Lexington Weather

Current Conditions [‒] Current Conditions [+]

52.0°F Colder than last hour.

11.1°C

Cool

Few Clouds

Tonight: Lo 46 °F

Saturday: Hi 77 °F

Dew Point: 50.0°F Decreased 1.4°F since last hour.

Humidity: 93%

Air Quality Index: 28

Good

(Ozone)

Barometer: 29.92 in S

1013 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.02 in

Rain Thursday: 0.43 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 0 mph

OTHER PERSONAL WEATHER STATIONS

REGIONAL CONDITIONS

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

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Fri May 15, 2026 8:18pm EDT

Overview:

- Fog possible overnight before warm-up kicks off Saturday.

- Unseasonably warm temps Sun through Wed with near record high temps into the 90s possible Tue and/or Wed.

- Strong to severe thunderstorms possible by Tue with perhaps a better potential by Wed but a lot needs to be sorted out.

- Seasonable temperatures return by next Thu and Fri.

Tonight:

Mostly Clear then Patchy Fog

Lo 46 °F

Patchy fog after 1am. Mostly clear, with a low around 46. West wind around 3 mph.

Saturday:

Patchy Fog then Sunny

Hi 77 °F

Patchy fog before 8am. Sunny, with a high near 77. Southwest wind 5 to 14 mph.

Saturday Night:

Partly Cloudy then Scattered Rain Showers

Lo 59 °F

Scattered rain showers between midnight and 5am. Partly cloudy, with a low around 59. Southwest wind 8 to 14 mph. Chance of precipitation is 30%.

Sunday:

Sunny

Hi 84 °F

Sunny, with a high near 84. West wind 9 to 13 mph, with gusts as high as 24 mph.

Sunday Night:

Mostly Clear

Lo 54 °F

Mostly clear, with a low around 54. North wind 2 to 10 mph.

Monday:

Mostly Sunny

Hi 77 °F

Mostly sunny, with a high near 77. East wind 2 to 8 mph.

Monday Night:

Mostly Clear

Lo 58 °F

Mostly clear, with a low around 58. South wind 6 to 9 mph.

Tuesday:

Sunny

Hi 91 °F

Sunny, with a high near 91. Southwest wind 6 to 10 mph.

Tuesday Night:

Partly Cloudy

Lo 66 °F

Partly cloudy, with a low around 66. Southwest wind 6 to 9 mph.

Wednesday:

Mostly Sunny then Scattered Showers And T-Storms

Hi 88 °F

Wednesday: Mostly Sunny then Scattered Showers And Thunderstorms

Scattered showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Southwest wind 6 to 10 mph. Chance of precipitation is 50%.

Wednesday Night:

Scattered Showers And T-Storms

Lo 57 °F

Wednesday Night: Scattered Showers And Thunderstorms

Scattered showers and thunderstorms before 2am. Mostly cloudy, with a low around 57. West wind around 8 mph. Chance of precipitation is 40%.

Thursday:

Slight Chance Rain Showers

Hi 69 °F

A slight chance of rain showers between 8am and 2pm. Mostly sunny, with a high near 69. Northwest wind around 7 mph.

Thursday Night:

Partly Cloudy

Lo 50 °F

Partly cloudy, with a low around 50. Northwest wind 2 to 6 mph.

Friday:

Mostly Sunny

Hi 68 °F

Mostly sunny, with a high near 68. Northwest wind 1 to 6 mph.

FULL FORECAST

NWS Hourly Forecast -
Tonight 8pm through Sun 7am

Issued by:
National Weather Service Boston / Norton, MA
Updated Fri May 15, 2026 8:18pm EDT

