 3 to 8 mph.

Thursday:

Chance Rain Showers

Hi 84 °F

A chance of rain showers after 10am. Partly sunny, with a high near 84. West wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.

Thursday Night:

Slight Chance Rain Showers then Mostly Cloudy

Lo 62 °F

A slight chance of rain showers before 10pm. Mostly cloudy, with a low around 62. Northwest wind around 5 mph. Chance of precipitation is 20%.

Friday:

Mostly Sunny

Hi 81 °F

Mostly sunny, with a high near 81. Northeast wind around 7 mph.

Friday Night:

Partly Cloudy

Lo 60 °F

Partly cloudy, with a low around 60. Southeast wind 1 to 6 mph.

Saturday:

Chance Rain Showers

Hi 77 °F

A chance of rain showers after 8am. Partly sunny, with a high near 77. East wind 3 to 9 mph. Chance of precipitation is 40%.

Saturday Night:

Chance Rain Showers

Lo 61 °F

A chance of rain showers. Mostly cloudy, with a low around 61. East wind 3 to 7 mph. Chance of precipitation is 40%.

Sunday:

Chance Rain Showers

Hi 79 °F

A chance of rain showers. Mostly cloudy, with a high near 79. Southeast wind 3 to 7 mph. Chance of precipitation is 40%.

Sunday Night:

Chance Rain Showers

Lo 61 °F

A chance of rain showers before 3am. Mostly cloudy, with a low around 61. Southwest wind around 5 mph. Chance of precipitation is 40%.

Monday:

Mostly Sunny

Hi 82 °F

Mostly sunny, with a high near 82. West wind 5 to 9 mph.

Monday Night:

Mostly Clear

Lo 59 °F

Mostly clear, with a low around 59. West wind around 7 mph.

Tuesday:

Sunny

Hi 81 °F

Sunny, with a high near 81. West wind 5 to 8 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 6am through Thu 5pm

Issued by:
National Weather Service Boston / Norton, MA
Updated Wed Aug 19, 2026 2:58am EDT

