Lexington Weather

Current Conditions [‒] Current Conditions [+]

63.9°F Colder than last hour.

17.7°C

Comfortable

Clear

Tonight: Lo 59 °F

Sunday: Hi 82 °F

Dew Point: 50.5°F Increased 0.1°F since last hour .

Humidity: 62% Increased 3.0% since last hour.

Air Quality Index: 49

Good

(Ozone)

Barometer: 29.80 in Falling 0.02 inHg/hr

1009 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Friday: 0.02 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 2 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 May 16, 2026 9:56pm EDT

Overview:

- Streak of well above normal temperatures Sunday through Wednesday. There is an increasing chance for record warm temperatures Tuesday and Wednesday. Isolated thunderstorms are possible Tuesday, some of which may be strong.

- Unseasonably warm Wednesday with scattered thunderstorms possible later in the day with some potentially strong to severe.

- Cooler, more seasonable temperatures late week.

Tonight:

Partly Cloudy then Slight Chance Rain Showers

Lo 59 °F

A slight chance of rain showers between 2am and 5am. Partly cloudy, with a low around 59. Southwest wind around 10 mph. Chance of precipitation is 20%.

Sunday:

Sunny

Hi 82 °F

Sunny, with a high near 82. West wind 7 to 12 mph, with gusts as high as 22 mph.

Sunday Night:

Mostly Clear

Lo 54 °F

Mostly clear, with a low around 54. North wind 2 to 9 mph.

Monday:

Mostly Sunny

Hi 74 °F

Mostly sunny, with a high near 74. Southeast wind 2 to 9 mph.

Monday Night:

Mostly Clear

Lo 59 °F

Mostly clear, with a low around 59. South wind around 9 mph.

Tuesday:

Sunny

Hi 91 °F

Sunny, with a high near 91. Southwest wind 7 to 12 mph.

Tuesday Night:

Mostly Clear

Lo 69 °F

Mostly clear, with a low around 69. Southwest wind 7 to 10 mph.

Wednesday:

Mostly Sunny then Showers And T-Storms Likely

Hi 92 °F

Wednesday: Mostly Sunny then Showers And Thunderstorms Likely

A chance of rain showers between noon and 2pm, then showers and thunderstorms likely. Mostly sunny, with a high near 92. Southwest wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

Wednesday Night:

Showers And T-Storms Likely

Lo 57 °F

Wednesday Night: Showers And Thunderstorms Likely

Showers and thunderstorms likely. Mostly cloudy, with a low around 57. West wind 7 to 10 mph. Chance of precipitation is 60%.

Thursday:

Slight Chance Rain Showers then Partly Sunny

Hi 70 °F

A slight chance of rain showers before 10am. Partly sunny, with a high near 70. Northwest wind around 8 mph.

Thursday Night:

Mostly Cloudy

Lo 49 °F

Mostly cloudy, with a low around 49. North wind 3 to 7 mph.

Friday:

Partly Sunny

Hi 67 °F

Partly sunny, with a high near 67. Northeast wind 3 to 7 mph.

Friday Night:

Mostly Cloudy

Lo 49 °F

Mostly cloudy, with a low around 49. Southeast wind 2 to 7 mph.

Saturday:

Slight Chance Rain Showers

Hi 67 °F

A slight chance of rain showers after 8am. Partly sunny, with a high near 67. Northeast wind 2 to 7 mph.

FULL FORECAST

NWS Hourly Forecast -
Tonight 11pm through Mon 10am

Issued by:
National Weather Service Boston / Norton, MA
Updated Sat May 16, 2026 9:56pm EDT