8:00pm

Mostly Cloudy

51°F
Dew Pt 49°F
Wind from NW

NW 3 mph
Precip: 0%

9:00pm

Partly Cloudy

51°F
Dew Pt 48°F
Wind from NW

NW 3 mph
Precip: 0%

10:00pm

Mostly Clear

50°F
Dew Pt 47°F
Wind Chill: 49°F
Wind from NW

NW 3 mph
Precip: 0%

11:00pm

Mostly Clear

49°F
Dew Pt 46°F
Wind from W

W 2 mph
Precip: 0%

Sat
12:00am

Mostly Clear

48°F
Dew Pt 46°F
Wind Chill: 47°F
Wind from W

W 3 mph
Precip: 0%

Sat
1:00am

Patchy Fog

48°F
Dew Pt 46°F
Wind Chill: 47°F
Wind from W

W 3 mph
Precip: 0%

Sat
2:00am

Patchy Fog

47°F
Dew Pt 45°F
Wind Chill: 46°F
Wind from SW

SW 3 mph
Precip: 0%

Sat
3:00am

Patchy Fog

46°F
Dew Pt 44°F
Wind Chill: 45°F
Wind from SW

SW 3 mph
Precip: 0%

Sat
4:00am

Patchy Fog

46°F
Dew Pt 44°F
Wind Chill: 45°F
Wind from SW

SW 3 mph
Precip: 0%

Sat
5:00am

Patchy Fog

47°F
Dew Pt 44°F
Wind from SW

SW 2 mph
Precip: 0%

Sat
6:00am

Patchy Fog

49°F
Dew Pt 45°F
Wind Chill: 47°F
Wind from SW

SW 5 mph
Precip: 0%

Sat
7:00am

Patchy Fog

52°F
Dew Pt 48°F
Wind from SW

SW 6 mph
Precip: 0%

Sat
8:00am

Sunny

55°F
Dew Pt 50°F
Wind from SW

SW 7 mph
Precip: 0%

Sat
9:00am

Sunny

59°F
Dew Pt 50°F
Wind from SW

SW 8 mph
Precip: 0%

Sat
10:00am

Mostly Sunny

64°F
Dew Pt 49°F
Wind from SW

SW 8 mph
Precip: 0%

Sat
11:00am

Mostly Sunny

67°F
Dew Pt 49°F
Wind from SW

SW 9 mph
Precip: 0%

Sat
12:00pm

Sunny

70°F
Dew Pt 48°F
Wind from SW

SW 10 mph
Precip: 0%

Sat
1:00pm

Sunny

73°F
Dew Pt 47°F
Wind from SW

SW 12 mph
Precip: 0%

Sat
2:00pm

Sunny

75°F
Dew Pt 46°F
Wind from SW

SW 13 mph
Precip: 0%

Sat
3:00pm

Sunny

76°F
Dew Pt 47°F
Wind from SW

SW 14 mph
Precip: 0%

Sat
4:00pm

Sunny

77°F
Dew Pt 46°F
Wind from SW

SW 14 mph
Precip: 0%

Sat
5:00pm

Sunny

76°F
Dew Pt 47°F
Wind from SW

SW 14 mph
Precip: 0%

Sat
6:00pm

Mostly Clear

74°F
Dew Pt 47°F
Wind from SW

SW 14 mph
Precip: 0%

Sat
7:00pm

Mostly Clear

71°F
Dew Pt 48°F
Wind from SW

SW 13 mph
Precip: 0%

Sat
8:00pm

Mostly Clear

68°F
Dew Pt 48°F
Wind from SW

SW 12 mph
Precip: 0%

Sat
9:00pm

Partly Cloudy

64°F
Dew Pt 48°F
Wind from SW

SW 13 mph
Precip: 1%

Sat
10:00pm

Partly Cloudy

63°F
Dew Pt 48°F
Wind from SW

SW 13 mph
Precip: 3%

Sat
11:00pm

Partly Cloudy

61°F
Dew Pt 47°F
Wind from SW

SW 13 mph
Precip: 4%

Sun
12:00am

Isolated Rain Showers

61°F
Dew Pt 47°F
Wind from SW

SW 13 mph
Precip: 16%

Sun
1:00am

Scattered Rain Showers

61°F
Dew Pt 48°F
Wind from SW

SW 12 mph
Precip: 28%

Sun
2:00am

Scattered Rain Showers

61°F
Dew Pt 48°F
Wind from SW

SW 10 mph
Precip: 28%

Sun
3:00am

Scattered Rain Showers

61°F
Dew Pt 49°F
Wind from SW

SW 10 mph
Precip: 28%

Sun
4:00am

Isolated Rain Showers

61°F
Dew Pt 50°F
Wind from SW

SW 9 mph
Precip: 20%

Sun
5:00am

Partly Cloudy

61°F
Dew Pt 50°F
Wind from SW

SW 8 mph
Precip: 12%

Sun
6:00am

Mostly Sunny

61°F
Dew Pt 51°F
Wind from SW

SW 9 mph
Precip: 8%

Sun
7:00am

Mostly Sunny

62°F
Dew Pt 52°F
Wind from W

W 9 mph
Precip: 5%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 152318
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
718 PM EDT Fri May 15 2026

.WHAT HAS CHANGED...

Chances for some brief scattered showers late Saturday night 
into very early Sunday morning. Confidence increasing in near 
record high temperatures possible by Tuesday and/or Wednesday 
along with the potential for a round of strong to severe 
thunderstorms.

&&

.KEY MESSAGES...

- Fog possible overnight before warm-up kicks off Saturday.

- Unseasonably warm temps Sun through Wed with near record high
  temps into the 90s possible Tue and/or Wed.  

- Strong to severe thunderstorms possible by Tue with perhaps a
  better potential by Wed but a lot needs to be sorted out. 

- Seasonable temperatures return by next Thu and Fri.

&&

.DISCUSSION...

KEY MESSAGE 1...Fog possible overnight before warm-up kicks off
Saturday.