6:00am

Patchy Fog

65°F
Dew Pt 64°F
Wind from W

W 3 mph
Precip: 0%

7:00am

Patchy Fog

65°F
Dew Pt 64°F
Wind from W

W 2 mph
Precip: 0%

8:00am

Partly Sunny

68°F
Dew Pt 66°F
Wind from W

W 3 mph
Precip: 0%

9:00am

Sunny

73°F
Dew Pt 66°F
Wind from W

W 2 mph
Precip: 0%

10:00am

Sunny

77°F
Dew Pt 66°F
Wind from SW

SW 3 mph
Precip: 0%

11:00am

Sunny

80°F
Dew Pt 65°F
Heat Index: 82°F
Wind from SW

SW 5 mph
Precip: 0%

12:00pm

Sunny

82°F
Dew Pt 64°F
Heat Index: 83°F
Wind from SW

SW 7 mph
Precip: 0%

1:00pm

Sunny

83°F
Dew Pt 63°F
Heat Index: 84°F
Wind from SW

SW 7 mph
Precip: 0%

2:00pm

Sunny

84°F
Dew Pt 62°F
Heat Index: 85°F
Wind from SW

SW 8 mph
Precip: 0%

3:00pm

Sunny

85°F
Dew Pt 62°F
Heat Index: 86°F
Wind from W

W 8 mph
Precip: 1%

4:00pm

Sunny

85°F
Dew Pt 62°F
Heat Index: 86°F
Wind from W

W 8 mph
Precip: 1%

5:00pm

Sunny

85°F
Dew Pt 61°F
Wind from W

W 8 mph
Precip: 2%

6:00pm

Mostly Clear

84°F
Dew Pt 62°F
Heat Index: 85°F
Wind from W

W 8 mph
Precip: 2%

7:00pm

Mostly Clear

81°F
Dew Pt 62°F
Heat Index: 82°F
Wind from W

W 6 mph
Precip: 2%

8:00pm

Mostly Clear

79°F
Dew Pt 62°F
Wind from W

W 3 mph
Precip: 2%

9:00pm

Mostly Clear

75°F
Dew Pt 62°F
Wind from SW

SW 3 mph
Precip: 1%

10:00pm

Mostly Clear

73°F
Dew Pt 62°F
Wind from SW

SW 3 mph
Precip: 1%

11:00pm

Mostly Clear

72°F
Dew Pt 62°F
Wind from SW

SW 3 mph
Precip: 1%

Thu
12:00am

Mostly Clear

70°F
Dew Pt 63°F
Wind from SW

SW 5 mph
Precip: 1%

Thu
1:00am

Partly Cloudy

69°F
Dew Pt 63°F
Wind from SW

SW 3 mph
Precip: 1%

Thu
2:00am

Partly Cloudy

69°F
Dew Pt 63°F
Wind from SW

SW 3 mph
Precip: 1%

Thu
3:00am

Partly Cloudy

68°F
Dew Pt 63°F
Wind from SW

SW 3 mph
Precip: 1%

Thu
4:00am

Partly Cloudy

67°F
Dew Pt 62°F
Wind from W

W 3 mph
Precip: 1%

Thu
5:00am

Partly Cloudy

67°F
Dew Pt 62°F
Wind from W

W 3 mph
Precip: 1%

Thu
6:00am

Mostly Sunny

66°F
Dew Pt 62°F
Wind from W

W 3 mph
Precip: 0%

Thu
7:00am

Mostly Sunny

68°F
Dew Pt 63°F
Wind from NW

NW 3 mph
Precip: 1%

Thu
8:00am

Mostly Sunny

70°F
Dew Pt 64°F
Wind from NW

NW 3 mph
Precip: 1%

Thu
9:00am

Mostly Sunny

73°F
Dew Pt 64°F
Wind from NW

NW 5 mph
Precip: 9%

Thu
10:00am

Slight Chance Rain Showers

77°F
Dew Pt 64°F
Wind from NW

NW 5 mph
Precip: 17%

Thu
11:00am

Chance Rain Showers

80°F
Dew Pt 63°F
Heat Index: 81°F
Wind from NW

NW 5 mph
Precip: 25%

Thu
12:00pm

Chance Rain Showers

81°F
Dew Pt 63°F
Heat Index: 82°F
Wind from NW

NW 5 mph
Precip: 30%

Thu
1:00pm

Chance Rain Showers

82°F
Dew Pt 62°F
Heat Index: 83°F
Wind from W

W 6 mph
Precip: 35%

Thu
2:00pm

Chance Rain Showers

82°F
Dew Pt 61°F
Heat Index: 83°F
Wind from W

W 6 mph
Precip: 40%
Rain: 0.01 in

Thu
3:00pm

Chance Rain Showers

82°F
Dew Pt 61°F
Heat Index: 83°F
Wind from W

W 6 mph
Precip: 33%
Rain: 0.01 in

Thu
4:00pm

Chance Rain Showers

83°F
Dew Pt 62°F
Heat Index: 84°F
Wind from W

W 5 mph
Precip: 26%

Thu
5:00pm

Slight Chance Rain Showers

81°F
Dew Pt 62°F
Heat Index: 82°F
Wind from SW

SW 5 mph
Precip: 22%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 190744
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
344 AM EDT Wed Aug 19 2026

.WHAT HAS CHANGED...
No significant changes.

&&

.KEY MESSAGES...

- Dry today through tonight.

- Unsettled weather returning Thursday with a front passing 
  through, followed by a brief tranquil period Friday.

- Another round of unsettled weather possible for the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...Dry today through tonight.

With the low earlier this week now off the coast of Nova Scotia, 
high pressure has been able to build in over southern New England in 
its place. Notably aloft, a trough well to our north and west in 
Canada continues shifting eastward over the southern portion of the 
Hudson Bay. With where we are in context of this trough, strong SW-
ly flow aloft develops today through the column. Diurnal mixing 
should also aid in mixing down this SW flow, which may inhibit sea 
breeze development despite the presence of high pressure centered 
just off to our east. Any early morning fog and lower clouds will 
diminish shortly after sunrise. 925 mb temperatures will likely 
remain in the 20-23C range for the afternoon, encouraging highs into 
the mid to upper 80s.

KEY MESSAGE 2...Unsettled weather returning Thursday with a front 
passing through, followed by a brief tranquil period Friday.