11:00pm

Mostly Clear

61°F
Dew Pt 47°F
Wind from SW

SW 10 mph
Precip: 6%

Sun
12:00am

Partly Cloudy

61°F
Dew Pt 47°F
Wind from SW

SW 10 mph
Precip: 2%

Sun
1:00am

Mostly Cloudy

61°F
Dew Pt 48°F
Wind from SW

SW 10 mph
Precip: 4%

Sun
2:00am

Slight Chance Rain Showers

61°F
Dew Pt 48°F
Wind from SW

SW 9 mph
Precip: 15%

Sun
3:00am

Mostly Cloudy

61°F
Dew Pt 49°F
Wind from SW

SW 9 mph
Precip: 7%

Sun
4:00am

Slight Chance Rain Showers

61°F
Dew Pt 50°F
Wind from SW

SW 9 mph
Precip: 22%

Sun
5:00am

Partly Cloudy

61°F
Dew Pt 51°F
Wind from SW

SW 8 mph
Precip: 1%

Sun
6:00am

Sunny

61°F
Dew Pt 52°F
Wind from SW

SW 8 mph
Precip: 1%

Sun
7:00am

Sunny

62°F
Dew Pt 52°F
Wind from W

W 7 mph
Precip: 0%

Sun
8:00am

Sunny

65°F
Dew Pt 54°F
Wind from W

W 7 mph
Precip: 0%

Sun
9:00am

Sunny

68°F
Dew Pt 54°F
Wind from W

W 7 mph
Precip: 0%

Sun
10:00am

Sunny

71°F
Dew Pt 54°F
Wind from W

W 8 mph
Precip: 0%

Sun
11:00am

Sunny

74°F
Dew Pt 53°F
Wind from W

W 9 mph
Precip: 0%

Sun
12:00pm

Sunny

76°F
Dew Pt 52°F
Wind from W

W 9 mph
Precip: 0%

Sun
1:00pm

Sunny

79°F
Dew Pt 51°F
Wind from W

W 10 mph
Precip: 0%

Sun
2:00pm

Sunny

80°F
Dew Pt 51°F
Wind from W

W 12 mph
Precip: 0%

Sun
3:00pm

Mostly Sunny

80°F
Dew Pt 50°F
Wind from W

W 12 mph
Precip: 0%

Sun
4:00pm

Sunny

80°F
Dew Pt 49°F
Wind from W

W 12 mph
Precip: 0%

Sun
5:00pm

Sunny

80°F
Dew Pt 49°F
Wind from W

W 10 mph
Precip: 0%

Sun
6:00pm

Mostly Clear

78°F
Dew Pt 50°F
Wind from W

W 9 mph
Precip: 1%

Sun
7:00pm

Mostly Clear

75°F
Dew Pt 51°F
Wind from NW

NW 7 mph
Precip: 0%

Sun
8:00pm

Clear

72°F
Dew Pt 51°F
Wind from NW

NW 6 mph
Precip: 0%

Sun
9:00pm

Mostly Clear

68°F
Dew Pt 51°F
Wind from W

W 5 mph
Precip: 0%

Sun
10:00pm

Mostly Clear

65°F
Dew Pt 50°F
Wind from NW

NW 5 mph
Precip: 0%

Sun
11:00pm

Mostly Clear

63°F
Dew Pt 49°F
Wind from N

N 5 mph
Precip: 0%

Mon
12:00am

Mostly Clear

61°F
Dew Pt 48°F
Wind from N

N 3 mph
Precip: 0%

Mon
1:00am

Partly Cloudy

61°F
Dew Pt 48°F
Wind from N

N 3 mph
Precip: 0%

Mon
2:00am

Partly Cloudy

59°F
Dew Pt 47°F
Wind from N

N 3 mph
Precip: 0%

Mon
3:00am

Mostly Clear

57°F
Dew Pt 46°F
Wind from NE

NE 3 mph
Precip: 0%

Mon
4:00am

Mostly Clear

56°F
Dew Pt 46°F
Wind from NE

NE 2 mph
Precip: 0%

Mon
5:00am

Mostly Clear

55°F
Dew Pt 45°F
Wind from E

E 2 mph
Precip: 0%

Mon
6:00am

Sunny

55°F
Dew Pt 45°F
Wind from E

E 3 mph
Precip: 0%

Mon
7:00am

Sunny

57°F
Dew Pt 45°F
Wind from E

E 2 mph
Precip: 0%

Mon
8:00am

Mostly Sunny

58°F
Dew Pt 45°F
Wind from E

E 3 mph
Precip: 0%

Mon
9:00am

Sunny

61°F
Dew Pt 44°F
Wind from E

E 5 mph
Precip: 0%

Mon
10:00am

Mostly Sunny

63°F
Dew Pt 44°F
Wind from SE

SE 6 mph
Precip: 0%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 162340
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
740 PM EDT Sat May 16 2026

.WHAT HAS CHANGED...
Only change was to increase probability of precipitation
overnight with some isolated showers.

&&

.KEY MESSAGES...

- Streak of well above normal temperatures Sunday through 
  Wednesday. There is an increasing chance for record warm 
  temperatures Tuesday and Wednesday. Isolated thunderstorms are
  possible Tuesday, some of which may be strong. 

- Unseasonably warm Wednesday with scattered thunderstorms
  possible later in the day with some potentially strong to 
  severe. 

- Cooler, more seasonable temperatures late week.

&&

.DISCUSSION...
KEY MESSAGE 1...Streak of well above normal temperatures Sunday 
through Wednesday. There is an increasing chance for record warm 
temperatures Tuesday and Wednesday. Isolated thunderstorms are 
possible Tuesday some of which may be strong. 

Mainly dry and warmer for the rest of the day with high pressure 
largely in control of the weather pattern. A few widely scattered 
showers are possible overnight as a weakening batch of convection 
makes its way through the region. Best chance will be across 
portions of northern and central Massachusetts where forcing will be 
a bit more concentrated. 

High confidence continues in a pattern change to unseasonable warm 
temperatures for the first half of next week and potentially 
flirting with record highs on Tue/Wed. Strong Bermuda ridge pushes 
500mb heights to 588-590 dm. GEFS/EPS ensembles show a 60-80 percent 
chance of high temps of at least 90 across the CWA. This is a strong 
signal considering we are still several days away from this event! 

