Lexington Weather

Lexington, Massachusetts, USA

67°F

7/31/2021 8:27pm

Lexington Conditions: Clear
Temperature: 66.7°F / 19.3°C
Dew Point: 54.7°F
Relative Humidity: 65%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.87 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

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Current Conditions [‒] Current Conditions [+]

66.7°F Colder than last hour.

19.3°C

Comfortable

Clear

Tonight: Lo 56 °F

Sunday: Hi 80 °F

Dew Point: 54.7°F Decreased 1.2°F since last hour.

Humidity: 65%

Barometer: 29.87 in S

1012 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Friday: 0.13 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 0 mph

OTHER PERSONAL WEATHER STATIONS

REGIONAL CONDITIONS

NWS Weather Forecast -
Tonight, Sunday, & Sunday Night through Saturday

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sat Jul 31, 2021 7:22pm EDT

Overview:

High pressure shifts offshore tonight. A round of showers will likely cross the region Sunday night followed by mainly dry weather for the first half of the upcoming work week. Unsettled weather looks to return by the second half the week.

Tonight:

Partly Cloudy

Lo 56 °F

Partly cloudy, with a low around 56. West wind 1 to 7 mph.

Sunday:

Mostly Sunny

Hi 80 °F

Mostly sunny, with a high near 80. Southwest wind 1 to 10 mph.

Sunday Night:

Chance Rain Showers

Lo 60 °F

A chance of rain showers before midnight, then a chance of rain showers and patchy fog. Mostly cloudy, with a low around 60. Southwest wind 3 to 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.

Monday:

Chance Rain Showers

Hi 78 °F

A chance of rain showers. Mostly sunny, with a high near 78. Northwest wind 5 to 9 mph. Chance of precipitation is 50%.

Monday Night:

Partly Cloudy

Lo 58 °F

Partly cloudy, with a low around 58. Northwest wind 2 to 6 mph.

Tuesday:

Partly Sunny

Hi 77 °F

Partly sunny, with a high near 77. Southwest wind around 5 mph.

Tuesday Night:

Slight Chance Rain Showers then Mostly Cloudy

Lo 60 °F

A slight chance of rain showers before 11pm. Mostly cloudy, with a low around 60. Southwest wind around 5 mph.

Wednesday:

Slight Chance Rain Showers

Hi 79 °F

A slight chance of rain showers after 7am. Partly sunny, with a high near 79. South wind 2 to 6 mph.

Wednesday Night:

Chance Rain Showers

Lo 61 °F

A chance of rain showers. Mostly cloudy, with a low around 61. East wind around 5 mph. Chance of precipitation is 30%.

Thursday:

Chance Rain Showers

Hi 78 °F

A chance of rain showers. Partly sunny, with a high near 78. East wind around 6 mph. Chance of precipitation is 40%.

Thursday Night:

Chance Rain Showers

Lo 63 °F

A chance of rain showers. Mostly cloudy, with a low around 63. Southeast wind around 5 mph. Chance of precipitation is 40%.

Friday:

Chance Rain Showers

Hi 77 °F

A chance of rain showers. Partly sunny, with a high near 77. South wind 3 to 7 mph. Chance of precipitation is 30%.

Friday Night:

Chance Rain Showers

Lo 65 °F

A chance of rain showers. Mostly cloudy, with a low around 65. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.

Saturday:

Chance Rain Showers

Hi 82 °F

A chance of rain showers. Partly sunny, with a high near 82. Southwest wind around 6 mph. Chance of precipitation is 30%.

FULL FORECAST

NWS Hourly Forecast -
Tonight 8pm through Sun 11am

Issued by:
National Weather Service Boston / Norton, MA
Updated Sat Jul 31, 2021 7:30pm EDT

8:00pm

Partly Cloudy

67°F
Dew Pt 52°F
Wind from W

W 6 mph
Precip: 0%

9:00pm

Partly Cloudy

65°F
Dew Pt 53°F
Wind from W

W 5 mph
Precip: 0%

10:00pm

Partly Cloudy

63°F
Dew Pt 53°F
Wind from W

W 3 mph
Precip: 0%

11:00pm

Partly Cloudy

62°F
Dew Pt 53°F
Wind from W

W 1 mph
Precip: 0%

Sun
12:00am

Partly Cloudy

60°F
Dew Pt 53°F
Wind from W

W 1 mph
Precip: 0%

Sun
1:00am

Partly Cloudy

59°F
Dew Pt 51°F
Wind from W

W 1 mph
Precip: 0%

Sun
2:00am

Mostly Clear

58°F
Dew Pt 50°F
Wind from W

W 1 mph
Precip: 0%

Sun
3:00am

Mostly Clear

57°F
Dew Pt 50°F
Wind from W

W 1 mph
Precip: 0%

Sun
4:00am

Mostly Clear

56°F
Dew Pt 51°F
Wind from W

W 1 mph
Precip: 0%

Sun
5:00am

Mostly Clear

56°F
Dew Pt 51°F
Wind from W

W 1 mph
Precip: 0%

Sun
6:00am

Sunny

56°F
Dew Pt 51°F
Wind from W

W 1 mph
Precip: 0%

Sun
7:00am

Sunny

57°F
Dew Pt 51°F
Wind from W

W 2 mph
Precip: 0%

Sun
8:00am

Sunny

60°F
Dew Pt 52°F
Wind from W

W 2 mph
Precip: 0%

Sun
9:00am

Sunny

65°F
Dew Pt 53°F
Wind from SW

SW 3 mph
Precip: 0%

Sun
10:00am

Sunny

69°F
Dew Pt 53°F
Wind from S

S 3 mph
Precip: 2%

Sun
11:00am

Sunny

72°F
Dew Pt 53°F
Wind from S

S 5 mph
Precip: 4%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 311957
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
Issued by National Weather Service New York NY
357 PM EDT Sat Jul 31 2021

.SYNOPSIS...
High pressure shifts offshore tonight. A round of showers will 
likely cross the region Sunday night followed by mainly dry 
weather for the first half of the upcoming work week. Unsettled 
weather looks to return by the second half the week.