A shortwave within this slightly SW flow makes its way towards 
southern New England heading into tomorrow, bringing with it more 
favorable dynamics and moisture for showers as the jet aloft also 
becomes more SW and cyclonic. With better ascent and forcing, will 
need to keep an eye on where the best moisture tracks. The 
differences between the CAMs and the global guidance remain quite 
significant, with the NAM showing greater moisture through the 
column across the whole region, while the Canadian, ECMWF, and GFS 
all indicate layers of dry air in the lower to mid levels that would 
greatly affect precipitation. Given the signal for dry air limiting 
rainfall, I kept the chances for precipitation to around 30% or less 
and total QPF to up to 0.15". This is in line with what most of the 
ensemble guidance is indicating as well, as the greater 
concentration of moisture is shown in this guidance to remain just 
to our southwest.

Following the passage of this front, much drier air files in behind 
it. Dew points are expected to drop into the 50s across the region 
and remain generally in the upper 50s and low 60s Thursday night 
into Friday. High pressure makes its return Friday as a brief 
respite from this unsettled pattern, with onshore breezes and highs 
in the low 80s and upper 70s, with mid 70s along the immediate 
coastal areas.

KEY MESSAGE 3...Another round of unsettled weather possible for the 
weekend.

A much larger shortwave moves in from the Great Lakes Saturday into 
Sunday, greatly amplifying the SW flow aloft. Guidance signals at 
the possibility of a series of waves tracking NE along within this 
SW flow, and a surface low may pass along the east coast up into 
southern New England. Track is still somewhat uncertain, but this 
would likely bring the return of showers. Depending on the timing of 
these waves and low pressure, thunderstorms could be possible if 
they can take advantage of daytime heat.

Heading into the start of next week, it's also worth noting that the 
troughing associated with the leading shortwave cutting south 
through the Great Lakes could end up more as a closed off low aloft. 
Deterministic guidance keys in more on this possibility, but the 
Canadian ensemble notes the possibility along with the ECMWF 
ensemble hinting at it slightly; the GEFS keeps it a bit more open 
as of the 00z run. We may find ourselves in the low's post-frontal 
airmass for Monday with more W-ly flow keeping the region slightly 
cooler; 850 mb temps may fall to near 10C. Will be something to 
continue monitoring in future updates.

&&

.AVIATION /07Z WEDNESDAY THROUGH SUNDAY/...
Forecaster Confidence Levels...

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

06z TAF Update

Through 12z...Moderate confidence.

MVFR for most with some areas of IFR. Some patchy fog remains
possible between 08z-11z. Light to calm winds through the rest
of tonight before more SW winds pick up after sunrise.

Today...High confidence.

MVFR to start, becoming VFR within a few hours after sunrise. SW
winds between 5-10 kt, with gusts to just under 20 kt a
possibility for the Cape and Island terminals. Seabreezes not
expected given the strength of SW flow and forecast soundings
indicating good diurnal mixing, though some models do continue
to hint at it for BOS.

Tonight...High confidence.

VFR, with the exception of possibly the Cape and Islands, far 
SE MA, and coastal RI. Winds remaining light SW below 10 kt with
calm winds possible over the interior.

Thursday...Moderate confidence.

VFR with chances for SHRA. TSRA not expected. 

KBOS Terminal...Moderate confidence in TAF. Low chance for a
seabreeze in the 16-21z timeframe. Only a few models indicate it
and keep it short-lived, so opted to hint at it with a S wind at
17z. Would not be surprised if this does not happen though,
given the strong SW flow over the region.

KBDL Terminal...High confidence in TAF.

Outlook /Thursday Night through Sunday/...

Thursday Night: VFR. Slight chance SHRA.

Friday: VFR. 

Friday Night: VFR. Slight chance SHRA.

Saturday: VFR. Chance SHRA.

Saturday Night: Mainly VFR, with local IFR possible. Chance
SHRA.

Sunday: VFR. 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 Thursday...High confidence.

Light winds generally from the SW, though gusts nearing 20 kt
are possible for this afternoon in the eastern waters. Showers
possible over the waters Thursday into Thursday night. Patchy
fog also a possible tonight, particularly for the southern
waters. Seas to 2-3 ft.

Outlook /Thursday Night through Sunday/...

Thursday Night: Winds less than 25 kt. Slight chance of rain
showers. 

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

Saturday: Winds less than 25 kt. Chance of rain showers, slight
chance of thunderstorms. 

Saturday Night: Winds less than 25 kt. Rain showers likely,
slight chance of thunderstorms. 

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

&&

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

&&

$$

DISCUSSION...Hrencecin
AVIATION...Hrencecin
MARINE...Hrencecin

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