More significant warm up begins Sunday as southwest flow helps warm 
temps into the middle 80s for much of the interior. Elsewhere, water 
temps in the 50s will help keep temperatures about 10 to 15 degrees 
cooler. High pressure to the N of the region shifts winds to the NE 
on Monday resulting in slightly cooler temperatures, especially near 
the coast. Highs Mon on the immediate coast probably in the upper 
60s and 70s while 80+ risk will be confined to the interior. The 
hottest days look to be Tue and/or Wed depending on the timing of a 
cold front. 925T near +24C should result in the potential for high 
temperatures to climb into the 90s away from any modified marine 
influences. This may result in record high temperatures being 
challenged at least in areas away from the south coast. Main factor 
acting against realizing the widespread mid 90s advertised by the 
NBM will be cloud cover extent. Should be a somewhat drier heat with 
dewpoints in the lower 50s Tuesday. 

Finally, guidance continues to show a chance for isolated strong to 
sever thunderstorms Tuesday afternoon. There should be plenty of 
instability for storms with the NBM showing a widespread 40-60% 
chance of values exceeding 1000 J/kg Tuesday afternoon. The limiting 
factor at this time is the lack of wind shear and forcing as a front 
remains well to the west. Thus, at this time, the coverage of storms 
remains in question. 


KEY MESSAGE 2...Unseasonably warm Wednesday with scattered 
thunderstorms possible later in the day with some potentially strong 
to severe.

A low pressure system and attendant cold front is expected to track 
across the northeast Wednesday into Thursday. Depending on the 
timing of the cold front, we may see one last day of above normal 
high temperatures in southern New England. This is supported by warm 
925mb temperatures bumping up to 23-25C with enhancement from the 
WAA ahead of the approaching system. There is high confidence for 
temperatures 80F+ with ensembles indicating potential for highs 
around 90 in the valleys inland. South coast and Cape and Islands 
will stay in the 70s and low 80s from the southwesterly onshore 
flow. Another early season hot day, so be sure to hydrate, take 
breaks, and have a cool place to do so. 

Ahead of the cold front, southwesterly flow aloft helps to advect in 
Gulf moisture as instability builds ahead of the frontal system with 
the ample heating. MLCAPE values appear on the marginal side, 
although shear appear sufficient with the help of a jet. With the 
added forcing of the front, this should support scattered 
thunderstorms developing later in the day with potential for some 
storms being strong to severe. Forecast soundings indicate a good 
amount of dry air at the surface which may be a signal for strong 
downdrafts (gusty winds) within any strong-severe storms. The 
assorted ML guidance shows a signal with low probabilities for 
severe at this time. We are still a ways out and details on the 
timing of the front will need to be ironed out more before 
confidence increases in the severe potential. Stay tuned. 

KEY MESSAGE 3...Cooler, more seasonable temperatures late week.

A cold front will swing through by Thursday bringing in a cooler 
airmass. This will bring in more seasonable/seasonably cool 
temperatures late-week with mainly dry conditions and northerly 
component flow.

&&

.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...

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

00Z TAF Update:

Tonight...High Confidence

VFR conditions. Period of midlevel ceilings overnight with a low
chance for an isolated shower. SW winds 5-10 kts in 
west/central MA and 9-14 kts for east terminals. Winds shift 
more WSW toward 12Z. Areas of LLWS overnight from BOS points SE.

Sunday & Sunday Night...High confidence

VFR. WSW to W winds 8-13 kts with gusts around 20 kts 
developing after 15Z. Winds shift WNW later in afternoon-early
evening. Winds becoming light and briefly variable after 00Z,
becoming easterly overnight. 

KBOS...High confidence in TAF 

KBDL...High confidence in TAF.

Outlook /Sunday Night through Thursday/...

Monday: VFR. Breezy. 

Monday Night: VFR. 

Tuesday through Tuesday Night: VFR. Breezy. 

Wednesday through Wednesday Night: VFR. Breezy. Chance SHRA,
slight chance TSRA.

Thursday: VFR. Slight chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

SCAs remain in effect on most waters as easterly swell that
brings elevated seas in the 4-7 ft range tonight. Winds shift 
W tonight into Sunday. Given the continued elevated seas and 
increase in winds tomorrow, SCAs have been extended through 
Sunday afternoon. Winds and seas are expected to remain 
elevated then gradually fall as high pressure builds in.

Outlook /Sunday Night through Thursday/...

Monday through Monday Night: Winds less than 25 kt. 

Tuesday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Areas of seas approaching 5 ft. 

Tuesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Local rough seas. 

Wednesday: Moderate risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of seas approaching 5 ft. Chance of
rain showers. 

Wednesday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft. Chance of rain showers, slight chance of
thunderstorms. 

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for 
     ANZ231>234.
     Small Craft Advisory until 2 AM EDT Sunday for ANZ235-237-251.
     Small Craft Advisory until 2 PM EDT Sunday for ANZ250-254>256.

&&

$$

DISCUSSION...Mensch/RM
AVIATION...Mensch/FT
MARINE...FT

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