&&

.NEAR TERM /THROUGH 6 AM SUNDAY/... 
A ridge of high pressure will slide to the south of our region 
tonight. The result will be mainly clear skies, light winds and 
cool temperatures. It probably will be a couple of degrees 
milder than early this morning. Nonetheless, low temps should 
still bottom out in near 50 in the coolest outlying locations 
and the middle 50s to near 60 elsewhere.

&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/...

* Sunday will feature partly sunny skies with mainly dry weather

A shortwave dropping southeastward from the Great Lakes will 
result in southwest flow aloft developing. This warm section 
pattern should allow for an increase in mid level cloudiness as 
the day wears along; but still expect partial sunshine. The 
deeper moisture/forcing will remain to our northwest; so expect 
the vast majority of the day to remain dry. We can not rule out 
a few showers late in the day across the interior, but overall a
dry and very pleasant day of weather is on tap. The warm 
advection pattern should allow for highs to reach the upper 70s 
to around 80 in most locations. Dewpoints will be higher than 
today, but humidity will remain in check for this time of year.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...
Highlights...

* No big warm ups in sight and the return of humidity. 
* Generally fair weather through mid week but turning unsettled late 
  week, where there is increased potential for heavy rainfall and 
  possible flooding concerns given antecedent conditions.  

Details...

We are currently under a positive PNA and neutral NAO regime. This 
means a highly amplified ridge over Western US (the Pacific 
Northwest are about to have the season's second major heat wave). 
But because there is a lack of blocking downstream, H5 troughs are 
either positively tilted or at best neutral which means surges of 
cooler/drier air and/or storm systems would be relatively transient 
or progressive. Putting things together, the CPC's 6-10 and 8-14 day 
outlooks of near normal temperatures and near normal precipitation 
make a lot of sense. 

Then by middle of next week, the PNA is forecast to go neutral and 
the jet stream flattens out, allowing for the Bermuda High to exert 
a greater influence and higher heights to build back into the 
Eastern seaboard. Yet warm weather fans should not rejoice 
prematurely. Troughing persists over the eastern United States with 
an upper level low expected to develop over the Ohio/Tennessee 
Valleys by mid-week even as the ridge over the western Atlantic 
strengthens and builds westward toward the east coast. This would 
result in a predominantly meridional flow for Southern New England. 
In fact, meteograms from ensemble guidance suggest that most days 
would feature rather seasonable temperatures (upper 70s to low 80s) 
with no strong signal for big warmups until perhaps late next week 
at the earliest. Of course, if we were able to get a more zonal 
component on one of these days, we could pop into the mid to upper 
80s but it is nearly impossible to determine which day could feature 
summer heat. 

In addition, with the meridional flow comes tropical moisture (with 
PWATs rising to 2 inches or maximum of sounding climatology!) and 
the risk for moderate to heavy rainfall along the axis of 
convergence, especially towards late week. And with antecedent 
conditions, there is increased potential for flooding where the 
stalled boundary sets up but it is too premature to pin down any 
more geographic details.

&&

.AVIATION /21Z SATURDAY THROUGH WEDNESDAY/... 

Forecaster Confidence Levels.

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

21Z Update...

Tonight...High Confidence. VFR with light/calm winds.

Sunday...High Confidence. VFR despite an increase in mid level 
cloudiness. Perhaps a few showers across the interior by late in the 
day, but appears main threat of precipitation will hold off until 
nightfall. S to SE winds of 5-10 knots.

KBOS Terminal...High Confidence in TAF.

KBDL Terminal...High Confidence in TAF.

Outlook /Monday through Wednesday/...

Sunday Night: Mainly MVFR, with areas VFR possible. Breezy.
Chance SHRA.

Monday: Mainly VFR, with areas MVFR possible. Slight chance SHRA.

Monday Night: VFR. 

Tuesday through Tuesday Night: Mainly VFR, with local MVFR possible. 
Slight chance SHRA.

Wednesday: Mainly VFR, with areas MVFR possible. Slight chance
SHRA.

&&

.MARINE...
Forecaster Confidence Levels.

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

Tonight through Sunday...High Confidence. High pressure sliding
to our south tonight and Sunday will keep winds/seas below 
small craft advisory thresholds through Sunday. As this high 
passes to our south the winds will shift to the SSE at 10 to 15 
knots with a few gusts near 20 knots on Sunday; but below small 
craft advisory criteria.

/Outlook /Sunday Night through Wednesday Night/...

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

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

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

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

Wednesday through Wednesday Night: Winds less than 25 kt. Areas
of seas approaching 5 ft. Chance of rain showers.

Thursday: 

&&

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

&&

$$