The closed low aloft will continue shifting offshore through 
tonight, being replaced by more zonal flow to kick off the weekend. 
The associated surface low currently located off to our east that is 
providing the moisture plume around NE MA will also progress east 
through tonight and pull away from the region. Latest mesoanalysis 
indicates some surface-based CAPE along the south coast that's 
helping fuel some pop-up showers. These will likely continue through 
this evening, ending around sunset. Cloud cover will linger before 
winds start to shift more NW then SW, and with the moist ground 
conditions, patches of fog may develop across southern New
England, extending beyond the usual areas in the river valleys
and other frequently foggy areas. Lows will once again be 
mostly in the 40s with dew points not far behind them.

Southwest flow closer to the surface really kicks up Saturday 
morning as the quasi-zonal flow aloft takes hold. Skies clear 
out and with the full sun along with warmer air aloft, highs 
will rise into the 70s across southern New England. Spots in the
CT Valley may also approach 80. Winds may gust between 20-25 
MPH in the afternoon. A weak shortwave passing just to our north
overnight may also bring the chance for some light showers late
Saturday night into Sunday, but not much else expected in the 
way of precipitation tomorrow. With warmer air remaining aloft 
and SW flow starting to shift more W, lows overnight Saturday 
will likely only fall into the mid to upper 50s.

KEY MESSAGE 2...Unseasonably warm temps Sun through Wed with near 
record high temps into the 90s possible Tue and/or Wed.  

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. GEFS/EPS guidance continue to 
show a building Bermuda High pressure system resulting in above to 
well above normal height fields. 

W-SW flow should push high temps into the 80s on Sun away from the 
Cape and Islands. A weak backdoor cold front may bring briefly 
cooler temps Mon...mainly on the immediate 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. 

KEY MESSAGE 3...Strong to severe thunderstorms possible by Tue with 
perhaps a better potential by Wed but a lot needs to be sorted out. 

Quite the ways out there...especially for a convective forecast. 
That being said...there are some signals for potentially strong to 
severe thunderstorms later Tue and perhaps a better chance by Wed. 
This will be dependent upon the timing of a cold front...but given 
anomalous/near record warmth the potential is there. In fact...much 
of our machine learning guidance indicates some modest severe 
weather probabilities for a Day 4-5 forecast...so this is certainly 
something to watch. 

KEY MESSAGE 4...Seasonable temperatures return by next Thu and Fri.

The long range guidance is in good agreement in the return of 
seasonable temperatures by Thu and Fri behind the mid-week cold 
front.

&&

.AVIATION /00Z SATURDAY THROUGH WEDNESDAY/...

Forecaster Confidence Levels...

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

00z TAF Update...High confidence in trends with moderate
confidence in timing. 

Lingering MVFR with some localized IFR conditions across eastern
MA will continue to improve to VFR as the evening wears along.
Most locations should be VFR by midnight...except across parts
of the Cape and Islands. However...we will need to watch for
localized patchy ground fog developing overnight in the
typically prone locations given light/calm winds and wet 
grounds from the recent rain.

Any fog patches quickly burn off by early to mid morning Sat.
Otherwise...VFR with SW wind gusts of 20 to 25 knots developing
by Saturday afternoon. Mainly VFR conditions continue Sat night
with SW winds of 5 to 15 knots and some 20-25 knot gusts 
persisting near the coast. Some LLWS possible late Sat night 
along with perhaps a brief passing shower or two.

KBOS...High confidence in trends with moderate confidence in 
timing. 

KBDL...High confidence in TAF. 

Outlook /Sunday through Wednesday/...

Sunday: VFR. Breezy. 

Sunday Night: VFR. 

Monday: VFR. Breezy. 

Monday Night: VFR. 

Tuesday through Tuesday Night: VFR. Breezy. 

Wednesday: Mainly VFR, with local IFR possible. Breezy.
Scattered SHRA, scattered TSRA.

&&

.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 brings 
elevated seas in the 4-7 ft range tonight. Winds shift more SW
tonight into Saturday, getting up to around 15 kt sustained
Saturday afternoon. Gusts to 25 kt possible then as well. Fog 
possible again tonight over the waters.

Given the continued elevated seas and increase in winds
tomorrow, SCAs have been extended through Saturday into part of
Saturday night. Winds and seas are expected to remain elevated
then, and possibly into Sunday morning.

Outlook /Sunday through Wednesday/...

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

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

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

Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Areas of seas approaching 5 ft. Scattered rain
showers, isolated thunderstorms.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 2 AM EDT Sunday for ANZ235-237-251.
     Small Craft Advisory until 4 AM EDT Sunday for ANZ250-254>256.

&&

$$

DISCUSSION...Frank/Hrencecin
AVIATION...Frank/Hrencecin
MARINE...Frank/Hrencecin

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